Calculate a betting ladder: the payout after a number of all-in steps at fixed decimal or American odds, or how many wins it takes to reach a target.
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
Choose the ladder payout or the steps needed to reach a target, then enter 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 $80. Each successful step rolls the entire return into the next stake.
Completion probability = entered per-leg chance^legs
Input and Example Guide
| Input or category | Example or weight | Entry guidance |
|---|---|---|
| Starting stake ($) | 10 | Use the stated unit; retain available precision. |
| Odds per step | 2.00 decimal (+100 American) | Choose decimal or American odds; the same odds apply to every step. |
| Number of steps | 3 | Use a whole count in the stated unit. |
| Win chance per step (%), optional | 50 | Leave blank to use the chance implied by the odds. |
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 marks the old result as a previous result until you calculate again. Reset clears the inputs and the saved result.
Sources
Betfair Help, Decimal Odds and Stake-Inclusive Returns, reviewed 2026. Arithmetic and scenario assumptions are specified above.
