Kalshi combo calculator: what a Kalshi parlay pays, after the fee
A Kalshi combo is a parlay sold as one contract: it pays $1 if every leg wins and nothing otherwise. Enter each leg’s price in cents to see what the combo is worth, Kalshi’s fee on it, the payout, and the American odds it equals.
An estimate from the legs’ prices: Kalshi’s market makers quote each combo on request. On the one real 3-leg combo we checked (October 24, 2026), this method landed within 1.7% of the quote. Fees from Kalshi’s fee schedule, checked November 14, 2026.
Kalshi combo payout by number of legs
Every leg at 50¢, an even-money price before the fee, next to a sportsbook parlay with every leg at −110.
| Legs | Combo price | Odds before fee | Odds after fee | $100 returns on Kalshi | $100 returns at −110 a leg |
|---|---|---|---|---|---|
| 2 | 25¢ | +300 | +280 | $380 | $364 |
| 3 | 12.5¢ | +700 | +654 | $754 | $696 |
| 4 | 6.25¢ | +1500 | +1401 | $1,501 | $1,328 |
| 5 | 3.13¢ | +3100 | +2897 | $2,997 | $2,536 |
| 6 | 1.56¢ | +6300 | +5887 | $5,987 | $4,841 |
| 7 | 0.78¢ | +12700 | +11869 | $11,969 | $9,242 |
| 8 | 0.39¢ | +25500 | +23831 | $23,931 | $17,645 |
A leg both sides see as a coin flip usually costs 51¢ or 52¢ to buy, not 50¢, so real combos pay a little less than this table. To price real games, build the slip in the parlay calculator: it shows the same parlay at every sportsbook, Kalshi and Polymarket.
How Kalshi charges the fee on a combo
Once, on the combo’s own price. The formula is the one every Kalshi trade uses, 0.07 × price × (1 − price) a contract, rounded up to the next cent for the order. Multiplying each leg’s after-fee price together would charge the fee three times on a three-leg combo and understate the payout by about 5%.
| Combo price | Kalshi taker fee, 100 contracts | Kalshi maker fee | Odds after taker fee | Polymarket US combo fee, Tier 1 | Polymarket US combo fee, Tier 4 |
|---|---|---|---|---|---|
| 5¢ | $0.34 | $0.17 | +1775 | $0.70 | $0.57 |
| 10¢ | $0.63 | $0.32 | +841 | $1.25 | $1.02 |
| 15¢ | $0.90 | $0.45 | +529 | $1.68 | $1.36 |
| 20¢ | $1.12 | $0.56 | +373 | $2.01 | $1.60 |
| 25¢ | $1.32 | $0.66 | +280 | $2.26 | $1.78 |
| 30¢ | $1.47 | $0.74 | +218 | $2.43 | $1.89 |
| 35¢ | $1.60 | $0.80 | +173 | $2.54 | $1.96 |
| 40¢ | $1.68 | $0.84 | +140 | $2.59 | $1.98 |
| 45¢ | $1.74 | $0.87 | +114 | $2.60 | $1.97 |
| 50¢ | $1.75 | $0.88 | -107 | $2.56 | $1.92 |
| 55¢ | $1.74 | $0.87 | -131 | $2.49 | $1.86 |
| 60¢ | $1.68 | $0.84 | -161 | $2.37 | $1.76 |
| 65¢ | $1.60 | $0.80 | -199 | $2.22 | $1.64 |
| 70¢ | $1.47 | $0.74 | -251 | $2.03 | $1.49 |
| 75¢ | $1.32 | $0.66 | -322 | $1.80 | $1.32 |
| 80¢ | $1.12 | $0.56 | -430 | $1.53 | $1.12 |
| 85¢ | $0.90 | $0.45 | -609 | $1.21 | $0.89 |
| 90¢ | $0.63 | $0.32 | -967 | $0.86 | $0.63 |
| 95¢ | $0.34 | $0.17 | -2042 | $0.45 | $0.33 |
Polymarket US prices combos on a steeper curve than its single markets; the Polymarket fee calculator has the formula and every tier.
Kalshi combo questions
Can you parlay on Kalshi?
Yes. Kalshi calls a parlay a combo: one contract that pays $1 only if every leg wins. You pick the legs, market makers quote a price for that exact combination, and you buy it like any other contract.
How is a Kalshi combo priced?
Close to the product of its legs. Legs at 60¢, 55¢ and 48¢ multiply to about 15.8¢, or +531 before the fee. The real price is a quote from market makers, so it can sit a little above or below that.
What is the fee on a Kalshi combo?
The same formula as any Kalshi trade, charged once on the combo’s price and not on each leg: 0.07 × contracts × price × (1 − price), rounded up to the next cent for the order. 100 combo contracts at 25¢ cost $1.32 in fees. A resting (maker) order on a combo pays half the taker fee, except on NFL combos whose legs are uncorrelated.
Does a Kalshi combo pay more than a sportsbook parlay?
It depends on the legs. Three even-money legs at 50¢ return about $754 on $100 after Kalshi’s fee; a sportsbook that prices each leg at −110 returns $696. But a 50/50 game usually costs 51¢ or 52¢ a side on Kalshi, and each cent compounds across legs. Price your own slip both ways before you bet it.
How do Polymarket US combo fees compare?
Polymarket US charges combos on a steeper curve: price × [rate × (1 − price) + 0.06 × (1 − price)^4] a contract. 100 combo contracts at 25¢ cost $2.26 at its Tier 1 rate, against $1.32 on Kalshi.
Related: Kalshi fee calculator · Kalshi odds converter · Kalshi vs sportsbooks · Kalshi vs DraftKings · Kalshi vs FanDuel · Parlay calculator
What is Oddy?
Oddy shows what every regulated sportsbook and prediction market pays for the same bet, ranked, with a link to the best price. Prices refresh every 5 minutes before a game; once it starts, Kalshi and Polymarket are re-read every 5 seconds from their own APIs (how Oddy works). Free, no account, and we never sell picks.