Tools // free, no account needed
Betting calculators
Convert odds, work out accumulator payouts, and size your stake sensibly. Everything runs in your browser — nothing you type here is sent anywhere.
Odds converter
Decimal · Fractional · American
Type into any field — the other two update instantly.
Accumulator
Parlay payout
Add each leg's decimal odds — one per line.
Stake size
Fractional Kelly
Sizes a stake from your edge — never your gut. Defaults to quarter-Kelly, the conservative choice.
If the edge is negative, the suggested stake is €0 — there's no value, so don't bet it.
These are calculators, not guarantees
Odds and payouts assume the prices you enter; always confirm the live price on the operator's site before betting. The Kelly calculator sizes a stake from a probability you supply — it's only as good as that estimate, and won't turn a losing edge into a winning one. Betting involves real financial risk. 18+ · never stake more than you can afford to lose.