Number Generators
205 tools
Generate random numbers for raffles, statistics, games, sampling or everyday decisions. Set a range, choose how many numbers you need, and control duplicates and sorting.
Showing 205 of 205 tools.
- Random Number GeneratorGenerate one or many random numbers within any range, with optional duplicate control and sorting.
- Magic Square GeneratorBuilds a genuine magic square of any size — every row, column and diagonal summing to the constant the size forces.
- Random Date GeneratorGenerate one or more random calendar dates within a chosen range, with weekday or weekend filters.
- Hex Color GeneratorA colour shown as its hex code, with a live swatch preview.
- Unique Random Number GeneratorGenerate a batch of random numbers with no repeats — every number in the set is different.
- Random Decimal GeneratorGenerate random decimal numbers within any range, with control over decimal places.
- RGB Color GeneratorA colour shown as its rgb() value, with a live swatch preview.
- Random Percentage GeneratorGenerate one or more random percentages between 0% and 100%, or any custom range.
- Random Even Number GeneratorGenerate random even numbers within any range.
- Random Coordinate GeneratorA latitude/longitude coordinate, uniformly distributed across the globe — could land anywhere, ocean included.
- Random Fraction GeneratorA proper fraction, automatically simplified to its lowest terms, with its decimal equivalent shown.
- Random Odd Number GeneratorGenerate random odd numbers within any range.
- HSL Color GeneratorA colour shown as its hsl() value, with a live swatch preview.
- Random Negative Number GeneratorGenerate random negative numbers within any range.
- Base64 String GeneratorA Base64-encoded token built from cryptographically secure random bytes, for testing or placeholder data.
- Random Prime Number GeneratorA prime number within a range you choose, verified prime rather than just plausible-looking.
- Random Binary Number GeneratorA number shown in binary, alongside its decimal value for reference.
- Random Hex Number GeneratorA number shown in hexadecimal, alongside its decimal value for reference.
- Roman Numeral GeneratorA number converted to Roman numerals, alongside the original figure.
- Random Temperature GeneratorA temperature value in degrees Celsius, across an everyday weather range.
- Random MAC Address GeneratorA locally-administered MAC address for testing or placeholder data.
- Random IP Address GeneratorAn IPv4 address for test data or placeholder configs.
- Random Compass Direction GeneratorA point on a 16-point compass, from North to North-northwest.
- Random Currency Amount GeneratorA monetary amount with a common currency symbol, to two decimal places.
- Random Date Range GeneratorA start and end date pair, 3 to 30 days apart.
- Random Angle GeneratorAn angle in decimal degrees, from 0 up to (but not including) 360°.
- Random Century GeneratorA century, from the 16th to the 22nd, with its year range.
- Random Decade GeneratorA decade label, from the 1920s to the 2020s.
- Random Binary String GeneratorA string of 0s and 1s of a fixed length — not a converted number.
- Random Hex String GeneratorA string of hexadecimal characters of a fixed length — not a converted number.
- ISBN Example GeneratorAn ISBN-13-shaped example number with a correct check digit, for test data that has to pass validation.
- Random Duration GeneratorA random length of time, formatted as hours, minutes and seconds.
- Random Timestamp GeneratorA random ISO-8601 timestamp between 2020 and 2030, for test data or placeholders.
- Random Fibonacci Number GeneratorA random number from the Fibonacci sequence, with its position shown.
- Random Decimal Range GeneratorA random decimal number within a range you choose.
- Barcode Number Example GeneratorA 12-digit UPC-A-shaped example number with a correct check digit — not a real, assigned barcode.
- Random Sequence GeneratorA random arithmetic number sequence with a random start value and step.
- Weighted Random Number GeneratorA random number from your range, deliberately skewed toward the lower end.
- Random Time of Day GeneratorA random 24-hour time, HH:MM.
- Random Date & Time GeneratorA friendly random date and time, e.g. '14 March 2027, 3:45pm'.
- Random Matrix GeneratorA random 3x3 grid of numbers, for maths practice or placeholder data.
- Random Multiple Of GeneratorA random multiple of any base number you choose.
- Random Perfect Square GeneratorA random perfect square (n²) between 1 and 900, with its root shown.
- Random Signed Decimal GeneratorA random decimal that can be positive or negative.
- Random Fraction Range GeneratorA random fraction with numerator and denominator each up to 20.
