Calcs & Convertors
These tools don’t predict anything. Paired with the xWin Engine’s probabilities, they’re what turns a view into a properly sized bet.
The same calculators we’ve used for years alongside the match maths, nothing new, just made public.
- Convert a price
- Strip the bookmaker’s margin
- Check if a bet is actually worth the stake
- Size a lay to lock in a position
Bring your own view of the match. These tools just make sure the numbers stack up.
This isn’t the model powering the rest of the site, but it’s the same maths, handed to you. Set your own expected goals for either side and see what probabilities that view implies.
| 0 | 1 | 2 | 3 | 4 | 5 |
|---|
Every odd or price is a probability wearing a different costume. We work in decimal because it converts straight back to a percentage with no extra steps but know people have their own preference. Enter any format below and the other three update to match.
| Implied Probability | Decimal | Fractional | American |
|---|---|---|---|
| 90.9% | 1.10 | 1/10 | -1000 |
| 66.7% | 1.50 | 1/2 | -200 |
| 50.0% | 2.00 | Evens | +100 |
| 33.3% | 3.00 | 2/1 | +200 |
| 20.0% | 5.00 | 4/1 | +400 |
| 10.0% | 10.00 | 9/1 | +900 |
Kelly staking sizes a bet by the edge you actually have, not a flat percentage of your bankroll. Bigger edge, bigger stake. No edge, no bet.
Tells you whether a price is actually worth backing, given what you think the real probability is and not just whether you think it’ll win.
Every bookmaker price has their margin baked in. This strips it out and shows the market’s real, vig-free probability.
Sizes a lay bet on an exchange to lock in a result regardless of outcome — cash out a back bet or trade around a shifting price.