Round Robin Calculator

How to use it

1. 1 Pick the odds format and enter odds for each selection (3 to 10).
2. 2 Choose the parlay sizes. "By 2s" means every two-pick parlay, "By 3s" every three-pick parlay, and you can select several.
3. 3 Enter the stake for each parlay. Read the number of parlays, total stake, maximum return and what you get back if exactly one pick loses.

How a round robin works

A round robin bets every combination of your picks at the sizes you choose. Four picks played "by 2s" make 6 two-pick parlays. Played "by 2s and 3s" they make 6 two-pick parlays and 4 three-pick parlays, 10 in all. The number of parlays of size k from N picks is N choose k.

You stake the same amount on each parlay, so the total stake is the number of parlays times that amount. This is the main cost: more sizes means many more bets.

What you get back when picks lose

The maximum return is what you collect when every pick wins, which pays every parlay. If exactly one pick loses, every parlay that contains it loses and only the parlays without it pay. The calculator tries each pick as the loser and reports the worst and the best case.

A round robin does not remove risk. It spreads it, and it can still lose money when a loss leaves too few winning parlays to cover the total stake. The results assume each pick either wins or loses cleanly, with no pushes.

Worked example

Four picks at -110, +150, -120 and +100, played by 2s with $10 on each parlay. That is 6 parlays and a $60.00 total stake.

If all four win, the six parlays return $253.41 in total, a profit of $193.41. If only the +150 pick loses, three parlays still pay and return $109.85, a profit of $49.85, the worst single-loss case. If only the -120 pick loses, you get back $135.91, a profit of $75.91, the best single-loss case.

The formula

Frequently asked questions