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FanDuel odds converter

Convert a FanDuel American price into decimal odds and implied probability. For positive odds, divide by 100 and add one; for negative odds, divide 100 by the absolute price and add one. Implied probability is one divided by decimal odds. It includes the market margin and is not a prediction.

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Language: English

Your inputs

Calculated result

Implied probability
33.33%
Decimal odds
3
American odds
200
Show the working

Implied probability
100 ÷ 3

Decimal odds
Total return per unit staked

American odds
(3 − 1) × 100

Formula and worked example

d = 1 + A/100 for positive odds; d = 1 + 100/|A| for negative odds. Implied probability = 1/d.

+200 is decimal 3.0 and implies 33.33%. −110 is decimal 1.9091 and implies 52.38%.

Default example outputValue
Implied probability33.3333%
Decimal odds3
American odds200

Use the no-vig calculator to normalize a complete set of outcome prices. A price’s implied probability is not the same as its true win probability.

Rules reference: FanDuel’s published guidance, reviewed November 6, 2026. Mathematical model shown above; actual offer terms take precedence.

Use the market data in your app

Read game market prices through GET /api/v1/markets and player props through GET /api/v1/props. The API reference describes available fields, filters and data access.

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Educational calculations only. Responsible gambling resources.

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