Calculate betting ladder from your inputs, with a result breakdown and worked steps.
Betting Ladder Formula and Method
Final return = starting cash × decimal odds^legs
The modeled ladder rolls the complete winning return into each following stake at an unchanged decimal price. The all-win return is the initial stake multiplied by that price once per leg. One loss ends the sequence with no remaining return in this particular all-in model.
How to Use This Calculator
Select the result and any applicable method before entering the visible values. Check the selected record, unit and scoring conventions before calculating. Review the primary result and its breakdown, then open the calculation steps to see how the inputs were used.
Worked Example
With the example inputs in the table, the result is 80 USD. Each successful step rolls the entire return into the next stake.
Completion probability = entered per-leg chance^legs
Input and Example Guide
| Input or category | Example or weight | Entry guidance |
|---|---|---|
| Money unit | U.S. dollars (USD) | Choose the convention that applies to your record. |
| Starting cash (selected currency) | 10 | Use the stated unit; retain available precision. |
| Equal price per leg (decimal odds) | 2 | Use the stated unit; retain available precision. |
| Sequential all-in legs (count) | 3 | Use a whole count in the stated unit. |
| Assumed win probability per leg (%) | 50 | Use the stated unit; retain available precision. |
Interpreting the Result
Completion probability uses an independently entered constant chance for each leg and assumes independence. Expected net result multiplies completion chance by the final return and subtracts the initial cash. Increasing the number of legs raises the potential payout while multiplying more conditions that all must succeed.
A loss ends this all-in sequence with zero return. The probability model assumes independent equal-chance legs, unchanged odds, no withdrawals and no limits; it does not make the sequence safer than its component risks.
Assumptions and Common Input Errors
Each successful step rolls the entire return into the next stake. Keep the same currency and settlement conditions throughout a scenario. Displayed currency amounts are rounded to two decimals; calculations retain precision unless cent allocation is explicitly described.
Saving and Revising a Scenario
A successful calculation is saved in this browser and can be restored on the next visit. Editing an input clears the old result so it is not mistaken for an updated calculation. Reset returns the example inputs and clears the saved result.
Sources
Betfair Help, Decimal Odds and Stake-Inclusive Returns, reviewed 2026. Arithmetic and scenario assumptions are specified above.