Calculators / Lay odds converter
Lay odds converter
One price in, the fair price of the opposite outcome out — a quick estimate for two-way markets, not a live exchange quote.
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The same field converts either way: feed it the opposite side's price and you get the original back.
Opposite odds (decimal)
Opposite odds (your format)
This side, implied
Opposite side, implied
How it works
If a price implies a P% chance of happening, the only outcome left in a two-way market implies (100 − P)%. Converting that back into decimal odds gives the opposite side's fair price: odds ÷ (odds − 1).
It is self-inverse — run the result back through the same box and you land on the price you started with.
Common conversions
| This side | Implied | Opposite side | Implied |
|---|---|---|---|
| 1.50 | 66.7% | 3.00 | 33.3% |
| 1.91 | 52.4% | 2.10 | 47.6% |
| 2.00 | 50.0% | 2.00 | 50.0% |
| 3.00 | 33.3% | 1.50 | 66.7% |