For UK punters
Free bet calculators and plain English betting guides
Work out returns on any bet in seconds, from a simple single to a 247 line Goliath. Then read the guides that show what the odds mean and which strategies hold up.
Quick returns
A single bet in two seconds. Fractional, decimal or American odds all work.
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, Rule 4 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.
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.
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.
Guides
Latest betting guides
How betting odds work
What 5/2 and 3.5 mean, how to turn any price into a percentage and where the bookmaker hides its margin.
Bet typesEach way betting explained
Why a £5 each way bet costs £10, what the place terms mean and when placing still loses you money.
Bet typesMultiple bets explained: Trixie to Goliath
Every full cover bet in one table, from a 4 line Trixie to a 247 line Goliath.
Bet typesAccumulators explained
How the odds stack up in an acca, why the bookmaker loves them and how to work out your real chance of winning.
StrategiesThe Martingale strategy: what really happens
Double after every loss and you'll always win it back. That's the theory. Run it thousands of times and see what happens.
StrategiesValue betting explained
What value means in betting, why it's so hard to do and why bookmakers limit people who manage it.
Free, checked 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.
Checked maths
One tested calculation engine runs every calculator and every example in our guides.
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. We may link to bookmakers in future and earn a commission if you sign up. Our terms explain how that works.
Who writes the guides?
Steve runs the site and reviews every guide before it goes live. We check every worked example by running it through the same maths our calculators use.
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.