Square Foot/Second to Square Inch/Second Converter

Kinematic Viscosity Converter

6 units available

Decimals:

From

To

144

1 ft²/s = 144 in²/s

Formula:

in²/s = ft²/s × 144

With your value: 1 ft²/s = 144 in²/s

Other Square Foot/Second to Square Inch/Second conversions

2 ft²/s to in²/s 3 ft²/s to in²/s 4 ft²/s to in²/s 5 ft²/s to in²/s 6 ft²/s to in²/s 7 ft²/s to in²/s 8 ft²/s to in²/s

Square Foot/Second to Square Inch/Second Conversion Table

Square Foot/Second (ft²/s)	Square Inch/Second (in²/s)
0.5	72
1	144
2	288
5	720
10	1,440
15	2,160
20	2,880
25	3,600
50	7,200
100	14,400
250	36,000
500	72,000
1000	144,000

Square Inch/Second to Square Foot/Second Conversion Table

Square Inch/Second (in²/s)	Square Foot/Second (ft²/s)
0.5	0.003472
1	0.006944
2	0.013889
5	0.034722
10	0.069444
15	0.104167
20	0.138889
25	0.173611
50	0.347222
100	0.694444
250	1.736111
500	3.472222
1000	6.944444

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Square Foot/Second (ft²/s)

Kinematic Viscosity

Exact conversion

Derived quantity, square metre per second (m²/s). The stokes is exactly 10⁻⁴ m²/s by CGS definition.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Square Inch/Second (in²/s)

Kinematic Viscosity

Exact conversion

Derived quantity, square metre per second (m²/s). The stokes is exactly 10⁻⁴ m²/s by CGS definition.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Square Foot/Second to Square Inch/Second

To convert from Square Foot/Second (ft²/s) to Square Inch/Second (in²/s), multiply the value by 144.

Formula: in²/s = ft²/s × 144

Reverse: ft²/s = in²/s × 0.0069444444

Step-by-Step Example

Start with your value in Square Foot/Second. For example: 5 ft²/s
Multiply by the conversion factor: 5 x 144
The result is: 720 in²/s

About Square Foot/Second

The square foot/second (ft²/s) is a unit of kinematic viscosity. One square foot/second equals 0.09290304 base units. UnitConvertLab converts it against every other kinematic viscosity unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: kinematic viscosity calculations, engineering and science, education.

About Square Inch/Second

The square inch/second (in²/s) is a unit of kinematic viscosity. One square inch/second equals 0.00064516 base units. UnitConvertLab converts it against every other kinematic viscosity unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: kinematic viscosity calculations, engineering and science, education.

Frequently Asked Questions

How many Square Inch/Second are in 1 Square Foot/Second?

There are exactly 144 Square Inch/Second in 1 Square Foot/Second. This means the conversion factor from Square Foot/Second to Square Inch/Second is 144.

What is the formula to convert Square Foot/Second to Square Inch/Second?

The formula to convert Square Foot/Second to Square Inch/Second is: in²/s = ft²/s × 144. For example, to convert 10 Square Foot/Second to Square Inch/Second, you would multiply 10 by 144.

What is a Square Foot/Second?