Arbitrage calculator

Total stake Outcome one decimal odds Outcome two decimal odds Outcome three decimal odds, optional

Example result

Two prices of 2.10 split 100.00 into 50.00 per outcome and return 105.00.

What this calculator answers

Split one total stake over two or three mutually exclusive outcomes. The calculator shows each suggested amount, the inverse price total and the equalised return implied by the entered prices.

Formula and worked example

Formula: Inverse total = sum of 1 divided by each decimal price. Stake for outcome i = total stake times (1 divided by price i) divided by inverse total.

With 2.10 and 2.10, the inverse total is 0.95238. Splitting 100.00 equally gives 50.00 per side and a 105.00 return whichever listed side wins.

Checks before using the result

• Mixing outcomes that are not mutually exclusive.
• Using a price that is no longer available when the second stake is entered.
• Ignoring limits, void terms and settlement differences.

When the calculation does not apply

Prices can move, stakes can be voided and markets can settle differently. The calculation only describes the entered arithmetic and does not apply where outcomes do not cover the same event.

Keep the number in context

A calculator shows the arithmetic. It doesn't tell you whether the price fits your read of the outcome or your budget. Decide the stake before you enter it. Check the market rules. Keep essential money out of it entirely.

Cross-check on a second tool. The calculator hub, Overround and margin or Bankroll and staking cover the same numbers from a different angle. Same price conventions, so a decimal price in one is a decimal price in the other.

Read the guide to reading odds if you're new to the formats. Two minutes.

Reading a rounded result

Money is rounded to two decimals here. A real settlement applies its own rounding sequence, which can differ. Keep the original inputs written down if you're going to check the number later.

Unclear about an input? Find the stated market term. Don't guess. A quick sanity check: change one input by a small amount and see whether the result moves the way you expect.

That doesn't validate the market. It can flag a reversed sign, a mis-entered price format or a duplicated stake. Use the number to understand the arithmetic. It's not a reason to ignore a limit you set in advance.