Tools
Betting calculators, free to use and free to embed.
A suite of fast, accurate betting calculators — matched betting, arbitrage, expected value, Kelly and an odds converter — plus a live demo of the oddsmatcher. Every calculator runs entirely in your browser. Want them on your own site? Each one drops in with a single snippet, themed to your brand.
Matched betting & offers
Turn sign-up offers and free bets into locked profit — lay at the exchange, or scan the oddsmatcher.
Matched betting calculator
FreeWork out your lay stake, liability and locked profit in one place.
Open the matched betting calculator →Each-way calculator
FreeSee your return if a selection wins, places, or doesn't.
Open the each-way calculator →Oddsmatcher (demo)
DemoSee the shape of the matched feed, with sample data.
Open the oddsmatcher (demo) →Arbitrage, dutching & value
Find and size guaranteed, dutched or value bets across bookmakers.
Arbitrage calculator
FreeSplit your stake across outcomes to lock a guaranteed return.
Open the arbitrage calculator →Dutching calculator
FreeBack several selections for the same return whichever wins.
Open the dutching calculator →Expected value calculator
FreeTurn your probability estimate into expected profit and an edge.
Open the expected value calculator →Kelly stake calculator
FreeSize your stake to your edge — full, half or quarter Kelly.
Open the kelly stake calculator →Odds & analysis
Convert prices, combine selections, and read the margin baked into a market.
Odds converter
FreeDecimal, fractional, American and implied probability — instantly.
Open the odds converter →Accumulator calculator
FreeCombine your selections to see the combined odds and return.
Open the accumulator calculator →Margin & fair-odds calculator
FreeSee the margin baked into a market and the true, no-vig prices.
Open the margin & fair-odds calculator →For platforms & tipsters
Embed any tool, brand it as yours.
The calculators are framework-free and style-isolated — one <script> tag and a host element drops a fully-themed widget into any page. Pick a light, dark or transparent theme, or pass your own accent. The oddsmatcher embeds as a sandboxed widget powered by your own feed key.
18+ · Data product for licensed operators. Please gamble responsibly.
Want the live feed behind the oddsmatcher?
The calculators are free forever. When you need real, pre-matched opportunities across deep UK coverage with bet365 included, start a free trial or tell us what you're building.