The easiest explanation found so far
Fractional Odds
(Also known as Traditional or British)
Used mainly in the UK and international horse racing. Becoming less popular online.
Tell you the amount of profit relative to your stake if you win your bets.
For example, if you bet £10 at odds of 3/1, you receive £30 profit if you win.
4/17=bet $17, win $4, total return $21
Decimal Odds
(Also known as European)
Common around the world but especially in Europe. Standard on betting exchanges such as Betfair.
Convey the total amount you will receive if you win, including the return of your stake.
For example, if you bet £10 at odds of 3.75, you will receive £37.50 in total if you win.
1.42=bet $1, win $0.42, total return $1.42
Moneyline Odds
(Also known as American)
Used by most US bookmakers.
Based on a straight single bet (on a single outcome, without a points spread)
If the moneyline is positive, the amount quoted is the amount you would win on a $100 bet.
If it is negative, the amount quoted is what you would need to bet to win $100.
+170=bet $100, win $170, total return $270 (=17/10 or 2.70)
-125=bet $125, win $100, total return $225 (=4/5 or 1.80)
-100=bet $100, win $100, total return $200 (=1/1 or 2.00)
http://oddsconverter.co.uk/
Fractional Odds
(Also known as Traditional or British)
Used mainly in the UK and international horse racing. Becoming less popular online.
Tell you the amount of profit relative to your stake if you win your bets.
For example, if you bet £10 at odds of 3/1, you receive £30 profit if you win.
4/17=bet $17, win $4, total return $21
Decimal Odds
(Also known as European)
Common around the world but especially in Europe. Standard on betting exchanges such as Betfair.
Convey the total amount you will receive if you win, including the return of your stake.
For example, if you bet £10 at odds of 3.75, you will receive £37.50 in total if you win.
1.42=bet $1, win $0.42, total return $1.42
Moneyline Odds
(Also known as American)
Used by most US bookmakers.
Based on a straight single bet (on a single outcome, without a points spread)
If the moneyline is positive, the amount quoted is the amount you would win on a $100 bet.
If it is negative, the amount quoted is what you would need to bet to win $100.
+170=bet $100, win $170, total return $270 (=17/10 or 2.70)
-125=bet $125, win $100, total return $225 (=4/5 or 1.80)
-100=bet $100, win $100, total return $200 (=1/1 or 2.00)
| UK | EU | US | UK | EU | USA | UK | EU | USA | ||
| 1/5 | 1.20 | -500 | 10/11 | 1.91 | -110 | 95/40 | 3.38 | +237.50 | ||
| 2/9 | 1.22 | -450 | 20/21 | 1.95 | -105 | 12/5 | 3.40 | +240 | ||
| 1/4 | 1.25 | -400 | 1/1 | 2.00 | -100 | 5/2 | 3.50 | +250 | ||
| 2/7 | 1.28 | -350 | 21/20 | 2.05 | +105 | 13/5 | 3.60 | +260 | ||
| 3/10 | 1.30 | -333.30 | 11/10 | 2.10 | +110 | 11/4 | 3.75 | +275 | ||
| 1/3 | 1.33 | -300 | 6/5 | 2.20 | +120 | 14/5 | 3.80 | +280 | ||
| 7/20 | 1.35 | -285.70 | 5/4 | 2.25 | +125 | 3/1 | 4.00 | +300 | ||
| 4/11 | 1.36 | -275 | 13/10 | 2.30 | +130 | 16/5 | 4.20 | +320 | ||
| 2/5 | 1.40 | -250 | 11/8 | 2.38 | +137.50 | 10/3 | 4.33 | +333.30 | ||
| 4/9 | 1.44 | -225 | 7/5 | 2.40 | +140 | 7/2 | 4.50 | +350 | ||
| 9/20 | 1.45 | -222.20 | 6/4 | 2.50 | +150 | 18/5 | 4.60 | +360 | ||
| 40/85 | 1.47 | -212.50 | 8/5 | 2.60 | +160 | 4/1 | 5.00 | +400 | ||
| 1/2 | 1.50 | -200 | 13/8 | 2.63 | +162.50 | 9/2 | 5.50 | +450 | ||
| 8/15 | 1.53 | -187.50 | 17/10 | 2.70 | +170 | 5/1 | 6.00 | +500 | ||
| 4/7 | 1.57 | -175 | 7/4 | 2.75 | +175 | 11/2 | 6.50 | +550 | ||
| 3/5 | 1.60 | -166.70 | 9/5 | 2.80 | +180 | 6/1 | 7.00 | +600 | ||
| 8/13 | 1.62 | -162.50 | 15/8 | 2.88 | +187.50 | 13/2 | 7.50 | +650 | ||
| 5/8 | 1.63 | -160 | 19/10 | 2.90 | +190 | 7/1 | 8.00 | +700 | ||
| 4/6 | 1.66 | -150 | 2/1 | 3.00 | +200 | 15/2 | 8.50 | +750 | ||
| 7/10 | 1.70 | -142.90 | 21/10 | 3.10 | +210 | 8/1 | 9.00 | +800 | ||
| 8/11 | 1.72 | -137.50 | 85/40 | 3.13 | +212.50 | 17/2 | 9.50 | +850 | ||
| 4/5 | 1.80 | -125 | 11/5 | 3.20 | +220 | 9/1 | 10.00 | +900 | ||
| 5/6 | 1.83 | -120 | 9/4 | 3.25 | +225 | 10/1 | 11.00 | +1000 | ||
| 9/10 | 1.90 | -111.10 | 23/10 | 3.30 | +230 | 50/1 | 51.00 | +5000 |
http://oddsconverter.co.uk/
