Profit/Loss Calculator
Enter your side, entry price, number of shares, and outcome to see exact profit or loss including fees.
Total Cost
$50.00
Gross Payout
$100.00
Fee Paid
$1.25
Net Profit/Loss
+$48.75
ROI
+97.5%
Math Breakdown
Side: Buy Yes @ $0.50
Buy price per share (p): $0.50
Total cost: 100 shares × $0.50 = $50.00
Gross payout: 100 shares × $1.00 = $100.00
Fee calculation (Taker):
fee = 100 × 0.05 × 0.50 × (1 − 0.50)
fee = 100 × 0.05 × 0.2500
fee = $1.25000
Net profit: $100.00 - $50.00 - $1.25 = +$48.75
ROI: +48.75 / 50.00 × 100 = +97.5%
Breakeven price: $0.5125 per share
Sports markets: feeRate = 0.05. Fee formula: fee = shares × 0.05 × p × (1 - p).
How Polymarket Profit Works
Every trade has a binary outcome: a winning share pays $1.00; a losing share pays $0.00. Your profit or loss is the payout minus your cost and any taker fee.
Buying Yes vs Buying No
You can profit in either direction. Buying Yes at $0.60 is economically the same as selling No at $0.40. Select “Buy No” if you expect the outcome not to happen.