Round Robin Calculator

Create a safety net for your parlays. Enter your picks to instantly see how many combinations (2s, 3s, etc.) you can create and calculate your potential returns if one leg fails.

Wes Frank
Wes FrankFounder, EdgeSlip Analytics
Updated Dec 25, 2025
Fact Checked

Round Robin Calculator

Hedge Your Parlays

Status
Leg 1
Leg 2
Leg 3

Automate this: EdgeSlip Pro automatically suggests optimal Round Robin structures for correlated parlays to smooth out your variance.

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Result Simulation

Total Payout
$109.34
Net: +$79.34(264.5% ROI)
Total Risk
$30.00
3 bets x $10
Hit Rate
3 / 3
Combinations Won
#1
Leg 1Leg 2
+$36.45
#2
Leg 1Leg 3
+$36.45
#3
Leg 2Leg 3
+$36.45

What is this tool?

A Round Robin (also known as a 'System Bet') is a strategy that breaks a larger parlay into smaller, multiple-bet combinations. Unlike a standard parlay where one loss kills the entire ticket, a Round Robin allows you to profit even if some of your selections lose. It trades maximum potential payout for higher probability of return.

How to use it

Start by adding your selections and their odds (e.g. -110, +150). Next, select your 'Bet Type'—for example, choosing 'By 2s' creates all possible 2-team parlay combinations. Then, enter your stake PER BET. Finally, use the green/red toggles to simulate results and see exactly how your payout changes if 1 or 2 legs fail.

Round Robin vs. Standard Parlay

The "All or Nothing" Parlay

You bet $30 on a 3-Leg Parlay (Teams A, B, C).

  • If A, B, C win: Big Payout
  • If A loses: Loss ($30)
The Round Robin (By 2s)

You bet $10 on three separate 2-team parlays (A+B, A+C, B+C). Total Risk: $30.

  • If A, B, C win: Win 3x Bets (Max Profit)
  • If A loses: Win 1 Bet (B+C)

Why use Round Robins?

The Round Robin is primarily a tool for variance reduction. While a massive 5-leg parlay offers a lottery-ticket payout, it has a very low probability of hitting. By breaking that 5-legger down into ten 2-leg parlays ("By 2s"), you dramatically increase your chances of getting some return on your investment.

Professional bettors often use Round Robins when they identify a group of correlated plays (e.g. betting the Over on 3 different games in similar weather conditions) or weak lines but don't want to expose their bankroll to the binary "all-or-nothing" nature of a standard parlay.

Common System Bets

The Trixie

3 Selections • 4 Bets

  • 3x Doubles (2-leg)
  • 1x Treble (3-leg)
  • Requires 2 wins to return something.

The Patent

3 Selections • 7 Bets

  • 3x Singles
  • 3x Doubles
  • 1x Treble
  • Only 1 win needed for a return.

The Yankee

4 Selections • 11 Bets

  • 6x Doubles
  • 4x Trebles
  • 1x Four-fold

The Math: Combinations

The number of bets in a Round Robin is determined by the binomial coefficient formula (nCr), which calculates how many ways you can choose k items from a set of n items.

nCr = n! / (k! * (n - k)!)

For example, if you select 5 Teams and choose to bet "By 2s":
5! / (2! * 3!) = 120 / (2 * 6) = 10 Bets.

Frequently Asked Questions

What does 'By 2s' or 'By 3s' mean?▼
This refers to the size of the parlays created. If you have 4 selections and choose 'By 2s', the calculator will create every possible combination of 2 teams (Total 6 bets). If you choose 'By 3s', it creates every combination of 3 teams (Total 4 bets).
Does the stake apply to the total or per bet?▼
In most sportsbooks (and this calculator), the stake you enter is 'Per Bet'. If you do a Round Robin on 3 teams 'By 2s' (3 bets total) and enter $10, your total risk will be $30 ($10 x 3 bets).
Is a Round Robin better than a Parlay?▼
It is safer, but not necessarily 'better' in terms of EV. It lowers your variance (swings) but also lowers your maximum potential payout compared to hitting a perfect large parlay. It is a defensive strategy designed to preserve capital.
Can I include 'singles' in my Round Robin?▼
Some sportsbooks offer a 'Patent' or 'Lucky 15' which includes single bets on each selection alongside the parlays. A standard US Round Robin usually only includes the parlay combinations (2s, 3s, etc.).
What happens if a leg pushes (ties)?▼
In most Round Robins, a push (or void) reduces the number of legs in that specific parlay combination. For example, a 3-team parlay with one push becomes a 2-team parlay. A 2-team parlay with one push becomes a straight bet. The bet is not a loss; the odds simply adjust.
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