A price can be written three ways. They all say the same thing: how much a winning bet pays back for what you staked. Unitley shows American odds, the US standard, and works in decimal underneath.
American odds
- A minus price is the stake that wins $100. At −150 you stake $150 to win $100, so $100 staked wins $66.67.
- A plus price is what $100 wins. At +130, $100 staked wins $130.
- −110 is the usual price on each side of a spread or total: $110 to win $100.
There is no American price between −100 and +100. Even money is written +100 (or −100; they are the same bet).
Decimal odds
Decimal odds are the total paid back per $1 staked, stake included. They make the math easy, which is why every Unitley calculator works in decimal.
| American | Decimal | $100 wins |
|---|---|---|
| −150 | 1.667 | $66.67 |
| −110 | 1.909 | $90.91 |
| +100 | 2.000 | $100.00 |
| +130 | 2.300 | $130.00 |
| +200 | 3.000 | $200.00 |
To convert:
- A minus price: decimal = 1 + 100 ÷ the price without its sign. −150 is 1 + 100 ÷ 150 = 1.667.
- A plus price: decimal = 1 + the price ÷ 100. +130 is 1 + 130 ÷ 100 = 2.30.
Fractional odds
Fractional odds, common in the UK, are the profit per unit staked: 3/2 pays $3 profit for every $2 staked, the same as decimal 2.50 or +150. 10/11 is −110.
In Unitley
Every tool that takes a price takes American odds as a number (-150, 130). calc_implied_probability converts one to decimal and to the chance it implies (see the implied probability guide).
Names set like this are Unitley’s tools: what your AI agent, or the analyst in the web app, calls to get these numbers. See the docs