Yes or No Decision Maker
Type a question, set how likely a Yes should be, and let a fair random draw hand you a Yes or No answer.
%
Yes
oddsYes
50%
No
50%
How does this calculator work?
Set how likely a Yes should be, then draw a random number: if it falls below your chosen probability the answer is Yes, otherwise No. At 50% it is a fair coin flip. The chart shows the Yes-versus-No split, and every draw is independent with no memory of previous answers.
Formula
How this is calculated
You enter an optional question and the probability of a Yes as a percentage. That percentage is divided by 100 to get p, a value between 0 and 1. Values outside 0–100% are clamped, so 50% behaves exactly like a fair coin flip.
The tool draws a uniform random number u in the range [0, 1). If u is below p the answer is Yes, otherwise it is No. Because the threshold is p, the long-run frequency of Yes converges to your chosen percentage. The donut chart shows the split between the Yes chance (p) and the No chance (1 − p).
Every draw is independent and has no memory of past results, so a streak of Yeses does not change the odds of the next answer. Drawing again simply samples a fresh u; the probabilities you set stay the same. At 0% you always get No and at 100% you always get Yes.
Frequently asked questions
It uses your browser's pseudo-random generator, which is more than random enough for casual decisions, games, and tie-breaking.
Leave the probability of Yes at 50%. Then Yes and No are equally likely on every draw.
No. Each draw is independent, so the odds you set apply fresh every time regardless of what came before.
Also known as
TG we-Calculate Editorial Team. (2026). Yes or No Decision Maker [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/yes-no-decision-maker
TG we-Calculate Editorial Team. "Yes or No Decision Maker." TG we-Calculate. 2026. https://we-calculate.com/calculator/yes-no-decision-maker.
TG we-Calculate Editorial Team, "Yes or No Decision Maker," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/yes-no-decision-maker
@misc{wecalculate_yes_no_decision_maker, title = {Yes or No Decision Maker}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/yes-no-decision-maker}}, year = {2026}, note = {TG we-Calculate} }
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