Odds Converter

Q: How do I convert American odds to decimal odds?

For positive American odds, divide by 100 and add 1: +150 becomes 2.50. For negative American odds, divide 100 by the odds (ignoring the minus sign) and add 1: -110 becomes 1.909.

Q: How do I turn odds into an implied probability?

Divide 1 by the decimal odds. Decimal odds of 2.00 imply 50%, and -110 (1.909) implies about 52.4%. The implied probability includes the sportsbook's margin, so it is higher than the fair chance.

Q: Why is the implied probability not the real chance?

Sportsbook prices include a margin called the vig. Add the implied probabilities of every outcome and the total is above 100%. Removing the vig gives the fair probability, which a no-vig calculator can do.

Type odds in any format and see all the others instantly: American, decimal, fractional and implied probability. Then add a stake to see your profit and payout. It runs in your browser and nothing is sent anywhere.

Convert

American Decimal Fractional Implied probability %

Edit any box and the others follow. "Evens" counts as 1/1. The implied probability still includes the sportsbook's margin, so it is not the fair chance. To remove the margin, use Devig Terminal.

What would I win?

Stake ($)

Profit if it wins

—

winnings only

Total return

—

profit plus your stake back

Break-even chance

—

how often it must win to break even

Common odds, converted

American	Decimal	Fractional	Implied
−500	1.20	1/5	83.33%
−300	1.3333	1/3	75.00%
−200	1.50	1/2	66.67%
−150	1.6667	2/3	60.00%
−120	1.8333	5/6	54.55%
−115	1.8696	20/23	53.49%
−110	1.9091	10/11	52.38%
−105	1.9524	20/21	51.22%
+100	2.00	evens	50.00%
+105	2.05	21/20	48.78%
+110	2.10	11/10	47.62%
+115	2.15	23/20	46.51%
+120	2.20	6/5	45.45%
+150	2.50	3/2	40.00%
+200	3.00	2/1	33.33%
+300	4.00	3/1	25.00%
+500	6.00	5/1	16.67%

How the conversions work

American → decimal: +A → 1 + A ÷ 100 · −A → 1 + 100 ÷ A
Fractional → decimal: n/d → 1 + n ÷ d
Decimal → implied probability: 1 ÷ decimal
Profit: stake × (decimal − 1)

Decimal odds are the total you get back for every 1 staked, stake included, so they are the easiest to compare. American odds show how much you win on 100 (positive) or how much you must stake to win 100 (negative). Fractional odds, common in the UK, show profit over stake.

The implied probability is the chance the price says the outcome has. Because sportsbooks build in a margin (the vig), the implied probabilities of all outcomes add up to more than 100%. Remove the margin to find the fair chance.

Common questions

How do I convert American odds to decimal odds?

For positive odds, divide by 100 and add 1: +150 becomes 2.50. For negative odds, divide 100 by the odds (ignore the minus sign) and add 1: -110 becomes 1.909.

How do I turn odds into an implied probability?

Divide 1 by the decimal odds. Decimal 2.00 implies 50%, and -110 (1.909) implies about 52.4%. It includes the sportsbook's margin, so it is higher than the fair chance.

What do fractional odds like 5/2 mean?

The first number is the profit and the second is the stake. At 5/2 you win 5 for every 2 staked, so a 2 stake returns 7 in total, which is decimal 3.50.

Why is the implied probability not the real chance?

Sportsbook prices include a margin called the vig. The implied probabilities of every outcome add up to more than 100%. Removing the vig gives the fair probability, which a no-vig calculator can do.

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