FanDuel API
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FanDuel parlay calculator

A FanDuel parlay return is the stake multiplied by every active leg’s decimal price. Voided legs are removed; if all are voided, the modeled stake is refunded. An optional Boost Builder percentage increases profit only. This tool uses independent selections, not the correlated pricing of a Same Game Parlay.

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Your inputs

Calculated result

Total return
$69.58
Net profit
$59.58
Boosted decimal odds
6.9579
Boosted American odds
595.7926
Show the working

Total return
10 × [1 + (6.957926 − 1) × (1 + 0)]

Net profit
Total return − stake

Boosted decimal odds
1 + original profit multiple × (1 + boost)

Boosted American odds
Convert boosted decimal odds to American

Formula and worked example

Return = stake × [1 + (product of active decimal prices − 1) × (1 + boost)].

Three −110 legs return $69.58 on $10 before a boost. A 25% profit boost increases total return to $84.47.

Default example outputValue
Total return$69.5793
Net profit$59.5793
Boosted decimal odds6.9579
Boosted American odds595.7926

Boost Builder basics require at least three eligible active legs at −400 or longer. SGPs and straight bets are excluded. Token-specific terms determine availability.

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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