Free Polymarket tools

Calculators that use Polymarket's real fee formula. No sign-up, nothing stored.

Calculate the exact Polymarket taker fee for any trade by category, price and number of shares, using the official fee formula.

Work out your Polymarket profit or loss before you trade: payout if you win, loss if you lose, selling early, taker fees and break-even probability.

Compare your probability estimate with the Polymarket price to find expected value per share on YES and NO, after taker fees.

Convert Polymarket prices in cents to implied probability, decimal, American and fractional odds, and back again, to compare with sportsbooks.

Size Polymarket positions with the Kelly criterion: enter price, your probability and bankroll to get full, half or quarter Kelly stake.

Check whether buying both YES and NO in a Polymarket market locks in a profit after Polymarket taker fees, and what to watch for across platforms.

Search your country to see whether Polymarket is available, close-only or blocked in 2026, with a link to the full country guide.

Calculate Polymarket Perps trading fees by 30-day volume tier, maker or taker side and position size, including the top-tier maker rebate.

Estimate Polymarket referral income under the terms in force since May 2026: 10% of direct and 5% of indirect referrals' net fees for 30 days.