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Volumetric Flow Rate

cfstogal/day (US)

Convert cubic feet per second (cfs) to US gallons per day (gal/day (US)).

Factor1 cfs = 646316.9 gal/day (US)

Converter

cfs

Accepts numbers or expressions, e.g. 150 + 14.7

Result
646317gal/day (US)

Rendered to 6 significant figures.

Formula

Formula
gal/day (US) = cfs × 646316.9

Multiply any value in cubic feet per second by 646316.9 to obtain the value in US gallons per day.

Worked example

Convert 1 cfs to gal/day (US).

  1. 01Start with 1 cfs.
  2. 02Multiply by the conversion factor: 1 × 646316.9 = 646317 gal/day (US).
Result1 cfs = 646317 gal/day (US)

Conversion table

cfsgal/day (US)
16.4632e+5
21.2926e+6
53.2316e+6
106.4632e+6
201.2926e+7
503.2316e+7
1006.4632e+7
2001.2926e+8
5003.2316e+8
10006.4632e+8

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cfs to gal/day (US)?
1 cfs equals 646316.9 gal/day (US). To convert, multiply the value in cubic feet per second by 646316.9.
How do I convert 1 cfs to gal/day (US)?
1 cfs = 646317 gal/day (US). For any value, multiply by 646316.9.
How do I convert gal/day (US) back to cfs?
Divide by the same factor — or equivalently, multiply by 1.547229e-6. So 1 gal/day (US) = 1.54723e-6 cfs.
When would I need to convert cubic foot per second to US gallon per day?
Flow-rate conversions show up in pump curve interpretation, control valve sizing (Cv vs Kv), and aligning vendor specifications with process simulation outputs. cfs to gal/day (US) is a frequently needed conversion for flow datasheet preparation.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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