How do you convert American odds to decimal odds?

For positive American odds, divide by 100 and add 1, so +150 becomes 2.50. For negative American odds, divide 100 by the number without the minus sign and add 1, so -200 becomes 1.50.

How do you convert decimal odds to American odds?

If the decimal odds are 2.00 or higher, subtract 1 and multiply by 100, so 2.50 becomes +150. If they are below 2.00, divide -100 by the decimal odds minus 1, so 1.50 becomes -200.

-110 means you stake 110 to win 100, or 10 to win 9.09. It is 1.91 in decimal odds and 10/11 in fractional odds, with an implied chance of 52.4%.

What do fractional odds like 5/2 mean?

5/2 means you win 5 for every 2 you stake, plus your stake back. It equals 3.50 in decimal odds and +250 in American odds.

What does a plus or minus sign mean in odds?

A minus sign marks the favorite: the amount you stake to win 100. A plus sign marks the underdog: the amount you win on a 100 stake. +100 and -100 both mean even money.

Odds converter

Type a price in any box and the rest fill in: American, decimal and fractional odds, the implied chance and what your stake would win.

Type in any box

American

Decimal

Fractional

Implied chance %

Stake

American odds to decimal

American odds are built around 100. A plus number is what a 100 stake wins; a minus number is what you stake to win 100.

+odds: decimal = odds ÷ 100 + 1
−odds: decimal = 100 ÷ |odds| + 1

So +150 is 150 ÷ 100 + 1 = 2.50, and -200 is 100 ÷ 200 + 1 = 1.50.

Decimal odds to American

decimal ≥ 2.00: American = (decimal − 1) × 100
decimal < 2.00: American = −100 ÷ (decimal − 1)

2.50 becomes (2.50 − 1) × 100 = +150. 1.50 becomes −100 ÷ 0.50 = -200.

Fractional odds

Fractional odds show profit over stake: 5/2 wins 5 for every 2 you put down. Divide and add 1 for decimal odds, so 5/2 is 3.50 and 10/11 is 1.91. Long or combined prices are often written over 1, like 6.16/1.

Implied probability

Every price implies a chance of winning: 1 divided by the decimal odds. -110 is 1 ÷ 1.909 = 52.4%. Both sides of a market add up to more than 100% because the sportsbook builds in a margin. The implied probability calculator takes it out. For a plain-English look at the most common prices, see betting odds explained.

Odds conversion chart

Common prices in every format, with the profit on a 100 stake.
American	Decimal	Fractional	Implied	Wins on 100
-1000	1.10	1/10	90.9%	10.00
-500	1.20	1/5	83.3%	20.00
-400	1.25	1/4	80.0%	25.00
-300	1.33	1/3	75.0%	33.33
-250	1.40	2/5	71.4%	40.00
-200	1.50	1/2	66.7%	50.00
-175	1.57	4/7	63.6%	57.14
-150	1.67	2/3	60.0%	66.67
-140	1.71	5/7	58.3%	71.43
-130	1.77	10/13	56.5%	76.92
-125	1.80	4/5	55.6%	80.00
-120	1.83	5/6	54.5%	83.33
-115	1.87	20/23	53.5%	86.96
-110	1.91	10/11	52.4%	90.91
-105	1.95	19/20	51.2%	95.24
+100	2.00	1/1	50.0%	100.00
+105	2.05	21/20	48.8%	105.00
+110	2.10	11/10	47.6%	110.00
+120	2.20	6/5	45.5%	120.00
+125	2.25	5/4	44.4%	125.00
+130	2.30	13/10	43.5%	130.00
+140	2.40	7/5	41.7%	140.00
+150	2.50	3/2	40.0%	150.00
+175	2.75	7/4	36.4%	175.00
+200	3.00	2/1	33.3%	200.00
+250	3.50	5/2	28.6%	250.00
+300	4.00	3/1	25.0%	300.00
+400	5.00	4/1	20.0%	400.00
+500	6.00	5/1	16.7%	500.00
+1000	11.00	10/1	9.09%	1,000.00