Free tool
Prediction market profit calculator
Enter a contract price and your stake to see exactly how many shares you get, your total payout, your profit if you win, and your ROI — for either side of any market.
If your side wins
Estimates for education only. Real platform fees vary and may be calculated differently; check your platform’s fee schedule. This tool stores nothing and sends nothing anywhere.
How the maths works
A Yes or No share that costs p cents pays out $1 if your side wins and $0 if it loses. So a stake of S dollars buys S ÷ (p/100) shares, and each one returns a dollar on a win. Your profit is the payout minus your stake; your loss, if it goes the other way, is the stake itself. The price in cents doubles as the implied probability and as your break-even win rate — pay 64¢ and you need the outcome to happen more than 64% of the time to profit over the long run.
Want to convert that price into decimal, fractional or American odds? Use the odds converter. New to the concept? Start with what are prediction markets.
Now find the right platform
You've run the numbers — see which regulated exchange fits the markets you want to trade.
Independent · No platform pays for placement · 18+ only