Sports betting calculators
Four utilities for North American sports bettors: parlay payout, expected value, Kelly stake sizing and hedge calculator. Plain math, no signup, no email — the same formulas the NotaSportsGuru model uses to price every published leg.
Combine up to 10 legs in American or decimal odds. See the combined decimal, the implied probability, and the payout on any stake.
Enter the line you got and your own win probability. See the +EV (or −EV) edge per $100 stake and the bookmaker's vig-implied break-even.
Convert your edge into the mathematically optimal bankroll fraction. Full Kelly, half Kelly and quarter Kelly stakes — no spreadsheet needed.
Already have a live ticket? Plug in the opposing odds to see the hedge stake that locks in guaranteed profit on both sides.
Want the model that picks the +EV bets?
Members get the daily Parlay of the Day plus every positive-expected-value pick the NotaSportsGuru model generates across NBA, MLB and NHL. By application only.