Keep-Lowest Dice Roller

What this generator does

Rolls several dice and keeps only the worst result — rolling with disadvantage. The counterpart to the keep-highest roller, and the reason both exist separately is that the discarded die matters to the story at the table.

How to use this tool

1. Set the dice sides, count, and how many to keep.
2. Press roll to see every result and which were kept.

Understanding the controls

Sides per die

The size of each die. Every die in the roll is the same size, and the odds are worked out exactly for whatever you choose.

Keep lowest

How many of the rolled dice are counted. Two dice keeping one is the usual disadvantage roll.

Seed

Empty for ordinary random rolls. Type anything to replay the same sequence. Deterministic, not cryptographic.

Number of dice

How many are rolled before the lowest is taken. More dice pulls the kept result downwards.

Common use cases

• Disadvantage-style rolls
• House rules that penalise a stat
• Teaching probability with skewed outcomes

Randomness and fairness

Every die is rolled independently with your browser's cryptographic random number generator, so each face is equally likely before anything is discarded. Keeping the lowest is what makes the result unfair by design — it drags the distribution downwards and narrows it, which is the point of rolling with disadvantage. A seed replaces the generator with a deterministic, non-cryptographic one that replays the same dice from the same word, so a roll can be reproduced rather than argued about, and so it must never decide anything that has to be unguessable.

For how randomness is produced across the whole site, see how Generate Random works.