A round robin takes a group of selections and automatically builds every possible smaller parlay from them. Instead of one big parlay where a single loss ends everything, you get several two-team or three-team parlays from the same picks. You split your money across all of them, so a miss costs you some of the tickets, not necessarily all of them.
That sounds like extra safety, and in one narrow sense it is. It is also more money at risk in total, and every parlay inside still needs all of its own legs to win. Here is how the math works.
How a Round Robin Is Built
You choose the selections and the size of each parlay. The sportsbook then creates every combination of that size. With four selections, the common options look like this:
| Selections | Round robin type | Parlays created |
|---|---|---|
| 4 | "By 2s" (two-team parlays) | 6 |
| 4 | "By 3s" (three-team parlays) | 4 |
| 4 | "By 4s" (one four-team parlay) | 1 |
| 5 | "By 2s" | 10 |
| 5 | "By 3s" | 10 |
The count is the number of ways to choose the group size from your list. Four picks taken two at a time produce six pairs: A and B, A and C, A and D, B and C, B and D, C and D. A "by 4s" round robin is just a regular parlay, so most bettors who choose this bet type pick the smaller sizes. The menu of round robin options differs by app.
How the Stake Is Split
Round robins are priced as a set of separate parlays, each with the stake you choose. Many apps ask for the amount per parlay, and some ask for the total and divide it. Look closely at the slip, because the total risk is the per-parlay stake multiplied by the number of parlays.
For example, a $10 stake on each of six two-team parlays is $60 at risk, not $10. Keep that in mind when you compare a round robin with a single $10 parlay. A round robin is not a cheaper version of the same bet. It is a larger bet spread across more combinations.
A Worked Example With Made-Up Prices
Suppose you pick four selections at -110 each, then build a "by 2s" round robin with $10 on each of the six parlays. A two-leg parlay at -110 each pays about $26.45 in profit on a $10 stake. These are hypothetical prices and results meant to show the arithmetic, not predictions of how games will go.
| Selections that win | Parlays that hit | Profit from winners | Stake lost | Net result |
|---|---|---|---|---|
| 0 or 1 | 0 | $0.00 | $60 | -$60.00 |
| 2 | 1 | $26.45 | $50 | -$23.55 |
| 3 | 3 | $79.34 | $30 | +$49.34 |
| 4 | 6 | $158.68 | $0 | +$158.68 |
Look at the second row. Even when half of your selections win, you can finish behind, because the one parlay that hits does not cover the stakes on the other five. This is the part many people miss. A round robin softens a total wipeout, but it does not make a partial hit profitable.
What a Round Robin Does and Does Not Do
What it does
- Gives you a chance at some return if one of your picks misses.
- Lets you back several ideas without needing every one of them to win on a single ticket.
What it does not do
- It does not remove the sportsbook's margin. Each parlay carries the usual extra margin that comes with combining legs (see The House Edge Explained). See What Is a Parlay? for why parlays cost more than single bets.
- It does not guarantee a profit when some picks win. The table above shows a losing result with two winners.
- It does not let you combine legs from the same game. FanDuel's Ohio house rules, as of October 2026, say round robin selections cannot come from the same event, and may be settled as if only one selection from that event was included. For same-game combinations, see Same Game Parlays Explained.
When a Leg Pushes or Is Voided
If a selection pushes or is voided, each parlay containing it is recalculated without that leg, so a two-team parlay may become a straight bet. The details live in each sportsbook's house rules. Our explainer on pushes covers the basics, and our guide to what happens when a player does not play covers prop-related voids.
Is a Round Robin Right for You?
A round robin can make sense if you like several different bets in one weekend and want one slip to track them. It is poorly suited to someone trying to recover a loss or hunt a big payout, because the total stake grows quickly with each added selection. A few questions to ask before you build one:
- What is my total risk across all parlays, in dollars?
- Would I place each of those individual parlays on its own?
- Is this inside the amount I set aside for entertainment this month?
If the total is more than you planned to spend, shrink the stake or the number of picks. A simple rule like the 1% rule keeps the combined stake in check.
The Bottom Line
A round robin splits your picks into many smaller parlays, which means a single miss does not erase every ticket. It also means a larger total stake and a built-in margin on each parlay, and some results with partial wins still lose money. Check the total risk on the slip before you confirm, and compare it with a bet type like a teaser if you are weighing options.
Frequently Asked Questions
What is a round robin bet?
A round robin is a set of smaller parlays built from the same group of selections. For example, four picks taken two at a time make six two-team parlays.
How many bets are in a round robin?
It is the number of ways to choose the parlay size from your picks. Four picks by 2s make 6 parlays, four picks by 3s make 4, and five picks by 2s or 3s make 10.
How much does a round robin cost?
The total risk is the stake per parlay times the number of parlays. Six parlays at $10 each is $60. Always read the total stake on the slip before you confirm.
Can I lose money on a round robin even if some picks win?
Yes. With four picks by 2s, two winning picks produce only one winning parlay, and its profit may be smaller than the stakes lost on the other five.
Can I use two picks from the same game in a round robin?
Usually no. FanDuel's Ohio house rules say round robin selections cannot come from the same event, and other books have similar limits. Use a same game parlay for that.
Sources and verification: The same-event restriction and the treatment of voided or pushed legs were checked against FanDuel's published Ohio sportsbook house rules (fanduel.com/fanduel-sportsbook-house-rules-oh) in October 2026. Round robin menus differ by app. The -110 prices, stakes and results above are hypothetical arithmetic: a two-leg parlay at -110 each pays 2.6446 times the stake in profit. Ohio sports betting is regulated by the Ohio Casino Control Commission (casinocontrol.ohio.gov).
You must be 21+ and physically in Ohio to bet. Sports betting is entertainment, not a way to make money, and nothing here is a pick, a prediction or a guarantee. Only wager what you can afford to lose. If gambling stops being fun, call 1-800-GAMBLER or the Ohio Problem Gambling Helpline at 1-800-589-9966, or visit org.ohio.gov/help.
Set a Budget First
A simple monthly setup keeps multi-bet slips from taking over your spending.
Separate Betting Money From Bills →