Betting Odds Explained: From Decimal Price to Real Cost

Reviewed by Shakib Al Mamun, Cricket Betting Analyst Last updated 22 September 2026

Shield and chart motif representing odds calculation

Expert Insight

Who: Written by Shakib Al Mamun, sports betting analyst. How: Every calculation below is worked through with real figures you can reproduce. Why: Almost nobody calculates margin, which is why almost nobody notices when they are getting a bad price.

In short

Decimal odds show total return per unit staked, including the stake. Implied probability is 1 divided by the price. Add the implied probabilities across a market and the excess over 100% is the operator's margin — the number that actually determines whether a price is good.

Odds look like a prediction and function as a price. Learning to convert between the two takes about ten minutes and is the only piece of betting mathematics that genuinely changes decisions.

This guide works through decimal odds, implied probability and margin with numbers you can check yourself.

Reading decimal odds

Decimal odds show your total return per unit staked, stake included. A ৳100 bet at 2.50 returns ৳250 in total — ৳150 of profit plus your ৳100 back.

Odds	৳100 stake returns	Profit
1.50	৳150	৳50
2.00	৳200	৳100
2.50	৳250	৳150
5.00	৳500	৳400
10.00	৳1,000	৳900

Common confusion: 2.00 is not double your money in profit terms — it is double your return, which is a 100% profit. Odds of 3.00 triple the return, not the profit.

Converting to implied probability

Implied probability is 1 divided by the decimal price, expressed as a percentage. Odds of 2.00 imply 50%; odds of 4.00 imply 25%.

Odds	Calculation	Implied probability
1.50	1 ÷ 1.50	66.7%
1.90	1 ÷ 1.90	52.6%
2.00	1 ÷ 2.00	50.0%
3.00	1 ÷ 3.00	33.3%
5.00	1 ÷ 5.00	20.0%

This is the operator's stated view of the outcome, inflated by its margin. It is not a neutral probability estimate.

Calculating the margin

Add the implied probabilities of every outcome in a market. A fair market would total 100%. The excess is what the operator takes regardless of the result.

Worked example on a two-way cricket market priced 1.90 and 1.90:

1 ÷ 1.90 = 52.6%
1 ÷ 1.90 = 52.6%
52.6% + 52.6% = 105.2%
Margin = 105.2% − 100% = 5.2%

Now the same market priced 1.95 and 1.95: 51.3% + 51.3% = 102.6%, a margin of 2.6%. The second book costs you half as much on every bet.

Three-way markets

Football 1X2 markets have three outcomes, so add all three implied probabilities. The arithmetic is identical, and margins are usually a little wider than two-way markets.

Example: home 2.10, draw 3.40, away 3.60.

1 ÷ 2.10 = 47.6%
1 ÷ 3.40 = 29.4%
1 ÷ 3.60 = 27.8%
Total = 104.8%, margin = 4.8%

Rule of thumb: under 105% on a three-way football market is competitive. Over 110% means you are paying more than twice what a sharp book would charge.

What margin means over a season

Margin is a per-bet cost that compounds with turnover, exactly like a casino house edge. The difference between a 3% and an 8% book is substantial over a year.

Annual turnover	Cost at 3% margin	Cost at 8% margin	Difference
৳50,000	৳1,500	৳4,000	৳2,500
৳100,000	৳3,000	৳8,000	৳5,000
৳250,000	৳7,500	৳20,000	৳12,500

This assumes no skill edge in either direction. It is simply what the pricing costs before any question of whether your selections are good.

Accumulators and compounding margin

Each leg of an accumulator carries its own margin, and they compound. A four-fold at 4% per leg carries roughly 17% total margin.

Legs	Margin at 4% per leg	Margin at 6% per leg
1	4%	6%
2	8%	12%
4	17%	26%
6	27%	42%
8	37%	59%

Critical: this is why accumulator promotions are so heavily marketed. An eight-fold at ordinary margins costs the bettor more than a third of expected value before any selection is considered.

Using this in practice

Check margin once per operator on two markets. It is stable within a book, so the measurement holds and takes about two minutes.

Pick a two-way market you would actually bet.
Convert both prices to implied probability.
Add them and subtract 100%.
Repeat on one other market to confirm.
Compare against another operator on the same fixture.

Compare current odds

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Responsible Gaming

Cricket betting carries a particular risk: a match lasts hours, and in-play markets invite a decision every over. Set a limit on total stake for the fixture before the toss, not during the innings break.

Chasing a losing position with an in-play bet is the most common way a planned stake becomes an unplanned one. Deposit limits in account settings apply immediately when lowered and are held 24 hours when raised.

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Frequently Asked Questions

What do decimal odds of 2.50 mean?

Your total return is 2.5 times your stake, including the stake itself. A ৳100 bet returns ৳250 — ৳150 profit plus your original ৳100.

How do I calculate implied probability from odds?

Divide 1 by the decimal price. Odds of 2.00 give 1 ÷ 2.00 = 50%; odds of 4.00 give 25%. This is the operator's view of the outcome with its margin included.

What is a bookmaker's margin?

The amount by which the implied probabilities of a market exceed 100%. A two-way market priced 1.90 and 1.90 totals 105.2%, so the margin is 5.2% — what the operator takes regardless of the result.

What is a good margin to look for?

Under 105% combined implied probability on a two-way or three-way market is competitive. Over 110% means you are paying roughly twice what a sharp operator would charge on the same bet.

Why are accumulators bad value?

Because the margin compounds on every leg. At 4% per leg, a four-fold carries about 17% total margin and an eight-fold around 37%, before any question of whether your selections are good.

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