Kalshi Combo Builder
Build multi-leg Kalshi combos and instantly calculate combined probability, cost, payout multiplier, and break-even hit rate.
FREE · FAN FAVORITE
Chain multiple Kalshi markets together like a parlay
What is this?
Think of Kalshi Combos like parlays in sports betting — you link multiple YES/NO predictions together and the payout multiplies. But unlike sportsbook parlays, there's no built-in house juice destroying the odds.
The Combo Builder calculates the exact probability and payout of any multi-leg Kalshi position instantly, so you know if you're getting a fair deal or leaving money on the table.
Real-World Example
→ Your 3-Leg Combo
You want to combine: (1) "Brazil makes the World Cup Final" at 35¢, (2) "Mbappé scores in the tournament" at 72¢, and (3) "Over 2.5 goals in the WC Final" at 58¢.
Combo Builder multiplies it out: 0.35 × 0.72 × 0.58 = 14.6% true probability. A fair price would be 14.6¢. If Kalshi is offering it at 10¢ — that's a mispriced combo in your favor.
✅Action: Build 3-leg combos. Compare the offered price to the calculated fair value. Only play if the offered price is lower.
Bottom line: If Kalshi's combo price is LOWER than your calculated fair value, you have an edge. This tool shows you which combos are mispriced.
Full guide →Combo Legs (2/4)
Combined Prob
42.0%
Cost
42.0¢
Payout Mult.
2.38x
Break-Even
42.0%
How Kalshi Combos Work
A Kalshi combo (also called a multi-leg or parlay) lets you tie multiple prediction market contracts together so that all legs must resolve in your favor for the combo to pay out. The math is straightforward: each leg's implied probability gets multiplied together to produce the combined probability. A two-leg combo of 70¢ and 65¢ contracts has a combined probability of 0.70 × 0.65 = 45.5%, which means you'd pay roughly 45.5¢ and receive $1.00 if both legs hit.
The appeal of combos is the payout multiplier. Because you're accepting a lower win probability, your effective payout increases dramatically. A four-leg combo of fairly-priced 60¢ contracts would cost about 13¢ and return $1.00 — a 7.7x payout. This compresses your required capital while amplifying upside. The key question sharp bettors always ask is whether the combo is positive expected value (EV) — do the combined fair probabilities justify the combo price?
Unlike sportsbook parlays, Kalshi combos do not charge additional vig per leg. Each leg's pricing already embeds the platform's edge. This makes Kalshi combos structurally more transparent than traditional parlay products and is one of the reasons experienced DFS and sports bettors are migrating toward prediction market platforms for high-upside plays.
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