How to use this betting tool
- Enter each value using the unit shown beside the field.
- Select Calculate to validate the inputs and update every result.
- Compare the main result with the supporting figures and read the stated limitation before using it.
#045 · Parlays & System Bets Tool
Round Robin Bet Calculator
Calculate round-robin combination count, total stake, and all-win return for equal decimal odds and equal stake per combination.
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What this tool calculates
Calculate round-robin combination count, total stake, and all-win return for equal decimal odds and equal stake per combination.
Combinations = n! ÷ (r! × (n−r)!). Each combination return = stake per combination × odds ^ r.
Inputs are processed locally in your browser. Verify market definitions and settlement terms before relying on a result.
Worked example
Five selections used in trebles create 10 combinations. At odds 2.00 and 10 per combination, total stake is 100 and the all-win return is 800.
| Check | Meaning |
|---|---|
| Inputs | Use the values described above |
| Output | Recalculate in the tool to reproduce the example |
Tips and limitations
- Use decimal points, not commas, inside number fields.
- Keep inputs from the same market, time period, and unit.
- Treat model estimates as assumptions rather than observed probabilities.
- Check operator-specific rounding and settlement rules.
FAQ
How is the round robin bet calculated?
Combinations = n! ÷ (r! × (n−r)!). Each combination return = stake per combination × odds ^ r.
Does the result include bookmaker margin?
Only when the displayed formula explicitly uses market odds. Model probabilities and projections are based solely on the values entered.
Why can my bookmaker settlement differ?
Operators may use different rounding, void, dead-heat, minimum-stake, or market settlement rules. Check the rules for the specific bet.
How much precision does the calculator use?
Calculations use JavaScript floating-point precision and are rounded only for display, normally to two or four decimal places.
Can this result predict a winning bet?
No. It calculates a mathematical scenario from your inputs and does not account for every source of uncertainty or guarantee an outcome.
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Result guide
| Measure | Use |
|---|---|
| Total stake | Primary calculated value |
| Number of combinations | Supporting cross-check |
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