Calculators / Back & back
Back/back calculator
Cover your first bookmaker bet with a back bet at a different bookmaker. We calculate the second stake so both outcomes are profitable.
The next step
in sports analysis.
Quantum Matrix World is a platform that turns advanceds statistical and quantum-inspired models into data-driven sports predictions.
Explore Quantum Matrix World
Decimal equivalents: Book 1 , Book 2 .
Back stake (Book 2)
Book 1 wins
Book 2 wins
Guaranteed outcome
How it works
A back/back pair backs the same outcome at two different bookmakers. You back at one book and back the opposite outcome at another, sizing the second bet so you profit either way.
This is useful when an event isn't available on an exchange, or when the odds difference between two books is large enough to generate profit.
Unlike back/lay on an exchange (no commission), you pay the bookmaker margin on both sides, so the odds need to be significantly different for an arb to exist.
Worked example
| Back stake (Book 1) | $50.00 |
| Back odds (Book 1) | 3.00 (+200) |
| Back odds (Book 2) | 3.10 (+210) |
| Back stake (Book 2) | $48.39 |
| If Book 1 selection wins | $100.00 |
| If Book 2 selection wins | $99.81 |
| Guaranteed profit | $49.81 |
You only see a real profit if both books accept the bets. Odds can move between placing the first and second bet.