Betting Calculators

Three calculators every bettor actually needs — stake sizing, odds conversion with implied probability, and bankroll units.

Kelly Criterion

Optimal stake when you believe you have an edge. Full Kelly is aggressive — most pros use fractional.

Odds Converter

Any format → all formats + the bookmaker's implied probability and your break-even win rate.

Bankroll Units

Split your roll into units so no single bet — or losing streak — can end you.

The theory behind the numbers
ProvablySmart covers Kelly derivations, risk of ruin and expected value in long-form guides with worked examples.

Free tools by SkinsPoint.com · 18+, play responsibly. No calculator creates an edge — they only size the risk of one.