Kalshi's fees are small but they are not flat: they scale with how close the contract price is to 50 cents. This calculator estimates the trading fee on an order so you can see the cost before you trade.
Enter your contract price and quantity below. Note this is an estimate using Kalshi's standard taker-fee formula; Kalshi can change its schedule and some markets differ, so confirm on Kalshi's fee page.
ESTIMATED FEE
$1.75
1.75¢ per contract
COST TO ENTER
$50.00
TOTAL OUTLAY
$51.75
cost + fee
Estimate using Kalshi’s standard taker-fee formula (about 7% × price × (1 − price) per contract, rounded up). Kalshi can change fees and some markets differ. No fee is charged at settlement.
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Kalshi's trading fee is highest on contracts near 50 cents and shrinks toward the extremes (near 1 cent or 99 cents). The common formula for the taker fee is roughly 7% times price times (1 minus price) per contract, rounded up to the next cent.
Limit orders that rest on the book and are filled later are maker orders, which generally avoid this fee. That is why active traders favor limit orders.
Why it matters
Round-tripping (buying then selling before settlement) pays the fee twice, which can erase a thin edge. On coin-flip markets near 50 cents, the fee is at its peak, so a small edge there can be eaten entirely by costs.
FAQ
How much are Kalshi fees?
Small and variable. The taker fee scales with the contract price, peaking near 50 cents and shrinking toward the extremes, usually a couple of cents per contract at most. This calculator gives an estimate; check Kalshi for current figures.
How do I avoid Kalshi fees?
Use limit orders that rest on the order book. Such maker orders generally avoid the trading fee that immediate taker orders pay. There is also no fee at settlement.
Is this fee calculator exact?
It is an estimate based on Kalshi's standard taker-fee formula. Kalshi can change its fee schedule and some markets use different rates, so confirm on Kalshi's fee page before relying on it.
Stop calculating one trade at a time
ContractTax does this across your whole Kalshi history: real P&L, a Sharp Score that rates your edge, and your tax numbers under every treatment.
These tools are for education and estimation only, not financial or tax advice. Fee estimates use Kalshi’s standard formula and may differ from your actual fees.
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