FanDuel API
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FanDuel no-vig calculator

Remove margin from a complete FanDuel market by converting each price to implied probability and dividing each probability by their sum. The normalized probabilities total 100%. This is proportional margin removal; it describes a market-based model, not a verified forecast. Include every mutually exclusive outcome, including a draw when one is offered.

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Your inputs

Calculated result

Outcome 1 fair probability
50%
Outcome 2 fair probability
50%
Show the working

Outcome 1 fair probability
(1 ÷ 1.909091) ÷ 1.047619 × 100

Outcome 2 fair probability
(1 ÷ 1.909091) ÷ 1.047619 × 100

Formula and worked example

Fair probabilityᵢ = (1/decimalᵢ) ÷ sum(1/decimal).

A −110/−110 two-way market becomes 50%/50% after proportional margin removal.

Default example outputValue
Outcome 1 fair probability50%
Outcome 2 fair probability50%

Missing an outcome or mixing different lines makes the normalization misleading. Other margin-removal methods can produce different estimates.

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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