Free betting tools & calculators
The fast, no-nonsense calculators every value bettor reaches for — odds conversion, implied probability, fair-odds de-vigging and more. Each one runs in your browser; nothing leaves your device.
Odds → Probability
/tools/odds-to-probability
Type a price, see the implied probability instantly — and why it isn't the true chance.
Odds Converter
/tools/odds-converter
Decimal, fractional, American and implied % — edit any one, the rest recompute live.
Fair-Odds De-Vigger
/tools/fair-odds
Strip the bookmaker's margin from a market and reveal the true, de-vigged price.
Expected Value (EV)
/tools/ev-calculator
Enter your price and the fair price — see whether a bet is +EV before you stake it.
Kelly Stake
/tools/kelly-stake
Turn your edge and bankroll into a disciplined stake with full, half and quarter Kelly.
Overround / Margin
/tools/overround
Add a market's implied probabilities and read the bookmaker's overround at a glance.
Every tool here is free and unlimited. They read the bookmaker’s numbers — when you’re ready to see the true de-vigged price across 60+ bookies in real time, that’s what EVSTREAM is for.
Free tools are the start. The edge is live.
Real-time prices across every bookie, every code, de-vigged to fair odds — in one calm grid. No extensions, no desktop required.