Confidence Interval Calculator
Calculate confidence intervals for your betting win rate to understand the range of your true skill level with statistical certainty.
Understanding Confidence Intervals
A confidence interval gives you a range where your true win rate likely falls. If you hit 55% in 200 bets, your true skill might be anywhere from 48% to 62% - that's the uncertainty inherent in small samples.
The key question: Is your entire confidence interval above breakeven? If so, you have statistical evidence of profitable betting. If the interval includes breakeven, you might just be running hot.
More bets = narrower intervals. That's why sample size matters so much in sports betting - you need volume to prove your edge is real.
This calculator is for informational and educational purposes only. Results should be verified with your sportsbook before placing any wagers. All betting carries risk. Full Disclaimer
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Responsible Gambling
Gambling should be entertaining, not a way to make money. Only bet what you can afford to lose, and never chase your losses.
- Betting more than you can afford to lose
- Chasing losses with bigger bets
- Lying to others about gambling habits