Kalshi charges one fee on its daily high-temperature markets: the taker fee, 0.07 × contracts × price × (1 − price), rounded up to the next cent, on every order that trades against one already on the book. There is no maker fee and no settlement fee on these series.
Kalshi Fee Schedule effective Feb 5, 2026; each series' fee fields checked Oct 21, 2026.
Fee = 7% × contracts × price × (1 − price), rounded up to the cent, per order. No maker or settlement fee on these series.
| Order | Before rounding | Fee | Breaks even |
|---|---|---|---|
| 1 @ 54¢ | 1.7388¢ | $0.02 | 56% |
| 100 @ 54¢ | 173.88¢ | $1.74 | 55.74% |
| 1 @ 5¢ | 0.3325¢ | $0.01 | 6% |
| 10 @ 5¢ | 3.325¢ | $0.04 | 5.40% |
Source: Kalshi Fee Schedule, effective Feb 5, 2026; every daily-high series reports fee type "quadratic", multiplier 1 (Kalshi API)
One contract at 54¢: 0.07 × 0.54 × 0.46 = 1.7388¢, rounded up to 2¢. It costs 56¢ and pays 100¢ if it settles your way, so it breaks even at a 56% chance, not 54%. In one order of 100 the fee is 173.88¢, rounded up to $1.74: 1.74¢ a contract, breaking even at 55.74%.
| Price | 1 contract | 10 in one order | 100 in one order |
|---|---|---|---|
| 5¢ | 1.00¢ each · 6% | 0.40¢ each · 5.40% | 0.34¢ each · 5.34% |
| 20¢ | 2.00¢ each · 22% | 1.20¢ each · 21.20% | 1.12¢ each · 21.12% |
| 35¢ | 2.00¢ each · 37% | 1.60¢ each · 36.60% | 1.60¢ each · 36.60% |
| 50¢ | 2.00¢ each · 52% | 1.80¢ each · 51.80% | 1.75¢ each · 51.75% |
| 54¢ | 2.00¢ each · 56% | 1.80¢ each · 55.80% | 1.74¢ each · 55.74% |
| 65¢ | 2.00¢ each · 67% | 1.60¢ each · 66.60% | 1.60¢ each · 66.60% |
| 80¢ | 2.00¢ each · 82% | 1.20¢ each · 81.20% | 1.12¢ each · 81.12% |
| 95¢ | 1.00¢ each · 96% | 0.40¢ each · 95.40% | 0.34¢ each · 95.34% |
The fee per contract and the break-even chance, by price and order size, from the fee schedule's formula.
Polymarket charges its weather markets' takers 0.05 × shares × price × (1 − price), in USDC to $0.00001, with no rounding up to the cent and nothing for makers. The calculator above works out either exchange. Here are both fees on 100 at each price:
| Price | Kalshi, 100 contracts | Polymarket, 100 shares |
|---|---|---|
| 10¢ | $0.63 | $0.45 |
| 30¢ | $1.47 | $1.05 |
| 50¢ | $1.75 | $1.25 |
| 70¢ | $1.47 | $1.05 |
| 90¢ | $0.63 | $0.45 |
Source: Polymarket documentation: fees; Kalshi Fee Schedule (effective Feb 5, 2026)
Kalshi's API documentation adds how the rounding is carried out: fees are worked out per fill to $0.000001, and a rounding charge keeps each account's balance to $0.0001 for direct members or to $0.01 for accounts cleared through a futures commission merchant, carried across all the fills of one order. On an account kept to $0.0001 the round-up may be smaller than the whole cent shown here. Almanac can't see accounts: a filled order's fee on your statement is the final word.
Taker fee = 0.07 × contracts × price × (1 − price), rounded up to the next cent, per order. These series charge no maker fee and no settlement fee.
About 56% for one contract. The fee is 0.07 × 0.54 × 0.46 = $0.0174, rounded up to $0.02, so the contract costs $0.56 and pays $1 if it settles your way: 56%. Bought 100 at a time, the fee is $1.74 and the break-even is 55.74%.
Because each order's fee rounds up to a whole cent: one contract at 5¢ pays $0.01, 20% of its price, so it needs a 6% chance to break even, not 5%. One order of 100 pays $0.34, 0.34¢ a contract.
Yes, under the fee schedule's formula. 100 contracts at 54¢ in one order pay $1.74 in fees; the same 100 as single-contract orders pay $2.00, $0.26 more.
Not on these markets. Every daily-high series reports Kalshi's "quadratic" fee type with a multiplier of 1, none is listed for maker fees, and there is no settlement fee.
Taker fee = 0.05 × shares × price × (1 − price), charged in USDC and rounded to $0.00001, only to the side that takes a resting order; makers pay nothing. 100 shares at 30¢ pay $1.05; it is largest at 50¢, $1.25 per 100 shares.
On the same order, Polymarket's weather fee works out lower: its rate is 5% against Kalshi's 7%, and it isn't rounded up to a whole cent. 100 at 54¢: $1.74 at Kalshi, $1.24 at Polymarket. Neither charges the side whose order was resting.
Source: Kalshi Fee Schedule (effective Feb 5, 2026); One series' fee fields, Kalshi's public API (New York City)
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