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Volumetric Flow Rate

gal/day (US)tocfs

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

Factor1 gal/day (US) = 1.547229e-6 cfs

Converter

gal/day (US)

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

Result
1.54723cfs

Rendered to 6 significant figures.

Formula

Formula
cfs = gal/day (US) × 1.547229e-6

Multiply any value in US gallons per day by 1.547229e-6 to obtain the value in cubic feet per second.

Worked example

Convert 1.00000e+6 gal/day (US) to cfs.

  1. 01Start with 1.00000e+6 gal/day (US).
  2. 02Multiply by the conversion factor: 1.00000e+6 × 1.547229e-6 = 1.54723 cfs.
Result1.00000e+6 gal/day (US) = 1.54723 cfs

Conversion table

gal/day (US)cfs
11.5472e-6
23.0945e-6
57.7361e-6
101.5472e-5
203.0945e-5
507.7361e-5
1000.00015472
2000.00030945
5000.00077361
10000.0015472

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gal/day (US) to cfs?
1 gal/day (US) equals 1.547229e-6 cfs. To convert, multiply the value in US gallons per day by 1.547229e-6.
How do I convert 1 gal/day (US) to cfs?
1 gal/day (US) = 1.54723e-6 cfs. For any value, multiply by 1.547229e-6.
How do I convert cfs back to gal/day (US)?
Divide by the same factor — or equivalently, multiply by 646316.9. So 1 cfs = 646317 gal/day (US).
When would I need to convert US gallon per day to cubic foot per second?
Flow-rate conversions show up in pump curve interpretation, control valve sizing (Cv vs Kv), and aligning vendor specifications with process simulation outputs. gal/day (US) to cfs 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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