Prediction Market Odds Calculator
Turn Kalshi, Polymarket and sportsbook odds into probability
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Free, in-browser calculator: turn contract prices, American, decimal or fractional odds into implied probability, and see expected value after fees. Part of a free directory of open-source Kalshi and Polymarket bots and tools. No signup.
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PH · launched Oct 23, 2026 · 1 upvote (top 67%)
- Fintech
- Analytics & BI
- B2C
- Not AI
- Commercial product
- Open Source
- Fintech
- Developer Tools
Similar launches
See all 289 similar launches →Could you build this?
Yes Converting prices and odds into implied probability and expected value is simple arithmetic that a calculator page can implement directly.
Competitors
Other products that read as similar to this one : 289 launches clear the similarity bar, closest 8 shown.
Attention rank: #87 of 290 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 359 days after the earliest competitor.
- kalshi-trading-bot · github · 2026-09-15 · 40 upvotes · similarity 0.59
- kalshi-trading-bot · github · 2026-09-17 · 51 upvotes · similarity 0.59
- ArbTrader · ph · 2026-10-29 · 1 upvotes · similarity 0.58
- GhostLeg · ph · 2026-09-16 · 3 upvotes · similarity 0.54
- prediction-market-arbitrage-trading-bot · github · 2026-09-27 · 25 upvotes · similarity 0.54
- Predictefy · ph · 2026-09-30 · 1 upvotes · similarity 0.52
- Layer · hn · 2026-10-08 · 5 upvotes · similarity 0.51
- racinglines · ph · 2026-10-26 · 1 upvotes · similarity 0.50