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Polymarket & Kalshi Profit and Payout Calculator

Calculate prediction-market payouts, fees, net profit, ROI and break-even for settlement or an early sale.

What would this trade pay?

Choose the outcome you buy. Its price is entered directly, including for NO.

Contract spend excludes fees. Use your expected average fill price to account for slippage. Kalshi estimates use whole contracts (fractional execution is outside this estimate); venue rounding and split fills can differ. Use manual fees for special schedules.

NET PROFIT / LOSS

$147.00

142.72% return on total outlay

Shares / contracts
250
Contract cost
$100.00
Entry fee
$3.00
Exit fee
$0.00
Other costs
$0.00
Gross payout / sale proceeds
$250.00
Total initial outlay
$103.00
Maximum loss on losing settlement
$103.00
Settlement break-even probability
41.20%

Preview updates as you type. This is a cost estimate, not a forecast of the outcome.

Schedule references checked 2026-11-09: Polymarket fees · Kalshi fee formula · Kalshi rounding by member type · Kalshi current market exceptions. Fees can change. Estimates assume one fill per leg and exclude taxes and rebates. The calculator does not place trades.

Kalshi profit calculator

Select the Kalshi schedule and enter your YES or NO purchase price. Match the maker or taker setting, series multiplier and balance precision to your account. Use manual fees when your order quote follows a different schedule.

Example: 100 contracts at 40¢ cost $40. With the general 0.07 taker coefficient and multiplier 1, the entry fee is $1.68. A winning settlement pays $100, leaving $58.32 profit before other costs. A losing settlement loses $41.68.

See the Kalshi fees and order guide for market exceptions and account details.

Polymarket profit calculator

Select Polymarket international and the market’s fee category. The presets estimate protocol trading fees; add builder, funding or other charges separately. Use manual fees for Polymarket US.

Example: 100 shares at 40¢ cost $40. A market using the 0.05 taker coefficient adds a $1.20 entry fee. A winning settlement pays $100, leaving $58.80 profit before other costs. A losing settlement loses $41.20. The break-even probability is 41.2%.

See the Polymarket fees and settlement guide for the distinction between international and US products.

Selling before settlement

Choose “Sell before settlement” and enter your expected average exit price. Sale proceeds equal shares multiplied by that price. Net profit subtracts the purchase cost, entry fee, exit fee and other costs. Use an expected fill price to account for slippage.

What the estimate covers

These examples assume one fill and a binary contract that pays $1 if your outcome wins, or zero if it loses. Kalshi split fills and rounding can change charges. The calculator excludes short sales, leverage, combos, taxes and rebates.

A 40¢ price implies roughly 40% probability before fees; it does not promise a 40% return. Use the odds converter to compare price and probability.