- Ratio GeneratorA random ratio in the form a:b, unsimplified.
- Random 3D Coordinate GeneratorA random three-dimensional (x, y, z) coordinate point.
- Composite Number GeneratorA random composite (non-prime) number within your chosen range.
- Factor GeneratorA random number shown with its complete list of factors.
- Geometric Sequence GeneratorA random geometric sequence with a whole-number ratio.
- Percentage Split GeneratorSplits 100% into three random parts that always add up correctly.
- Probability GeneratorA random '1 in N' probability statement with its equivalent percentage.
- Random Percentile GeneratorA random percentile rank between the 1st and 99th.
- Random Scientific Notation GeneratorA random number formatted in scientific notation, e.g. 4.82 × 10^7.
- Random Angle Set GeneratorA set of three random angles in whole degrees.
- Vector GeneratorA random 2D vector with its magnitude shown.
- Octal Number GeneratorA random number shown in octal (base 8), alongside its decimal value.
- Checksum Test Number GeneratorA fictional, mod-10-checksum-valid test number, for testing validation code.
- Integer Partition GeneratorA random way to split a small number into positive whole-number parts.
- Normal Distribution Sample GeneratorA random sample from a normal (bell-curve) distribution, mean 50.
Counting & probability
- Permutation and Combination CalculatornPr and nCr side by side, exactly, with the difference between them worked through rather than assumed.
- Random Sample GeneratorDraw a sample without replacement from your own list, and see exactly how many different samples were possible.
- Expected Value CalculatorThe long-run average of a set of weighted outcomes, with the variance beside it — and a note when the average is a result you can never get.
- Card Draw Probability CalculatorExact odds of drawing what you need from a deck, bag or pool — without replacement, which is the part people get wrong.
- Law of Large Numbers SimulatorRuns thousands of trials and shows the proportion settling while the raw gap between heads and tails grows.
- Coin Run Probability CalculatorHow likely a streak of heads really is — counted exactly across every possible sequence, then simulated so you can watch the two agree.
- Weighted Draw SimulatorDraws from options with different weights, and shows what you got beside what the weights predicted.
- Birthday Problem CalculatorHow many people before a shared birthday becomes likely — and the same arithmetic for IDs, codes and hashes.
- Random Partition GeneratorSplits a whole number into random parts that add back up to it exactly, with no part rounded away.
- Bootstrap Sample GeneratorResamples your own numbers with replacement to show how much the average would move if you had collected a different sample.
- Random Walk SimulatorTakes a walk one coin flip at a time, draws the path, and says exactly how unusual the finish was.
- Survey Sample Size CalculatorHow many people you need to ask for a given margin of error, including the finite population correction most calculators leave out.
- Confidence Interval CalculatorTurn a count out of a sample into an interval, with a warning when the sample is too small for the usual approximation to be trusted.
- Bayes Update CalculatorWork out what a positive test actually means, using natural frequencies as well as probability — the calculation almost everyone gets wrong.
- Markov Chain SimulatorDefine states and transition probabilities, then simulate — with a long-run distribution quoted only when the chain genuinely has one.
- Sampling Distribution SimulatorTake a sample, take its mean, repeat — and watch means from even a badly skewed population pile up symmetrically.
- Binomial Experiment SimulatorRepeat a fixed run of trials thousands of times and watch the count of successes form its distribution, with theory shown beside it.
- Poisson Process SimulatorSimulate counts of independent events per interval and see why a Poisson process cannot have a tidy, narrow spread.
- Unit ConverterConverts length, weight, volume, area, speed, time, data and temperature, with the exact defined factors and every unit shown at once.
- Age CalculatorWorks out an age in years, months and days, and proves it by adding the answer back onto the birth date.
- Monty Hall SimulatorPlay the switch-or-stay problem a door at a time, or run it thousands of times with the exact theory and the observed rate reported separately.
- Roman Numeral ConverterConverts numbers to Roman numerals and back, refusing forms like IIII that read correctly but are not how the number is written.
- Secretary Problem CalculatorHow many candidates to see before choosing, and how often that lands you on the very best one.
- Coupon Collector SimulatorHow many random draws it takes to collect a full set, against the exact harmonic-number expectation.
- Gambler's Ruin SimulatorA bounded random walk between zero and a target, with the exact ruin probability alongside the observed one.
- Fair Results From a Crooked CoinTurns a coin that lands heads far more often than tails into perfectly even results, and shows the flips it discarded.
