Each share resolves to $1 if your outcome wins and $0 if it loses. Your payout is the number of winning shares times $1. Profit is that payout minus what you paid (shares times entry price).
Polymarket Payout Calculator
Use this free Polymarket payout calculator to size a trade before you place it. Enter how much USDC you're staking, the entry price of your side, and the outcome — the calculator instantly estimates the shares you hold, your gross payout if you win, your profit and your ROI. It runs entirely in your browser, needs no signup, and models Polymarket's category-based taker fee curve so your estimate reflects what you'd actually net.
How the Polymarket payout calculator works
Shares
On Polymarket you buy shares of an outcome, each of which resolves to $1 if your side wins and $0 if it loses. The number of shares you get is your USDC stake divided by the price per share, so a cheaper entry price buys more shares for the same money.
Entry price (probability)
Entry price is the cost per share, a dollar value between $0.01 and $0.99, and it doubles as the market-implied probability. A $0.65 price means the market prices the outcome at roughly a 65% chance — and that $0.65 is what each share costs you.
Outcome (Yes / No)
Pick the side you're backing. The calculator pays out $1 per share on the side that resolves true and $0 on the side that resolves false, then nets out your cost and the applicable Polymarket fee for the market's category.
How Polymarket payouts are calculated
Example: a $0.40 "Yes" position. Say you stake $40 of USDC on "Yes" at an entry price of $0.40. That buys 100 shares ($40 ÷ $0.40). If "Yes" resolves true, those 100 shares pay out $100 (100 × $1). Your gross profit is $100 − $40 = $60, a 150% ROI before fees. Polymarket charges no fee on most markets, but on a category with a taker fee (the fee curve peaks around a 50¢ price), a small fee is deducted from that profit. If "Yes" resolves false, the shares are worth $0 and you lose your $40 stake.
Frequently asked questions
Shares = amount invested divided by the price per share. A $0.40 'Yes' price means $40 buys 100 shares, which pay out $100 if 'Yes' resolves true.
Yes. The calculator is completely free, requires no signup, and runs entirely in your browser.
Polymarket does not charge trading fees on most markets, so the estimate is your gross payout. Always confirm current fee terms on Polymarket before trading.
The entry price is the cost per share between $0.01 and $0.99, which also reflects the market-implied probability. A $0.65 price implies roughly a 65% chance the outcome resolves true.
No. This tool provides estimates for informational purposes only and is not financial, investment or trading advice.
Disclaimer
This calculator provides estimates for informational purposes only and is not financial, investment or trading advice. Fees, payouts and market rules can change — always confirm current terms on Polymarket before trading.