Kalshi vs Polymarket fee calculator
The taker fee for the same trade on three platforms: polymarket.com, where the rate depends on the market category, Polymarket US, where it depends on your 30-day volume, and Kalshi. All three charge rate × contracts × p × (1 − p), so the fee as a percent of what you pay changes with the price.
Your trade
Fee on 100 contracts, by price
| Price paid | polymarket.com, Crypto (0.07) | polymarket.com, Finance and others (0.04) | Polymarket US, Under $10K (Θ 0.095) | Polymarket US, $250K and above (Θ 0.0695) | Kalshi (multiplier 1) |
|---|---|---|---|---|---|
| 5¢ | $0.33 (6.65%) | $0.19 (3.80%) | $0.45 (9.00%) | $0.33 (6.60%) | $0.34 (6.80%) |
| 10¢ | $0.63 (6.30%) | $0.36 (3.60%) | $0.86 (8.60%) | $0.63 (6.30%) | $0.63 (6.30%) |
| 25¢ | $1.31 (5.25%) | $0.75 (3.00%) | $1.78 (7.12%) | $1.30 (5.20%) | $1.32 (5.28%) |
| 50¢ | $1.75 (3.50%) | $1.00 (2.00%) | $2.38 (4.76%) | $1.74 (3.48%) | $1.75 (3.50%) |
| 75¢ | $1.31 (1.75%) | $0.75 (1.00%) | $1.78 (2.37%) | $1.30 (1.73%) | $1.32 (1.76%) |
| 90¢ | $0.63 (0.70%) | $0.36 (0.40%) | $0.86 (0.96%) | $0.63 (0.70%) | $0.63 (0.70%) |
| 95¢ | $0.33 (0.35%) | $0.19 (0.20%) | $0.45 (0.47%) | $0.33 (0.35%) | $0.34 (0.36%) |
Dollar fee, with the fee as a percent of trade value at the price in the row.
Where the rates come from
- polymarket.com: docs.polymarket.com/trading/fees, checked Nov 8, 2026. Fees are rounded to 5 decimals (minimum 0.00001 USDC).
- Polymarket US: docs.polymarket.us/fees, tiers effective Nov 6, 2026, checked Nov 8, 2026. Rounded to the nearest $0.01 with banker's rounding (half to even).
- Kalshi: kalshi.com/docs/kalshi-fee-schedule.pdf, fee schedule dated Jul 7, 2026, checked Nov 8, 2026. Retail accounts are rounded up to the cent per order; direct members to $0.0001. (rounding rules)
Every rate on this page comes from one file that we update from those pages. The breakdown of how the fee curve works, with maker rebates and the Polymarket US tiers, is in how Polymarket fees work. For break-even and selling before resolution on polymarket.com, use the Polymarket fee calculator.
Questions
Is Kalshi or Polymarket cheaper?
It depends on which Polymarket. On polymarket.com the rate depends on the market category, from 0.07 down to 0, and 11 of 12 categories are below Kalshi's standard 0.07. On Polymarket US the coefficient Θ runs from 0.095 to 0.0695 by 30-day taker volume, so accounts under $250K pay more than on Kalshi once their first 7 days are over. At 50¢ that is 4.75% of trade value on Polymarket US under $10K against 3.50% on Kalshi, before rounding. The table rounds each fee the way the platform does, so its percentages can differ slightly.
Why do all three platforms charge the most at 50¢?
polymarket.com, Polymarket US and Kalshi all multiply contracts × p × (1 − p) by a rate. That term peaks at 50¢. Measured against the money you put in, the fee is rate × (1 − p), so a 10¢ contract costs about nine times as much per dollar as a 90¢ contract.
Does it matter whether I buy Yes or No?
Only through the price. Buying No at a Yes price of 30¢ means paying 70¢ per contract, and the fee is charged on that price. The fee in dollars is the same either way, but as a percent of trade value it is lower on the expensive side.
What is the Kalshi series multiplier?
Kalshi multiplies its 0.07 rate by a per-series multiplier, usually 1 and on some series 0.5 or 0. Kalshi rounds the fee up to the next cent per order, which makes small orders relatively expensive: a single contract at 50¢ pays 2¢, or 4% of trade value at 50¢.
Do makers pay fees?
Makers pay no fee on polymarket.com or Polymarket US. On Kalshi, makers pay a fee only on series listed with maker fees. This calculator shows taker fees, for orders that fill against the book.
Related: maker and taker fees.