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Viscosity

in²/stoft²/s

Convert square inches per second (in²/s) to square feet per second (ft²/s).

Factor1 in²/s = 0.006944444 ft²/s

Converter

in²/s

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

Result
1ft²/s

Rendered to 6 significant figures.

Formula

Formula
ft²/s = in²/s × 0.006944444

Multiply any value in square inches per second by 0.006944444 to obtain the value in square feet per second.

Worked example

Convert 144 in²/s to ft²/s.

  1. 01Start with 144 in²/s.
  2. 02Multiply by the conversion factor: 144 × 0.006944444 = 1 ft²/s.
Result144 in²/s = 1 ft²/s

Conversion table

in²/sft²/s
10.0069444
20.013889
50.034722
100.069444
200.13889
500.34722
1000.69444
2001.3889
5003.4722
10006.9444

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from in²/s to ft²/s?
1 in²/s equals 0.006944444 ft²/s. To convert, multiply the value in square inches per second by 0.006944444.
How do I convert 1 in²/s to ft²/s?
1 in²/s = 0.00694444 ft²/s. For any value, multiply by 0.006944444.
How do I convert ft²/s back to in²/s?
Divide by the same factor — or equivalently, multiply by 144. So 1 ft²/s = 144 in²/s.
When would I need to convert square inch per second to square foot per second?
Kinematic viscosity conversions between in²/s and ft²/s arise in hydraulic fluid selection, lubricant grading (ISO VG), pipe flow Reynolds number calculations, and fuel-oil specification. Kinematic viscosity equals dynamic viscosity divided by fluid density and cannot be directly compared to dynamic viscosity without that context.
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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