Free Betting Calculators

Betting Odds Calculator

Convert odds between Decimal, Fractional, and American formats instantly. Also calculates implied probability from any odds.

Implied Probability Calculator

Calculate the true probability implied by bookmaker odds. Enter odds for multiple outcomes to see the total probability and bookmaker margin.

No-Vig Calculator

Remove the bookmaker's margin to find fair odds. See what the odds would be without the bookmaker's built-in profit margin.

Odds Calculator

Quick and simple odds conversion tool. Enter odds in any format and see the equivalent in all other formats, plus the implied probability percentage.

Point Spread Calculator

Convert point spreads to moneylines and implied probabilities. See what a spread means in terms of win probability and equivalent moneyline odds.

Accumulator Bet Calculator

Calculate potential returns for accumulators with multiple selections. See how combined odds multiply your potential winnings. Supports win, lose, and void outcomes.

Double Bet Calculator

Calculate returns for a double bet (2 selections). Both selections must win for the bet to pay out. Shows combined odds and potential profit.

Parlay Calculator

Calculate combined odds and payouts for multi-leg parlay bets. Popular in US sports betting. Supports win, lose, and push outcomes for each leg.

Single Bet Calculator

Enter your stake and odds to instantly see potential returns and profit. Supports Decimal, Fractional, and American odds formats.

Treble Calculator

Calculate returns for a treble bet (3 selections). All three must win. Higher risk but bigger potential rewards than doubles.

Alphabet Calculator

Calculate returns for Alphabet bets with 6 selections. An Alphabet consists of 26 bets: 2 patents, 1 yankee, and a six-fold accumulator.

Canadian Calculator

Calculate returns for Canadian (Super Yankee) bets. A Canadian is 26 bets across 5 selections: 10 doubles, 10 trebles, 5 four-folds, and 1 five-fold accumulator.

Double Stakes About (DSA) Calculator

Calculate returns for Double Stakes About bets. A DSA is a conditional any-to-come bet between 2 selections where double the stake goes on the second selection.

Flag Calculator

Calculate returns for Flag bets with 4 selections. A Flag consists of 23 bets: 6 doubles, 4 trebles, 1 four-fold accumulator, and 12 single-stakes-about (SSA) pairs.

Goliath Calculator

Calculate returns for Goliath bets. A Goliath is 247 bets across 8 selections: 28 doubles, 56 trebles, 70 four-folds, 56 five-folds, 28 six-folds, 8 seven-folds, and 1 eight-fold.

Goliath Flag Calculator

Calculate returns for Goliath Flag bets with 8 selections. A Goliath Flag consists of 303 bets: 247 system bets and 56 SSA any-to-come pairs.

Heinz Calculator

57 bets on 6 selections: 15 doubles + 20 trebles + 15 four-folds + 6 five-folds + 1 six-fold. No singles, so you need at least 2 winners for a return.

Heinz Flag Calculator

Calculate returns for Heinz Flag bets with 6 selections. A Heinz Flag consists of 87 bets: 15 doubles, 20 trebles, 15 four-folds, 6 five-folds, 1 six-fold accumulator, and 30 SSA pairs.

Lucky 15 Calculator

15 bets on 4 selections: 4 singles + 6 doubles + 4 trebles + 1 four-fold. One winner guarantees a return. Many bookies offer bonuses for all 4 winning.

Lucky 31 Calculator

31 bets on 5 selections covering all combinations from singles to five-fold. One winner guarantees a return. Popular for horse racing with consolation bonuses available.

Lucky 63 Calculator

63 bets on 6 selections: all possible combinations. Maximum coverage for 6 picks. One winner guarantees a return, with potential for huge payouts if all 6 win.

Patent Calculator

7 bets on 3 selections: 3 singles + 3 doubles + 1 treble. Just one winner guarantees a return. More coverage than a Trixie but higher total stake.

Round Robin Calculator

Creates all possible parlays from your selections. Choose 3-8 picks and see every 2-way and 3-way combination. Great for spreading risk across multiple smaller parlays.

Single Stakes About (SSA) Calculator

Calculate returns for Single Stakes About bets. An SSA is a conditional any-to-come bet between 2 selections consisting of 2 bets.

Super Flag Calculator

Calculate returns for Super Flag bets with 5 selections. A Super Flag consists of 46 bets: 10 doubles, 10 trebles, 5 four-folds, 1 five-fold accumulator, and 20 SSA pairs.

