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Kinematic Viscosity Converter (m²/s / cSt / ft²/s)

· Last updated：2026-07-27

Convert kinematic viscosity (ν = dynamic viscosity / density) between m²/s (square metres per second, SI base), cSt (centistokes, 1 cSt = 1e-6 m²/s = 1 mm²/s), and ft²/s (square feet per second, 1 = 0.09290304 m²/s). Converts via m²/s to the target unit and also lists the equivalent value in all three units for reference. Reference values: water 20°C ≈ 1.004 cSt, SAE 30 oil ≈ 300–400 cSt at 40°C.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert non-negative kinematic viscosity values between m²/s, cSt, and ft²/s. Enter a value, choose the input and output units, and receive the converted result plus equivalent values in all three units.

When to use

  • Convert laboratory or engineering viscosity measurements between SI, centistokes, and imperial units.
  • Compare lubricant or fluid specifications reported in different kinematic viscosity units.
  • Standardize viscosity values for fluid mechanics calculations and technical reports.

How it works

  1. 1Enter a non-negative kinematic viscosity value.
  2. 2Select the input unit: m²/s, cSt, or ft²/s.
  3. 3Choose the output unit and set the number of decimal places from 0 to 10.
  4. 4The converter calculates through m²/s and returns the selected result with equivalents in all three units.

Use cases

  • Convert lubricant viscosity specifications between cSt and SI units.
  • Translate fluid property data between metric and imperial engineering references.
  • Check equivalent viscosity values when reviewing laboratory measurements or equipment documentation.

Examples

1. Convert light lubricating oil from cSt to SI units

Lubrication engineer

Background

A lubrication engineer has a kinematic viscosity reading of 100 cSt and needs the equivalent SI value for a technical calculation.

Problem

The oil specification is reported in cSt, while the calculation uses m²/s.

How to use

Enter 100 as the value, select cSt as the input unit, choose m²/s as the output unit, and use 6 decimal places.

Outcome

The result is 0.0001 m²/s. The reference values are 100 cSt and approximately 0.001076 ft²/s.

2. Convert an imperial viscosity value to metric units

Fluid systems technician

Background

A technician is reviewing a heavy gear-oil specification listed as 1 ft²/s.

Problem

The value must be compared with metric viscosity data in m²/s and cSt.

How to use

Enter 1 as the value, select ft²/s as the input unit, choose m²/s as the output unit, and set 6 decimal places.

Outcome

The result is 0.092903 m²/s, equivalent to 92903.04 cSt and 1 ft²/s.

FAQ

Which kinematic viscosity units are supported?

The converter supports m²/s, cSt, and ft²/s.

What value can I enter?

Enter a non-negative numeric kinematic viscosity value.

How is cSt related to m²/s?

1 cSt equals 1e-6 m²/s, which is also 1 mm²/s.

How is ft²/s converted to m²/s?

1 ft²/s equals 0.09290304 m²/s.

Can I control the displayed precision?

Yes. Set decimal places from 0 to 10; the default is 6.

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