Calculator guide
Polymarket probability calculator guide
A YES price is the fastest way to read a prediction-market probability, but it is not the whole story.
Independent educational content. Not financial, betting, legal or trading advice. Always review platform rules and local availability.
The basic conversion
- A 12¢ YES price is roughly 12% implied probability.
- A 50¢ YES price is roughly 50% implied probability.
- A 87¢ YES price is roughly 87% implied probability.
What the calculator does not include
- Trading fees, spreads, slippage and order-book depth.
- Resolution risk and ambiguous market wording.
- Taxes, jurisdiction and platform availability.
Best use
Use the calculator as an education tool: convert the price, read the rules, then inspect current liquidity on the platform.
Useful next step
Use the implied probability calculator or compare related topic hubs before opening any live market.