Super Heinz Calculator

120 bets on 7 selections covering all combinations except singles. The ultimate system bet for confident punters. Requires 2+ winners for any return.

Super Heinz Flag Calculator

Calculate returns for Super Heinz Flag bets with 7 selections. A Super Heinz Flag consists of 162 bets: 120 system bets and 42 SSA any-to-come pairs.

Trixie Calculator

4 bets on 3 selections: 3 doubles + 1 treble. You need at least 2 winners to get a return. Lower risk than a treble with decent returns.

Union Jack Patent Calculator

Calculate returns for Union Jack Patent bets. 9 selections in a 3×3 grid with a Patent (3 singles + 3 doubles + 1 treble) on each of the 8 lines, totaling 56 bets.

Union Jack Round Robin Calculator

Calculate returns for Union Jack Round Robin bets. 9 selections in a 3×3 grid with a Round Robin (3 doubles + 1 treble + 6 SSA) on each of the 8 lines, totaling 80 bets.

Union Jack Trebles Calculator

Calculate returns for Union Jack Trebles bets. 9 selections arranged in a 3×3 grid with 8 treble bets along rows, columns, and diagonals.

Union Jack Trixie Calculator

Calculate returns for Union Jack Trixie bets. 9 selections in a 3×3 grid with a Trixie (3 doubles + 1 treble) on each of the 8 lines, totaling 32 bets.

Yankee Calculator

11 bets on 4 selections: 6 doubles + 4 trebles + 1 four-fold. Need at least 2 winners for a return. Popular system bet with good balance of risk and reward.

Arbitrage Bet Calculator

Find guaranteed profits by betting on all outcomes across different bookmakers. Enter odds from multiple bookies to calculate stake distribution for risk-free returns.

Closing Line Value Calculator

Measure your betting edge by comparing your odds to the closing line. CLV is the best predictor of long-term betting profitability.

Dutching Calculator

Calculate optimal stakes for dutching multiple selections in the same market. Distribute your total stake to get equal returns regardless of which selection wins.

Expected Value Calculator

Determine if a bet has positive expected value (+EV). Enter odds and your estimated true probability to see if the bet is profitable long-term.

Half Point Calculator

Calculate the cost and value of buying half points on point spreads. Determine if paying extra juice to move off a key number is worth it.

Hold Calculator

Calculate the bookmaker's margin (vig/juice) on any two-way market. See implied probabilities, fair odds without the vig, and identify which bookmakers offer the best value.

Kelly Criterion Calculator

Calculate the mathematically optimal bet size based on your edge and bankroll. Maximize long-term growth while managing risk.

Strike Rate Calculator

Track your betting win percentage and compare it to the break-even rate for your average odds. Calculate ROI, edge, and average profit per bet to evaluate your performance.

Surebet Calculator

Calculate guaranteed profits from surebet opportunities. Enter odds from different bookmakers to find risk-free betting opportunities across 2-way and 3-way markets.

Win/Loss Calculator

Track your betting performance with win rate, ROI, and profit per bet. Enter your betting record to analyze your long-term results.

Each Way Calculator

Calculate returns for each-way bets. Enter your stake, odds, and place terms to see win returns, place returns, and potential profit for each-way wagers.

Hedge Bet Calculator

Lock in profit or minimize losses by betting against your original bet. Calculate the exact hedge stake for guaranteed profit.

Middle Calculator

Calculate potential profit from middle betting opportunities. Find situations where two opposing bets can both win, giving you a risk-free shot at a big payout.

Asian Handicap Calculator

Calculate Asian handicap bet outcomes. Enter the handicap, odds, and match score to determine your return for whole, half, and quarter Asian handicap bets.

Bonus Bet Conversion Calculator

Calculate how much guaranteed profit you can extract from free bets and bonus bets. Find the optimal lay stake and see your conversion rate.

Lay Bet Calculator

Calculate lay bet stakes, liability, and profit for betting exchange wagers. Find the optimal lay stake to match your back bet and see potential outcomes.

Matched Betting Calculator

Calculate optimal lay stakes for matched betting. Supports normal qualifying bets and free bets (stake returned and stake not returned) with exchange commission.

Poisson Calculator

Predict match outcomes using the Poisson distribution. Enter expected goals for each team to see probabilities for every scoreline, match result, over/under, and BTTS markets.