# Odds converter

> Independent. Not affiliated with, endorsed by or sponsored by Novig.

Canonical: https://novigapi.com/odds-converter
Method checked: 2026-11-12
Interactive tool: https://novigapi.com/odds-converter (prefill with ?a=&b=)

+150 American is 2.50 decimal, 3/2 fractional and a 40.00% implied probability; -150 is 1.667 decimal, 2/3 and 60.00%. Novig shows the implied probability itself as the price, so a 40% Novig contract is +150 before fees (Novig docs, checked 12 Nov 2026).

## Worked example

Common conversions

| American | Decimal | Fractional | Implied |
| --- | --- | --- | --- |
| -200 | 1.50 | 1/2 | 66.67% |
| -150 | 1.667 | 2/3 | 60.00% |
| -110 | 1.909 | 10/11 | 52.38% |
| +100 | 2.00 | 1/1 | 50.00% |
| +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% |

```
decimal = 1 + A/100 (A > 0) or 1 + 100/-A (A < 0)
implied = 1 / decimal
fractional = decimal - 1 as a fraction
```

All four formats say the same thing: how much a winning bet returns. Decimal includes the stake; American shows the profit on $100 (positive) or the stake to win $100 (negative); fractional shows profit over stake; implied probability is the break-even win rate.

## How to use it

1. Enter a price in any format.
2. Read it in every other format.
3. Use the stake table for profit and total return.

## Questions

### How do I convert American odds to decimal?

For positive odds, divide by 100 and add 1. For negative odds, divide 100 by the odds without the sign and add 1.

### What is +100 in decimal?

2.00, an even-money bet with a 50% implied probability.

---

Get a free API key: https://novigapi.com/sign-up . Docs: https://novigapi.com/docs . MCP: https://novigapi.com/api/mcp . Operated by Stunning Couches LLC. Independent. Not affiliated with, endorsed by or sponsored by Novig.