- Counterfeit Coin Weighing PlannerA plan for finding one odd coin among twelve in three weighings, with every case checked to give a different result.
- Prime Gap GeneratorRuns of consecutive primes with the gap after each, twin pairs highlighted and every gap proved to contain no prime.
- Balls in Bins SimulatorRandom allocation is far lumpier than it looks: the fullest bin against the even share, and empty bins against the exact formula.
- Parrondo's Paradox CalculatorTwo games that each lose money, and the alternation between them that wins — worked out exactly rather than simulated.
- Golomb Ruler GeneratorThe shortest ruler with a given number of marks on which no distance can be measured twice.
- Graeco-Latin Square GeneratorTwo Latin squares laid over each other so that every combination of symbols appears exactly once — impossible at six, as Euler found.
- Coprime Number GeneratorPairs sharing no factor beyond one, with a non-coprime counterexample and Euler's totient counted directly.
- Chinese Remainder Challenge GeneratorSystems of congruences with pairwise coprime moduli and the unique solution below their product, substituted back into every one.
- Recurrence Relation GeneratorLinear recurrences with their terms computed forward and the ratio of consecutive terms, which settles towards the characteristic root.
- Negative Binomial SimulatorHow many attempts it takes to reach a target number of successes, against the exact expectation of successes over probability.
- Positive Definite Matrix GeneratorMatrices built to be positive definite and proved so twice — by Cholesky decomposition and by Sylvester's criterion.
- Stochastic Matrix GeneratorTransition matrices whose rows sum to exactly one, kept as integers over a common denominator so no rounding creeps in.
- Derangement GeneratorPermutations that leave nothing in its original place, counted by enumeration and by recurrence and required to agree.
- A/B Test Significance CalculatorRuns a two-proportion test on your conversion counts and is plain about what the p-value does and does not mean.
- Diophantine Equation GeneratorLinear equations in two unknowns over the integers, with the solvability test, a table of the solution family and the smallest non-negative answer.
- Set Partition GeneratorEvery way of splitting a small set into unlabelled groups, counted against the Bell number and broken down by group count.
- Symmetric Matrix GeneratorMatrices that equal their own transpose, with the trace, determinant and the count of entries that are actually free.
- Integer Composition GeneratorEvery ordered way to write a number as a sum, counted by enumeration and by the two-to-the-power formula.
- Statistical Power CalculatorWorks out the chance a test would detect a real effect of a given size, and how many people it would take to reach the usual eighty per cent.
- Simpson's Paradox GeneratorBuilds a table where one side wins every subgroup and loses overall, with the reversal verified group by group.
- Benford's Law CheckerCompares the leading digits of your numbers against Benford's law with a chi-square test, and is clear about what a poor fit does not prove.
Puzzles & challenges
- Logic Grid Puzzle GeneratorZebra-style puzzles where clues are sentences about who goes with what, every clue proved necessary and exactly one arrangement possible.
- Futoshiki GeneratorA Latin square solved from greater-than signs rather than given digits, with every clue proved necessary and exactly one answer.
- Codebreaker Puzzle GeneratorA hidden code with worked feedback examples, using the exact-then-misplaced scoring rule that most implementations get wrong.
- Train Track Puzzle GeneratorLay one line of rails from the entrance to the exit, matching the total beside every row and column — up to twenty-four at a time, ready to print as a booklet.
- Skyscraper Puzzle GeneratorA grid solved entirely from counts around the edge saying how many buildings are visible from each direction, with exactly one answer.
- Cryptarithm GeneratorSEND + MORE = MONEY puzzles where each letter stands for a different digit, every one solved and proved to have a single answer.
- Missing Operator Puzzle GeneratorThe numbers are given and the signs are blank: work out which combination of plus, minus and times reaches the target.
- Dominosa Puzzle GeneratorPrints a Dominosa grid — a whole domino set laid out with the boundaries rubbed out — with exactly one way to put the boundaries back.
- Suguru Puzzle GeneratorPrints a Suguru — also called Tectonic — where each region holds 1 up to its size and no two equal numbers touch, with exactly one answer.
- Travelling Salesman Problem GeneratorTour instances on random coordinates, solved exactly by Held-Karp, with the nearest-neighbour tour shown for comparison.
- Number Path Puzzle GeneratorPrints a grid to fill with 1 up to the number of squares, each number touching the next, with exactly one way to complete it.
