Both-sides calculator
Type the price on each side. See if you come out ahead, and how much to bet at each site.
Free, no account needed. The link keeps your numbers, so you can share them.
Your prices
Example numbers. Type your own.How many results?
Odds format
The calculator splits this between the sides.
Round amounts look like normal bets. The profit moves a little, shown for each result.
Result
Ahead whoever wins
+$74.41profit
At worst about +7.44% of what you bet, whoever wins. That holds if every bet goes through at these prices.
| Result | Bet | Back | Profit |
|---|---|---|---|
| Result 1 · 45.45%+120 | $488.37 | $1,074.41 | +$74.41 |
| Result 2 · 47.62%+110 | $511.63 | $1,074.42 | +$74.42 |
- Total bet
- $1,000.00
- Chances added upUnder 100% means you come out ahead
- 93.07%
- The sites' cutBelow 0 means you come out ahead
- -6.93%
- Profit % before rounding
- +7.44%
Place the price most likely to move first: that is Bet 1. If a price changes before your last bet goes in, check it here again.
See open both-sides bets like this (no account needed)How it works
- Pick 2 results (most games) or 3 (soccer and other games with a draw), and decimal or American odds.
- Type the best price on each side, each from a different betting site, and the total you want to bet.
- Each price is a chance. If the chances add up to under 100%, you come out ahead whoever wins. The calculator splits your money so every result pays back about the same.
- Turn on rounding for amounts in $5 steps, which look like normal bets. The profit for each result is shown after rounding.
Chance = 1 / decimal oddsSum = 1 / odds A + 1 / odds B (+ 1 / odds C)Both-sides bet when the sum is under 100%Profit % = 1 / sum - 1Amount on a side = total x (1 / its odds) / sumThe sites' cut = sum - 100%Example
2.20 and 2.10 at two sites
- Site A has team 1 at 2.20 (45.45%). Site B has team 2 at 2.10 (47.62%).
- Added up: 93.07%. That is under 100%, so you come out ahead whoever wins: 7.44% profit.
- With $1,000 in total: bet $488.37 on team 1 and $511.63 on team 2.
- Either way about $1,074 comes back: about $74 profit, if both bets go through.
These are the numbers already in the calculator above.
Questions
What is a both-sides bet?
A bet on every result of one game, each at a different betting site, at prices good enough that you come out ahead whoever wins, if every bet goes through. It is also called an arb, short for arbitrage.
Can a both-sides bet lose money?
Yes. It only works if every bet goes through at the price you saw. If a price moves before your last bet, a site cancels a bet, or two sites settle the game by different rules, you can lose. Place Bet 1 first: it is the price most likely to move.
What is the sites' cut?
Each site adds a little to its prices so it wins over time. Add up the chances its prices imply: the part over 100% is its cut (also called hold or vig). Below 100% across two sites means a both-sides bet.
Why round amounts to $5?
Amounts like $488.37 look like they came from a calculator, and sites notice. Round amounts look like normal bets. The profit changes a little, and the calculator shows it for each result after rounding.
Should I type American or decimal odds?
Either. Pick the one your sites show. The calculator switches between them and keeps the same prices.
Does it work with a draw?
Yes. Choose 3 results for games with a draw, like home, draw and away in soccer. You need a bet on every result.
Learn the idea
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