Betting tools that tell you the truth
Free tools built on the same math we use to audit odds and tipsters. No sign-up; the calculators run in your browser.
Bet Slip Auditor
Your accumulator, audited: for the matches we cover, each leg's fair price, the margin hidden in the combined odds, and the leg that costs you most.
Fair odds calculator (devig)
Paste a 1X2 market and see the margin-free fair odds and fair probabilities (est.).
| Fair odds (power devig) | Proportional (comparison) |
|---|
Method: power devig — the same one this site has used since 18 July 2026, calibrated on 35,454 matches. It solves for the exponent that makes the probabilities sum to 1, which removes proportionally more margin from longshots. The proportional column is shown for comparison only: it spreads the margin evenly and therefore overvalues outsiders — see Longshot bias for why.
Accumulator cost calculator
See how much house edge your acca really carries as you add legs.
Every leg multiplies the bookmaker's margin. Full arithmetic in our article: Accumulator cost calculator.
Break-even win rate calculator
At your average odds, how often must you win just to not lose money?
One divided by the odds. Any advertised win rate below this number loses money at these odds — see Why win rate misleads.
CLV calculator
Compare the odds you took with the closing odds to see if you beat the market.
If the closing odds you entered still include the bookmaker margin, enter that market's margin in percent (1/odds summed over all outcomes, minus 1, times 100: for example 5.3) and we remove it proportionally. Remove it exactly with the no-vig calculator →
Why the closing line is the benchmark that can't be faked: Closing Line Value (CLV).
Free Value Bet Finder for Football — Value Alerts (beta)
A soft bookmaker price at least 5% above the devigged Pinnacle price, flagged once and scored publicly against the close. Free on Telegram during the beta.
Value Alert Simulator
Set your minimum edge and see, on live data, how many value alerts you would receive right now — then get exactly those alerts, free, on Telegram.
Audit my tipster
Paste a tipster's record — or your own betting history — and get the honest verdict: real ROI, the break-even bar, and how likely the whole record is plain luck.
Beat the closing line
Which way will the market move before kick-off? Pick and score your closing line value. Free, no money.