P&L CALCULATOR
Model any prediction market position — stake, entry price, target exit, and position type. Client-side only. No data leaves your browser.
How do you calculate prediction market profit?
Profit equals (exit price − entry price) × number of contracts, minus fees. Buying 100 YES contracts at $0.40 and settling at $1.00 returns $100 on a $40 stake, a $60 profit. Enter your stake, entry price, and exit below — nothing leaves your browser.
$0.65 → $1.00
65¢ YES, resolves YES = +54% return on stake
$0.65 → $0.00
65¢ YES, resolves NO = -100% stake (lose all)
Spread matters
Limit orders typically save 2-3¢ vs taking the market
Frequently asked questions
How do you calculate prediction market P&L?
Profit = (exit price − entry price) × shares. If you buy 100 YES shares at $0.65 and sell at $0.80, profit = ($0.80 − $0.65) × 100 = $15.
Does this calculator track real positions?
No — it's a stateless modeling tool. Nothing is stored, sent, or tracked. Run scenarios privately in your browser.
Does the fee structure differ by platform?
Yes. Kalshi charges 0.07 × contracts × price × (1 − price) on each executed trade, rounded up to the next cent. Polymarket US charges orders that fill straight away 0.0695 × contracts × price × (1 − price), and orders that rest on the book pay no fee. The calculator shows gross P&L, so subtract the fee the app shows.
21+ · T&Cs apply · Terms
Certain limitations apply. The offer is available to new users only, subject to the terms and conditions at kalshi.com/tc/500. 18+ only. Restrictions and eligibility requirements apply. Event contract trading involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information.