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Viscosity

ft²/stoin²/s

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

Factor1 ft²/s = 144 in²/s

Converter

ft²/s

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

Result
144in²/s

Rendered to 6 significant figures.

Formula

Formula
in²/s = ft²/s × 144

Multiply any value in square feet per second by 144 to obtain the value in square inches per second.

Worked example

Convert 1 ft²/s to in²/s.

  1. 01Start with 1 ft²/s.
  2. 02Multiply by the conversion factor: 1 × 144 = 144 in²/s.
Result1 ft²/s = 144 in²/s

Conversion table

ft²/sin²/s
1144
2288
5720
101440
202880
507200
10014400
20028800
50072000
10001.4400e+5

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ft²/s to in²/s?
1 ft²/s equals 144 in²/s. To convert, multiply the value in square feet per second by 144.
How do I convert 1 ft²/s to in²/s?
1 ft²/s = 144 in²/s. For any value, multiply by 144.
How do I convert in²/s back to ft²/s?
Divide by the same factor — or equivalently, multiply by 0.006944444. So 1 in²/s = 0.00694444 ft²/s.
When would I need to convert square foot per second to square inch per second?
Kinematic viscosity conversions between ft²/s and in²/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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