Value Calc

Value Calc helps sports bettors and prediction market traders make smarter staking decisions using rigorous mathematical methods. It is a free, simple calculator with no tracking or login, and includes a few links for more information or future research. All serious pro bettors have those functionalities baked directly into their automated models, but it can be handy for quick calculations on the fly and as an educational starting point for curious, math-savvy people interested in the world of betting and probabilities.

KELLY CRITERION
Calculate your optimal bet size. Enter your estimated win probability and the odds offered — the Kelly Criterion formula calculates exactly what fraction of your bankroll to stake to maximise long-term capital growth. Supports full, half, and quarter Kelly to manage variance.

TRUE PRICE
Remove the bookmaker's margin from any set of odds to reveal the true underlying probabilities. Supports 2 to 20 outcomes. Choose between the Optimal method for accurate results or the Normal method for comparison.

ODDS CONVERTER
Instantly convert between decimal, fractional, American moneyline, and implied probability (prediction market) formats.

KEY FEATURES
• All calculations run locally — no internet connection required
• No accounts, no tracking, no ads
• Inputs saved automatically between sessions
• Dark, light, and auto themes
• Explanations, math, and examples behind every calculator
• Source links for future reading or study of the subjects covered

This app is a calculation tool only. It does not facilitate, encourage, or enable gambling. Please gamble responsibly.