What Are Odds? How to Read Betting Odds

Updated: 3 November 2026

Odds are the numbers a bookmaker puts on every possible outcome, for example Team A to win a match. They tell you two things: how much you get back if the bet wins, and how likely the bookmaker thinks that outcome is. Once you understand odds, you can also see why, over time, the bookmaker is the one that makes money.

This page explains decimal odds, how to turn odds into a probability, the margin the bookmaker builds into every price, and why odds keep moving. All odds on this page are made-up examples.

Decimal odds

Betting sites in Kenya usually show odds in decimal format, for example 1.50, 2.00 or 3.40. The calculation is simple:

Payout = stake × odds

Example: you stake KSh 100 at odds of 2.50 and the bet wins. The payout is KSh 250. That figure includes your KSh 100 stake, so your profit is KSh 150. If the bet loses, you lose the KSh 100.

Two more things to keep in mind:

• The payout above is before tax. In Kenya, tax on winnings is withheld by the operator before the money reaches your account, and deposits carry a 5% excise duty. The details are on our page about betting law and tax in Kenya.
• Odds of exactly 1.00 would only give your stake back. The closer odds are to 1.00, the smaller the profit.

Low odds (close to 1.00) mean the bookmaker sees the outcome as likely, so the payout is small. High odds mean the bookmaker sees the outcome as unlikely, so the payout is bigger.

Odds and implied probability

Every decimal price has a probability inside it. To find it:

Implied probability = 1 ÷ odds

Multiply the result by 100 to get a percentage.

Odds	Implied probability
1.25	80%
1.50	about 67%
2.00	50%
3.00	about 33%
5.00	20%
10.00	10%

So odds of 2.00 mean the bookmaker rates the outcome at about a 50% chance. This is the bookmaker’s estimate, not a certainty. Even if the estimate is right, a team at odds of 1.25 will still fail to win roughly one match in five.

The bookmaker margin

A bookmaker does not offer “fair” odds. It sets each price a little below what the true chance would justify, and the difference is its margin. You may also see it called the overround or the vig. You can find the margin by adding up the implied probabilities of every outcome in a market.

1X2 example (made-up odds, for illustration only):

Outcome	Odds	Implied probability (1 ÷ odds)
Team A wins (1)	2.10	47.6%
Draw (X)	3.30	30.3%
Team B wins (2)	3.60	27.8%
Total		105.7%

One of these three results must happen, so fair probabilities would add up to exactly 100%. Here they add up to 105.7%. The extra 5.7% is the bookmaker margin built into these prices.

What it means in shillings: suppose you wanted to receive KSh 1,000 whatever the result. You would need to stake about KSh 476 on Team A (476 × 2.10 = about 1,000), KSh 303 on the draw and KSh 278 on Team B. That is KSh 1,057 in total. You pay KSh 1,057 to get KSh 1,000 back, and the bookmaker keeps KSh 57.

What fair odds would look like: if you remove the extra 5.7% evenly, the same match without a margin would be priced at about 2.22, 3.49 and 3.81. The odds you are actually offered are lower on every outcome.

Two-way example: in an over/under market with odds of 1.90 on each side, each side has an implied probability of 52.6%, and the total is 105.3%. Fair odds would be 2.00 on each side.

This is why, over many bets, you get back less on average than you stake. No system or strategy changes this arithmetic. The size of the margin differs from market to market and from bookmaker to bookmaker, but it is always there.

Why odds move

Odds are not fixed from the moment they are published until the match ends. The main reasons they change:

• Team news: injuries, the starting line-up, a suspended player or a new coach.
• Money from bettors: if many people bet on one side, the bookmaker may cut the odds on that side and raise them on the other, to balance its risk.
• Events during the match: in live betting, a goal, a red card or simply the clock running down changes the odds minute by minute. The bookmaker may also suspend a market for a short time after a big moment.
• Other changes around the match: for example a new venue, heavy rain or a delayed kick-off.
• Different bookmakers: each bookmaker sets its own prices, so odds for the same match can differ from one site to another.

If the odds change after you add a selection to your betslip, some bookmakers ask you to accept the new odds before the bet goes through. Check the final odds on the slip before you confirm, especially on a slow connection.

High odds do not mean a better bet

Big odds look attractive, but they reflect a small chance. A bet at odds of 10.00 is expected to win roughly one time in ten, and the margin is already inside that price. The same applies to multibets: the odds multiply, but so does the risk. Our page on bet types and multibets shows how quickly the chance of a multibet winning falls as you add selections.

Odds also say nothing about what will happen in a single match. A price of 1.25 is not a promise, and a price of 8.00 is not a hidden opportunity. Both are the bookmaker’s estimate with its margin added.

Other odds formats you may see

Most Kenyan betting sites use decimal odds, but match previews and foreign sites sometimes use other formats:

• Fractional odds, such as 6/4, show the profit for each unit staked. To convert to decimal, divide and add 1: 6 ÷ 4 + 1 = 2.50.
• American odds, such as +150 or -200. A plus number is the profit on a stake of 100, so +150 equals decimal 2.50. A minus number is the stake needed to make a profit of 100, so -200 equals decimal 1.50.

Whatever the format, the bookmaker margin works the same way.

Frequently asked questions

What do odds of 1.50 mean? If you stake KSh 100 and the bet wins, you receive KSh 150 before tax: your KSh 100 back plus KSh 50 profit. The implied probability is about 67%, by the bookmaker’s estimate.

Do higher odds mean a better chance of winning? No, the opposite. Higher odds mean a bigger payout but a smaller chance that the outcome happens.

Why do two sites show different odds for the same match? Each bookmaker sets its own prices and its own margin, and reacts to news and to money from bettors at its own speed.

Can understanding odds guarantee that I win? No. Understanding odds helps you see what a bet costs, but the bookmaker margin is built into every price. Set a budget before you bet and read our guide to responsible gambling.