How to use the coin flip and dice roller
Use the coin section when you need a simple heads-or-tails decision. Choose one flip for a quick answer, or flip multiple times when you want to see a small pattern of outcomes. Use the dice section for tabletop games, classroom probability examples, party games, or quick random scoring. Pick the number of dice, choose the die size, and add a modifier if your game rule needs one.
For quick decisions, one fair coin flip is usually enough. For games, the dice result is often more useful because it gives a number, a total, and individual die values. If you are following a tabletop rule, enter the dice exactly as the rule describes before adding any modifier.
What dice notation means
Dice notation is usually written as NdS, where N is the number of dice and S is the number of sides on each die. For example, 2d6 means two six-sided dice. If you add a modifier, 2d6+3 means roll two six-sided dice and add three to the total.
The total range changes with both the number of dice and the number of sides. One d20 can produce any number from 1 to 20. Two d6 can produce totals from 2 to 12, but middle totals are more common because there are more ways to roll them.
Fair coin vs custom coin
The fair coin option uses an equal 50 percent chance for heads and tails. The custom option is useful for demonstrations, probability lessons, or game variants where the outcome is intentionally weighted. For ordinary decisions, the fair coin setting is the cleanest choice.
Randomizer
Single-result chance
Example use
Fair coin
50% heads, 50% tails
Low-stakes either-or decisions.
One d6
1 in 6 for each face
Board games and classroom probability.
One d20
1 in 20 for each face
Tabletop checks and random tables.
When not to use a browser randomizer
This page is built for casual decisions and games. Do not use it for raffles with legal requirements, security tokens, cryptographic keys, official gambling, compliance-sensitive drawings, or anything that needs an audited random process. For those cases, use a purpose-built system with documented controls.
Also avoid using a coin flip as a way to dodge conversations or consent. If a choice affects another person, the fairer tool is usually discussion, not randomness. Randomizers are best when every possible outcome is already acceptable.
Coin and dice FAQ
Can I roll custom dice? Yes. Choose custom sides when you need a die that is not one of the common presets.
Why do two dice feel less evenly spread than one die? With multiple dice, totals near the middle can be made in more combinations, so they appear more often over many rolls.
