Win-rate confidence calculator

What does this result mean?

A poker win-rate confidence calculator places a 95% range around the BB/hr observed in your sample. The measured rate sits at the centre, while the low and high figures show how much uncertainty remains once hours and session-to-session swing are considered. If the low end crosses zero, the sample is still compatible with break-even or losing play even when the headline hourly is positive. If the whole band sits above zero, the evidence for a real edge is stronger, but it is never a guarantee about future games. The range narrows slowly as hours accumulate and assumes the entered swing rate represents the games played. Use it to label a result as early, directional or reasonably established, then keep venue, stake and game mix consistent enough that the sample still describes the decision you are making.

How to use the answer responsibly

Treat the calculator as a planning tool, not a verdict on one session. A live poker input is usually an estimate: your win rate is noisy, your standard deviation changes by game type, and your future volume rarely matches the clean number you type into a form. The useful habit is to save the assumptions beside the result so you know what would need to change before the decision changes.

If the result pushes against what you wanted to do, do not smooth the inputs until the answer feels nicer. Make the conservative version first, using a lower win rate, a higher swing rate or fewer weekly hours. Then run the optimistic version. The space between those answers is the real decision area: where a shot needs a stop rule, where a move up needs more buy-ins, or where a good-looking hourly still needs a bigger sample.

Overshove calculators become more useful when the inputs come from your own logged sessions. Rake, tips, travel, hours, stake mix and session length all change the number. A generic benchmark can teach the shape of the problem, but a clean personal log gives the number you should actually act on.