- KenKen GeneratorArithmetic-cage puzzles on a Latin square, every one solved exhaustively to prove it has exactly one answer.
- Mosaic Puzzle GeneratorPrints a Mosaic, where each number counts the shaded squares in its own block of nine, with exactly one answer.
- Pipe Network Puzzle GeneratorPrints a grid of pipe pieces to be turned until they join into one network with no loop in it — and every grid is checked to have exactly one answer.
- Truth Table GeneratorThe full truth table for an expression you type — or one drawn for you — with the grouping shown fully bracketed and a tautology or contradiction verdict counted from the rows.
- Knapsack Problem Generator0/1 knapsack instances solved exactly by dynamic programming, with the value-per-weight answer shown alongside for comparison.
- Game of Life Pattern GeneratorRandom Life soups run until they settle, reporting whether they died, froze, or fell into a cycle — and the exact period.
- Shortest Path GeneratorWeighted graphs with Dijkstra's shortest route, verified by the relaxation condition rather than by trusting the code.
- Kakurasu Puzzle GeneratorPrints a Kakurasu grid where a square's value is its position, with row and column totals that lead to exactly one shading.
- Aquarium Puzzle GeneratorPrints an Aquarium puzzle — a grid of tanks where water finds its own level — with row and column counts that lead to exactly one arrangement.
- Minimum Spanning Tree GeneratorWeighted graphs with the cheapest spanning tree found by Kruskal and, at small sizes, confirmed against every other spanning tree.
- Flow Network GeneratorCapacitated networks with the maximum flow found by Edmonds-Karp and the minimum cut that proves it cannot be beaten.
- Bipartite Matching GeneratorPeople-to-slots problems solved to the largest possible matching, with the answer proved by building a minimum cover of the same size.
- Slitherlink Puzzle GeneratorPrintable Slitherlink loop puzzles with every clue proved necessary and exactly one closed loop satisfying them.
- Slant Puzzle GeneratorPrints a Slant puzzle — one diagonal in every square, numbers counting the ends at each corner, and no closed loop — with exactly one answer.
- Thermometer Puzzle GeneratorPrints a thermometer logic puzzle — mercury rises from each bulb without a gap, and the row and column totals say how far — with exactly one answer.
- Bin Packing Problem GeneratorPacking instances with bins of one size or several at different prices, each with an answer, a lower bound, and a plain statement of when the two meet.
- Shikaku Puzzle GeneratorCut the grid into rectangles, one number in each, that number being its area — with the single answer proved before you see it.
- Graph Colouring Challenge GeneratorColour the nodes so no edge has one colour at both ends, with the greedy answer and — at small sizes — a proof that fewer colours are impossible.
- Euler Path GeneratorTrails that use every edge exactly once, with the odd-degree count that decides whether one can exist at all.
- Topological Order GeneratorDependency graphs with a valid task order, every edge checked to point forwards and the number of alternative orders counted exactly.
- Nash Equilibrium GeneratorPayoff grids with every pure equilibrium found by testing each cell against every alternative for both players.
- Number Block Puzzle GeneratorPrints a number block puzzle — every number says how many squares its own block holds — with exactly one answer and a size range chosen by measurement.
- Makespan Scheduling Problem GeneratorJobs across identical machines, scheduled longest-first, with two lower bounds that often prove the schedule optimal.
- Hitori Puzzle GeneratorShade out the repeats without letting two shaded cells touch or the rest come apart, with a single answer proved by construction and by search.
- Bipartite Graph GeneratorGraphs split into two sides with every edge crossing, or a graph that cannot be — with the odd cycle that proves it.
- Graph Traversal GeneratorThe same graph visited breadth-first and depth-first side by side, with the hop count each node sits at.
- Graph Centrality CalculatorDegree, closeness and betweenness for every node of a random network, each recomputed from scratch by breadth-first search before it is shown.
- Bridges Puzzle GeneratorHashiwokakero island puzzles where bridges never cross and every island ends up connected, with exactly one valid layout.
- Star Battle Puzzle GeneratorStar Battle grids with one star per row, column and region, no two touching — with the region shapes proved to admit only one arrangement.
- Pearl Loop Puzzle GeneratorPrints a pearl loop puzzle — one closed circuit obeying every white and black pearl it passes through — with exactly one answer.
