This football odds calculator shows what a bet returns in Kenyan shillings before you place it. Enter your stake and the decimal odds for a single, or add legs to build an accumulator, and the calculator multiplies the odds, shows the potential return and converts each price into an implied probability. Below the tool we explain the maths, so you can check any betslip by hand.
Odds and accumulator calculator
Odds and accumulator calculator
- Total odds
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- Potential return
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- Profit
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- Implied probability
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Odds converter
Enter decimal (3.50), fractional (5/2) or American (+250) odds.
- Decimal
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- Fractional
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- American
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- Implied probability
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Figures are before any tax, bonus or cash-out rules your bookmaker applies. The bet slip on the bookmaker site is always the final word.
The calculator works with decimal odds, the format every major Kenyan bookmaker uses. If a tipster or a foreign site gives fractional or American odds, convert them with the table further down first. The return shown is before tax; your bookmaker deducts withholding tax from winnings at payout.
How betting odds are calculated
Decimal odds tell you the total return per shilling staked, including your stake. The formula is simple:
- Return = stake x odds. KES 200 at odds of 2.50 returns KES 500.
- Profit = return - stake. In the example, KES 300.
- Implied probability = 1 / odds. Odds of 2.50 imply a 40 percent chance.
Implied probability is the most useful number on the screen. It tells you how often the bet must win just to break even. If you think a team wins 50 percent of the time and the odds imply 40 percent, the price looks generous. If you think it is closer to 35 percent, the bet is poor value however tempting the return.
Accumulators: why the odds multiply
An accumulator pays only if every leg wins, so the odds of each leg are multiplied. Four legs at 1.50, 1.60, 1.80 and 2.00 give total odds of 8.64. A KES 100 stake returns KES 864. The implied chances multiply too: about 67, 63, 56 and 50 percent combine to roughly 12 percent. Each new leg makes the return bigger and the chance smaller.
| Legs at odds 1.50 | Total odds | Return on KES 100 | Implied chance |
|---|---|---|---|
| 1 | 1.50 | KES 150 | 67% |
| 3 | 3.38 | KES 338 | 30% |
| 5 | 7.59 | KES 759 | 13% |
| 8 | 25.63 | KES 2,563 | 4% |
| 10 | 57.67 | KES 5,767 | 2% |
Implied chances above ignore the bookmaker margin, so the real chances are lower still. This is why "sure 2 odds" slips built from many short-priced legs lose so often; see our accumulator tips for a more careful approach.
Converting fractional and American odds
| Fractional | American | Decimal | Implied chance |
|---|---|---|---|
| 1/2 | -200 | 1.50 | 67% |
| 4/5 | -125 | 1.80 | 56% |
| 1/1 (evens) | +100 | 2.00 | 50% |
| 6/4 | +150 | 2.50 | 40% |
| 3/1 | +300 | 4.00 | 25% |
Fractional to decimal: divide the two numbers and add 1. American positive odds: divide by 100 and add 1. American negative odds: divide 100 by the number without the minus sign and add 1.
Spotting the bookmaker margin
Add up the implied probabilities of every outcome in a market. On a fair coin the total would be exactly 100 percent. On a 1X2 market with odds of 2.10, 3.30 and 3.60, the total is about 47.6 + 30.3 + 27.8 = 105.7 percent. The extra 5.7 percent is the bookmaker margin. Comparing the same match across sites shows who prices it more tightly; our list of betting sites with the best odds is built around this idea.
Worked example: a Kenyan weekend slip
Say you build a three-leg slip: an EPL home win at 1.65, a La Liga over 2.5 at 1.85 and a KPL double chance at 1.40. Total odds are 1.65 x 1.85 x 1.40 = 4.27. A KES 300 stake returns about KES 1,282 before tax. The implied chance of all three landing is about 23 percent, roughly one weekend in four, before allowing for the bookmaker margin. Seen that way, the slip is a reasonable small-stake bet, not a near-certainty.
Free bets, tax and other adjustments
- Free bets. With most free bet offers the stake is not returned, so a free bet of KES 100 at odds of 3.00 pays KES 200, not 300. Check the operator terms.
- Tax. Withholding tax is deducted from winnings, and excise duty is taken when you deposit, so the real profit on a bet is lower than the calculator's figure. Our betting tax guide explains how both are applied.
- Bonus boosts. Accumulator boosts add a percentage to winnings under conditions set by the operator. Read the terms before counting on them.
Using the calculator well
Run the numbers before you place a slip, not after. If the return looks exciting but the implied chance is below 10 percent, ask whether you would still place the bet if you saw that number first. Betting is for adults 18+ only; a calculator helps you understand risk, not remove it.
| Rank | Operator | Rating | Welcome offer | Highlights | Visit |
|---|---|---|---|---|---|
| 1 |  SportPesaRead review of SportPesa | Our rating: 7.5 out of 10 | See current offer on site |
| Visit siteReview of SportPesa |
| 2 |  BetikaRead review of BetikaM-Pesa paybill 290290 | Our rating: 8.0 out of 10 | See current offer on site |
| Visit siteReview of Betika |
| 3 |  SportyBetRead review of SportyBetM-Pesa paybill 590555 | Our rating: 6.5 out of 10 | See current offer on site |
| Visit siteReview of SportyBet |
| 4 |  OdiBetsRead review of OdiBetsM-Pesa paybill 290680 | Our rating: 7.5 out of 10 | Free bet for new customers18+ T&Cs apply |
| Visit siteReview of OdiBets |
| 5 |  BetPawaRead review of BetPawa | Our rating: 7.5 out of 10 | See current offer on site |
| Visit siteReview of BetPawa |
18+. Offers and terms change often: always read the full terms on the operator site before you deposit.
Frequently asked questions
How do I calculate returns on an accumulator?
Multiply the decimal odds of every leg, then multiply by your stake. Three legs at 1.50, 2.00 and 1.80 give 5.40, so KES 100 returns KES 540 before tax.
What does implied probability mean?
It is the chance of an outcome that the odds suggest, worked out as 1 divided by the decimal odds. Odds of 4.00 imply 25 percent.
Does the calculator include withholding tax?
No. It shows the return before tax. The bookmaker deducts withholding tax from winnings at payout, so check your betslip for the net figure.
Can I use the calculator for lotto or jackpots?
For lotto, enter the payout multiple as decimal odds to see the implied chance. Jackpots use pools rather than fixed odds, so use the line count method on our jackpot pages instead.
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