Free bet calculators and the latest betting system reviews
Work out returns on any bet in seconds, from a simple single to a 247 line Goliath. Then see how we rate the betting systems and services worth paying for.
Quick returns
A single bet in two seconds.
Strategies
Matched betting, value betting and tipster services we rate
Each one scored out of 10, highest first.
Check the maths before you bet
Everything here is free and built to answer one question: what's this bet worth?
Bet calculators
Singles, doubles, accas, Lucky 15s and every full cover bet. Each way and non runners included.
Calculate a bet →Odds converter
Turn fractional, decimal and American odds into each other, and into the chance of winning the bookmaker is implying.
Convert odds →Betting guides
Plain English guides to bet types, odds and strategies, with worked examples you can check yourself.
Start reading →Calculators
Most used calculators
Bet calculator
Pick your bet type, enter your odds and stake, then mark each selection as won, placed, lost or void.
Each way calculator
An each way bet is two bets of the same stake: one to win and one to place.
Odds converter
Type odds in any format into the odds converter.
Lucky 15 calculator
A Lucky 15 is 15 bets on 4 selections: 4 singles, 6 doubles, 4 trebles and 1 fourfold.
Yankee calculator
A Yankee bet is 11 bets on 4 selections: 6 doubles, 4 trebles and 1 fourfold.
Trixie calculator
A Trixie bet is 4 bets on 3 selections: 3 doubles and 1 treble.
Patent calculator
A Patent bet is 7 bets on 3 selections: 3 singles, 3 doubles and 1 treble.
Acca calculator
An accumulator, or acca, is one bet on four or more selections.
Free bet calculator
A free bet usually pays your winnings but not the stake.
Matched betting calculator
A matched bet backs a selection at a bookmaker and lays the same selection at a betting exchange.
Popular betting strategies, put through the maths
The internet is full of betting systems that promise you can't lose. We put them through the maths and show you the results, good or bad. Start with the Martingale, which says that if you double after every loss you'll always win it back. Run it 10,000 times in our simulator and see what happens.
News
Latest from the news desk
5 betting strategies that hold up, and 3 that don't
Matched betting, value betting, arbitrage, Kelly staking and bankroll rules hold up. The Martingale, chasing losses and big accas don't. Here's the maths behind each.
RacingHorse racing betting for beginners: 8 things to know before your first bet
Odds, each way bets, place terms, best odds guaranteed, Rule 4 and the popular multiples. Everything a new racing punter needs, in one place.
FootballFootball accumulator tips: 7 rules for better accas
Seven rules that make any weekend's acca better, rather than this week's picks: fewer legs, better prices, and knowing what the bookmaker's margin does to your chances.
Guides
Latest betting guides
Both teams to score (BTTS): how it's settled and priced
What BTTS means, how BTTS and win works, and how to turn expected goals into a fair price so you can tell whether the odds are any good.
Bet typesWhat is a bet builder? How bet builders are priced
Several bets on the same match rolled into one. How bet builders are priced, why they're not a normal acca, and the margin hiding in every leg.
Odds and mathsBest odds guaranteed: how BOG pays the bigger price
Take a price, and if the starting price is bigger you get paid at that instead. How BOG works, what it doesn't cover and how it mixes with Rule 4.
StrategiesWhy bookmakers restrict accounts, and what getting gubbed means
Why winning, offer taking and value betting get accounts limited, the signs it's happened, and where you can still bet.
StrategiesBankroll management: stakes that survive losing runs
How to size your stakes so a bad run doesn't end you, with the real odds of long losing runs.
StrategiesClosing line value: are you beating the market?
Why the price at the off is the best guide to the true chance, and how comparing your price with it shows skill long before results do.
Free and independent
Built for punters who like to know the numbers
Free, no sign up
Open any calculator and start typing. Nothing to download and no account.
Every bet type
From a single to a 247 line Goliath, plus matched betting, dutching, arbitrage and Kelly calculators.
No tips that promise profit
We explain how bets work. We never tell you a bet is a sure thing, because none are.
Independent
We're not a bookmaker. Commercial links never change what our calculators show.
Frequently asked questions
Is BetStrategy free?
Yes. Every calculator and guide is free, with no sign up.
Will your strategies help me win?
No strategy can promise that. We test the popular ones and show you the maths, including when a strategy loses. Most people lose money betting over time.
Are you a bookmaker?
No. We don't take bets or hold money. Some of our links are affiliate links, so we may earn a commission if you sign up with a partner. We stay independent and neutral, and our terms explain how it works.
Do the calculators include bookmaker bonuses?
No. Bonuses change between bookmakers and over time, so we show standard returns. Add any bonus your bookmaker offers on top.