- Logic Simplification Challenge GeneratorDeliberately over-complicated expressions built by applying an identity backwards, with the law named and equivalence proved on every assignment.
- Elementary Cellular Automaton GeneratorAll 256 one-dimensional rules, run from a single cell or from noise, with the rule number decoded into its eight outputs.
- Articulation Point GeneratorConnected graphs with their cut vertices found by depth-first search and confirmed by actually removing each node and counting the pieces.
- Tents and Trees Puzzle GeneratorTents-and-trees grids where every tree pairs with its own tent, no two tents touch, and the pairing is verified as a perfect matching.
- Dominant Strategy GeneratorGames solved by repeatedly removing strategies that are worse whatever the opponent does, with each removal recorded against the options still in play.
- Consecutive Run Puzzle GeneratorBlack squares break each line into runs, every run holds consecutive numbers in any order, and no line repeats a number — each grid checked to have one answer.
- Karnaugh Map Challenge GeneratorGrey-coded Karnaugh maps filled from a real expression, with the largest valid groups found and each one proved to cover only true cells.
- Hamiltonian Path Challenge GeneratorGraphs where the puzzle is to visit every node exactly once, with every such path counted by exhaustive search.
- Graph Bridge FinderGraphs with their bridges identified — the edges that lie on no cycle — each one confirmed by deleting it and counting the pieces.
- Strongly Connected Components GeneratorDirected graphs partitioned into strongly connected components by Kosaraju, checked against mutual reachability computed from every node.
- Strip Packing GeneratorRectangles packed into a fixed-width strip with no overlaps, measured against the height no packing could beat.
- Continued Fraction GeneratorExpands any fraction into its continued fraction and lists the convergents, each proved to be the best approximation for its denominator.
- Best Rational Approximation GeneratorFinds the closest fraction to a decimal within a denominator limit, proved by testing every denominator up to that limit.
- Repeating Decimal GeneratorTurns a fraction into its decimal expansion with the repeating block marked, and checks the period against the multiplicative order of ten.
- Degree Sequence GeneratorDegree sequences tested for whether any simple graph can have them, with Havel–Hakimi shown step by step and the built graph's degrees recounted.
- Set Cover Problem GeneratorCoverage problems where greedy selection is compared against the true minimum found by exhaustive search, so the cost of approximation is visible.
- Guillotine Cutting GeneratorSheet layouts reachable only by edge-to-edge cuts, which is the constraint a panel saw actually imposes.
- Traffic Flow SimulatorCars on a ring road move only into empty space, showing that a jam above half density is a property of the road rather than of any driver.
- Egyptian Fraction GeneratorExpands a fraction into distinct unit fractions by the greedy method, added back up in exact big integers to prove the sum.
- Farey Sequence GeneratorLists every fraction between 0 and 1 with a bounded denominator, in order, with the neighbour identity checked on every consecutive pair.
- Expression Notation GeneratorShows one arithmetic expression in infix, prefix and postfix, with all three evaluated separately and required to agree.
- Cash Denomination Breakdown GeneratorBreaks an amount into notes and coins using the fewest pieces, proved against every alternative by dynamic programming.
Business & professional
- Appliance Running Cost CalculatorTurns watts into units and units into pounds for any appliance, keeps the standing charge separate, and works out how long a more efficient replacement takes to pay for itself.
- Battery Life and Cable Drop CalculatorWorks out how long a battery really lasts in watt-hours rather than milliamp-hours, and how much voltage a cable run loses on the way.
- Economic Order Quantity CalculatorThe order quantity that minimises total inventory cost, shown with the cost either side so the minimum can be seen rather than taken on trust.
- Reorder Point CalculatorThe stock level at which to reorder, splitting lead-time demand from safety stock and showing why safety stock grows with the square root of lead time.
- Flow Shop Schedule GeneratorTwo-machine job sequencing solved by Johnson's rule, confirmed against every possible order — a rare case where a simple rule is provably optimal.
- Newsvendor Problem GeneratorSingle-period stocking problems where every candidate quantity is evaluated against every demand outcome, so the best one is found rather than approximated.
- Transportation Problem GeneratorBalanced supply-and-demand shipping problems solved by the least-cost rule, with exhaustive search saying honestly whether that answer was optimal.
- Facility Location GeneratorWhere to place a few facilities among many demand points, solved greedily and compared against every possible combination.
