Know the odds
Probability, made playable.
Expected total7
Chance2.8%
Rolls this session0
D2 roller
Roll a d2 — an online coin flip.
A two-sided die with a fair 50/50 split: 1 or 2, heads or tails, this option or that one. Instant, unbiased, and logged in the history so nobody can argue the result. No app, no sign-up.
🔥 0-day streak
ROLL CONFIGURATION1d2
Share a room and everyone sees the same rolls live — no more "did you actually roll that?"
Room
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Try 1d2 for a single flip or 3d2 for best of three.
Why a dedicated d2 roller
A d2 is the simplest die there is: two outcomes, each with an exact 50% chance. It stands in for a coin flip whenever there isn’t one to hand — settling who goes first, breaking a tie, making a genuine 50/50 call, or resolving a "flip a coin" rule in the middle of a tabletop turn. Map your two options to 1 and 2, roll once, and the result lands in the history panel where everyone can see it.
Every roll is a fresh, uniform draw in your browser — no seeding, no bias toward one side, no server round-trip. For a weighted or multi-way choice, roll a bigger die on the main roller and split the range; for a number in an arbitrary span, use the random number generator. The fairness guide covers how to verify the 50/50 split yourself.
Frequently asked questions
Is a d2 the same as a coin flip?
Yes. A d2 has two equally likely outcomes, exactly like a coin. Read 1 as heads and 2 as tails (or pick your own mapping). Each result has a fair 50% chance on every roll.
How do I roll a d2 online?
Press the roll button above or hit space — it returns 1 or 2. For several flips at once, type notation like 3d2 or 5d2 and read the individual dice.
Why use a d2 instead of an actual coin?
No coin in reach, a phone is the only thing on the table, or you want a settled record of the result in the roll history. It is also handy inside a tabletop session where a rule says "flip a coin" mid-roll and you are already using a roller.
How do I settle a tie or a 50/50 decision?
Assign each option to 1 or 2 before you roll, then roll once. For "best of three", roll 3d2 and go with whichever number shows up more often.
Do physical d2 dice exist?
Yes — usually a coin-like disc or a rounded two-sided die marked 1 and 2 — but they are uncommon. Most people simulate a d2 with a coin, or by rolling a d6 and reading 1–3 as one result and 4–6 as the other.