What is the Yes or No Generator?
The Yes or No Generator is a simple random decision maker. When you can't make up your mind, type your question, hit calculate, and let probability give you a clear answer: Yes or No. It is perfect for breaking ties, settling debates, or just having fun.
How to use it
Optionally type the question you're pondering — it will be echoed under the verdict. Then set the "Chance of Yes" slider value between 0 and 100. A value of 50 makes Yes and No equally likely (a fair coin flip). Set it higher to favour Yes, or lower to favour No. Each time you submit, a fresh random number is drawn so you may get a different answer.
The formula explained
The tool draws a uniform random number \(r\) between 0 and 1. Your chosen "Chance of Yes" percentage is converted to a probability \(p = \text{weight} \div 100\). If \(r < p\) the result is Yes; otherwise it is No. With the default weight of 50, \(p = 0.5\), so any roll below 0.5 is Yes and any roll of 0.5 or above is No — a perfectly balanced coin toss.
$$\text{Answer} = \begin{cases} \text{Yes} & \text{if } r < \dfrac{\text{Chance of Yes (\%)}}{100} \\[1em] \text{No} & \text{otherwise} \end{cases} \qquad r \sim U(0,1)$$
Worked example
Suppose you set the chance of Yes to 70%. Then \(p = 0.70\). If the random roll comes out as 0.42, since \(0.42 < 0.70\) the answer is Yes. If instead the roll were 0.88, since \(0.88 \geq 0.70\) the answer would be No. Over many runs roughly 70% of answers will be Yes.
FAQ
Is it truly random? It uses your device's pseudo-random number generator, which is more than random enough for everyday decisions and games.
Why do I get a different answer each time? A new random number is generated on every submission, so repeating the question can flip the result — just like flipping a coin again.
Can I make it always say Yes? Yes — set the chance of Yes to 100, and the generator will always return Yes (0 always returns No).
