Polymarket profit calculator
Estimate your profit, ROI, and fees on any Polymarket trade. Plug in your buy price, your sell or resolution price, and the number of shares.
Assumes a buy + sell roundtrip ($0.05 Turnkey signing on each). If you hold to resolution and claim the payout, that's one signature instead of two — subtract $0.05.
How profit calculation works
On Polymarket, shares trade between $0.01 and $0.99. If your prediction is correct, each share resolves to $1.00. Your profit is the difference between the resolution price and your entry price, multiplied by the number of shares — minus fees.
The math
- Total cost = buy price × shares
- Revenue = sell or resolution price × shares
- Gross profit = revenue − total cost
- Net profit = gross profit − Mirrored fee − Turnkey signing fee
- ROI = net profit ÷ total cost × 100
Example: buying at $0.35
You buy 100 YES shares at $0.35 — total cost $35.00. The market resolves YES, so each share pays $1.00 and your revenue is $100.00. Gross profit is $65.00. Mirrored takes 1% of that ($0.65), Turnkey signing runs ~$0.10 round-trip, so your net profit is roughly $64.25 — about +183.6% ROI on your $35 stake.
Understanding Mirrored fees
Mirrored only takes a fee when you win. The fee is 1% of gross profit — not of revenue, not of the trade size. If you lose, Mirrored takes nothing.
Each on-chain trade also incurs a flat $0.05 Turnkey signing fee, paid directly to Turnkey for the wallet signature. There's no subscription, no signup fee, no spread markup, and no withdrawal fee.
Quick reference
| Mirrored fee | 1% of gross profit on winning trades. $0 on losing trades. |
| Turnkey signing fee | $0.05 per on-chain transaction (typically 2 per roundtrip). |
| Minimum trade size | $1.10 |
| Subscription / signup fee | None. |