Polymarket Calculators: Payout, Odds and Fee Tools
By WhaleSays Editorial · Updated · 3 min read
Three free calculators answer what most people ask before a first Polymarket trade: what a bet pays, what a price means in bookmaker odds, and what it costs. Each one starts from a live market, and none needs an account.
WhaleSays is independent and not affiliated with Polymarket. Our Polymarket sign-up links are affiliate links: we may receive a share of the trading fees you pay, and you pay nothing extra. See the affiliate disclosure. This page is information, not financial or legal advice.
Polymarket calculator
Type an amount and a price in cents. See what you get back if you are right, what you lose if you are wrong, and the fee.
Right now: $100 on Manchester United FC to win (Manchester United FC vs. AS Roma) at 44.5¢ returns $224.72 if you are right and loses $102.78 if you are wrong.
Open the calculatorPolymarket odds converter
Turn a Polymarket price into American, decimal and fractional odds, and compare a bookmaker line with the price on Polymarket.
Right now: Manchester United FC to win (Manchester United FC vs. AS Roma) at 44.5¢ is +125 in American odds and 2.25 in decimal.
Open the odds converterPolymarket fee calculator
See the taker fee on any trade in dollars and as a share of the trade, by category, and the price you need to break even.
For example, $100 at 50¢ in a sports market pays a taker fee of $2.50, or 2.5% of the trade.
Open the fee calculator
A share price is not a promise. If you buy and the outcome does not happen, you lose what you paid, plus any fee. Only trade money you can afford to lose; see trading responsibly. These tools do maths on prices you enter. They are not financial advice and not a prediction.
Which tool do I need?
- I saw a Polymarket price in the news and want to know what $50 would win.
- Use the Polymarket calculator. Type an amount and a price in cents. It shows what you get back if you are right, what you lose if you are wrong, and the fee, in plain dollars first and shares and odds second.
- I bet on sports with a bookmaker and think in −110 or 1.91.
- Use the Polymarket odds converter. It turns a price into American, decimal and fractional odds, and compares your bookmaker's line, margin included, with what Polymarket would pay at the fair price.
- I want to know what a trade costs before I make it.
- Use the Polymarket fee calculator. It shows the taker fee in dollars and as a share of the trade, the fee at other prices and the price you need to break even. For the full rules, read Polymarket fees explained.
- I am curious who actually makes money on Polymarket.
- See the Polymarket leaderboard for the top traders by profit, and read Polymarket vs sportsbooks if you are weighing it against a bookmaker.
Ready for a first trade?
Opening a Polymarket account takes a few minutes, and you can start with a small deposit. WhaleSays is independent; signing up through our link costs you nothing extra.
Frequently asked questions
- Are the Polymarket calculators free?
- Yes. They are free, need no sign-up and do their maths in your browser. WhaleSays is independent and earns an affiliate commission if you open a Polymarket account through our links, which costs you nothing extra.
- Do I need a Polymarket account to use them?
- No. You can try any price, amount or bookmaker line without an account. You only need one when you decide to place a real trade, and our first-trade guide covers that.
- Are the prices in the calculators live?
- The examples start from real Polymarket markets at the time of the last update, and prices move all the time, so open the market for the current number. Anything you type yourself is calculated exactly as entered.
- Which calculator should I start with?
- Start with the Polymarket calculator if you want to know what an amount would return. If you think in American or decimal odds, use the odds converter. If you want to know what a trade costs, use the fee calculator. Fee rates in all three were last checked on 25 October 2026.