Bookmaker payout percentage: what it is and how to work it out
The payout percentage is the average share of stakes that a market's prices hand back. Add 1 divided by each decimal price, then divide 100 by that total. Prices of 1.80 and 2.00 total 1.0556, so the payout is 94.74% and KES 52.63 of every KES 1,000 staked is kept.
What the payout percentage is
A payout percentage describes how much of the money staked on a market comes back to bettors on average. A payout of 95% means KES 95 returned for every KES 100 staked, and KES 5 kept. You never see it printed next to a bet, but it can be worked out from the prices alone, and the margin calculator does the arithmetic for you.
The word "payout" is also used for the money a single winning bet returns. That is a different thing. The payout percentage belongs to a whole market, not to one bet.
The formula
D1 to Dn are the decimal odds of every outcome in one market, and S is the total of their implied probabilities. If the prices carried no charge, S would be exactly 1 and the payout would be 100%. Each implied probability is explained in the guide on converting betting odds into probability.
Why 100 divided by S works
Suppose you stake money on every outcome in proportion to its implied probability, so that you stake 1 ÷ D on an outcome priced D. The total staked is S. Whichever outcome happens, the winning bet returns (1 ÷ D) × D = 1.
So you stake S and always get back 1. The share returned is 1 ÷ S, and as a percentage that is 100 ÷ S. Real bettors do not spread stakes this way, which is why the figure is an average built from the prices, not a forecast of anyone's result.
Step by step
- List every outcome of one market. A match result has three outcomes, an over or under line has two. Missing one makes the sum meaningless.
- Write each price as a decimal. Convert fractional or American prices first, as shown in the guide on decimal and fractional odds.
- Divide 1 by each price and add the results. This is S.
- Divide 100 by S. The answer is the payout percentage.
- Subtract it from 100 to get the share kept.
Two worked cases
Illustrative example: a two-way market
The invented prices are 1.80 and 2.00. Then 1 ÷ 1.80 = 0.5556 and 1 ÷ 2.00 = 0.5000, so S = 1.0556. The payout is 100 ÷ 1.0556 = 94.74%, and the share kept is 5.26%. Exactly, 1 ÷ 1.80 is 5/9, S is 19/18 and the payout is 18/19.
Illustrative example: a three-way market
The invented prices are 2.50, 3.20 and 3.00. Then 1 ÷ 2.50 = 0.4000, 1 ÷ 3.20 = 0.3125 and 1 ÷ 3.00 = 0.3333, so S = 1.0458. The payout is 100 ÷ 1.0458 = 95.62%, and the share kept is 4.38%.
| Market | Decimal prices | Implied probabilities | S | Payout | Share kept |
|---|---|---|---|---|---|
| Two-way | 1.80, 2.00 | 55.56%, 50.00% | 1.0556 | 94.74% | 5.26% |
| Three-way | 2.50, 3.20, 3.00 | 40.00%, 31.25%, 33.33% | 1.0458 | 95.62% | 4.38% |
All prices here are made up to show the method and are not taken from any bookmaker.
A shortcut for two outcomes
With two prices, A and B, the payout simplifies to (A × B) ÷ (A + B). For 1.80 and 2.00 that is 3.60 ÷ 3.80 = 0.9474, the same 94.74%. The shortcut saves a step but only works for two outcomes.
From payout percentage to shillings
Multiply the amount staked by the payout. At 94.74%, KES 1,000 staked returns KES 947.37 on average, so the average cost is KES 52.63. At 95.62% the same stake returns KES 956.18 and costs KES 43.82.
The cost applies to every shilling staked, including winnings that are staked again. The guide on expected loss per KES 1,000 staked gives a full table of this conversion.
How payout moves with S
A small rise in S can cost more than it looks, because the payout falls faster as S grows. Each row below is 100 ÷ S.
| Total implied probability (S) | Payout | Share kept | Average cost per KES 1,000 staked |
|---|---|---|---|
| 1.02 | 98.04% | 1.96% | KES 19.61 |
| 1.05 | 95.24% | 4.76% | KES 47.62 |
| 1.08 | 92.59% | 7.41% | KES 74.07 |
| 1.10 | 90.91% | 9.09% | KES 90.91 |
| 1.15 | 86.96% | 13.04% | KES 130.43 |
The table is arithmetic, not a description of any operator's prices. The guide on calculating the bookmaker's margin uses S minus 1, which is called the overround; the share kept above is 1 minus the payout, so check which of the two a quoted figure refers to.
Combined bets
When selections from different markets are combined, the average payouts multiply. If one leg pays out 94.74% and another 95.62%, the combination pays out 0.9474 × 0.9562 = 90.59%. This is why accumulators carry more margin than their single legs.
Casino games and "return to player"
For casino games the same idea is called return to player. Regulation 20(2) of the Gambling Control (Conduct of Gambling Operations) Regulations, 2026 requires a licensee to display clearly the rules of games, odds, house edge and average return to the player, and regulation 20(3) applies this to online gambling. Regulation 45(3) says the theoretical return to player percentage for each game must be publicly disclosed.
A return to player of 96% would mean KES 960 returned on average for every KES 1,000 staked, and the house edge is the remaining 4%. For sports betting, regulation 23(1) requires licensees to clearly display betting odds, rules and terms for each bet, which is what lets you do the sum above. The regulations as read here set no figure for a bookmaker's payout, and this guide quotes no typical percentages.
What the figure cannot tell you
A payout percentage is a long-run average for the cost of betting. It does not predict a result, and results swing widely around it, as explained in the guide on variance and losing streaks. A payout below 100% means that, on average, betting costs money.
Questions and answers
What does a payout percentage of 95% mean?
It means that, averaged over a very large number of bets spread across the outcomes in line with the prices, KES 95 comes back for every KES 100 staked and KES 5 is kept. It says nothing about what a single bet or a single evening will return.
Is the payout percentage the same as the chance of winning?
No. The chance of winning is the probability of one outcome. The payout percentage is a property of the whole set of prices in a market and measures how much of the money staked is returned on average.
Can I work out the payout percentage from one price?
No. You need the decimal price of every outcome of the same market. One price on its own gives only that outcome's implied probability.
Is the payout percentage equal to 100 minus the margin?
Yes if the margin means the share of stakes kept, which is 1 minus the payout. If the margin means the total implied probability minus 1, the two are close but not exact: a total of 1.10 gives a payout of 90.91%, not 90%.
Does a higher payout percentage make me more likely to win?
No. It lowers the average cost of each shilling staked, but it does not change how often any outcome happens. Betting at a higher payout percentage is still betting at a cost.