Coordinates & geometry
- Tyre Size Comparison CalculatorCompares two tyre sizes: overall diameter, rolling circumference, ride height and what the speedometer will really be reading.
- Screen Size Comparison CalculatorTurns a screen's diagonal and shape into a real width, height and picture area, and compares two screens properly — by area, not by diagonal.
- Towing Weight CheckerChecks a car and trailer against all four limits at once — towing capacity, towball, gross train weight and noseweight — and shows the arithmetic for each.
- Aquarium Volume CalculatorWorks out how much water a tank really holds once the glass, the gravel and the freeboard are taken off, and what a water change comes to.
- Bolt Circle CalculatorMarks out equally spaced holes round a circle: the divider setting between them, the angle of each, and its position across and up from the centre.
- Random Point in Radius GeneratorCoordinates spread evenly over the area inside a radius, not bunched at the centre, and placed on a sphere rather than a flat grid.
- Voronoi Diagram GeneratorRegions of nearest-site ownership drawn by sampling, with every checked cell verified against every site and the region shares reported.
- Point Cloud GeneratorClustered two-dimensional points with the cluster labels kept, and the within-cluster and between-cluster distances measured.
- Random Triangle GeneratorTriangles with sides, angles and area computed from the coordinates, and no slivers — every angle is at least 15 degrees.
- Planar Graph GeneratorDraws a random graph that can be laid out with straight lines and no edge crossing another, with the drawing to prove it.
- Poisson Disc Point GeneratorPoints with a guaranteed minimum separation, placed by Bridson's algorithm and measured against a uniform scatter of the same size.
- Random Polygon GeneratorSimple polygons that never cross themselves, with the shoelace area, the perimeter and a convexity check.
- Non-Planar Graph GeneratorA graph that cannot be drawn without an edge crossing, together with the K5 or K3,3 hiding inside it that proves it — a proof you can walk by hand.
- Convex Hull GeneratorRandom points with the smallest convex boundary around them, every point checked to lie on or inside it.
- Delaunay Triangulation GeneratorTriangulations where no triangle's circumcircle contains another point, tested triple by triple, with the smallest angle reported.
- Orthogonal Vector GeneratorWhole-number vectors that are exactly perpendicular, with every pairwise dot product shown as the integer zero it is.
Statistics & probability
- ANOVA Dataset GeneratorGrouped data with a known separation, and the full ANOVA table whose sums of squares are checked to split exactly.
- Permutation Test GeneratorTwo-group data with an exact permutation p-value, computed by trying every possible rearrangement of the labels rather than assuming a distribution.
- Rounding Bias DemonstratorThousands of values rounded two ways, measuring how far each method drifts the total from the truth.
- Autocorrelated Series GeneratorTime series with a chosen serial correlation, showing the measured lag-1 correlation against the process value and what differencing does to it.
- Multivariate Normal GeneratorCorrelated multi-column samples built by Cholesky factorisation, with the factor proved to reproduce the requested covariance exactly.
- Branching Process SimulatorPopulation lines that either die out or grow without bound, with the exact extinction probability solved from the process's own equation.
- Interval Arithmetic GeneratorArithmetic on ranges rather than numbers, with thousands of sampled points confirming the true answer always lands inside.
- Changepoint Dataset GeneratorSeries containing a level shift at a known point, with the split independently recovered by minimising within-segment error.
- Heteroskedastic Data GeneratorRegression data whose noise grows with x, with the fitted slope and the residual spread at each end measured and compared.
- Condition Number GeneratorLinear systems with their condition number computed exactly, showing how far a tiny change to the inputs can move the answer.
- Time-to-Event Dataset GeneratorReliability-style lifetimes with right-censoring at a horizon you set, showing how badly a plain average of completed rows underestimates the truth.
Choosing the right numbers tool
Random numbers with control over range, quantity, duplicates and sorting. Ranges are inclusive at both ends throughout, and every value in a range is equally likely — the conversion from raw randomness into a range uses rejection sampling rather than the modulo shortcut, which quietly favours lower values.
- Random Number Generator
- The general case: set a range, pick how many numbers, and decide whether repeats are allowed.
- Unique Random Number Generator
- You need every number in the set to be different, without having to remember to turn duplicates off.
- Specialised number tools
- You want a particular shape of number — even, odd, negative, decimal, percentage or fraction — without configuring the general tool.
Every tool in this category draws its results in your browser. How Generate Random works explains how the randomness is produced and what happens to anything you type in.