Physics

Instant, private, and free

Poise–Stokes Converter.

Convert dynamic viscosity and density to kinematic viscosity.

On-device calculationNo signup

Set your values

Results update as you type.

02 / ANSWER

Dynamic viscosity

Density

Kinematic viscosity

0.000000m²/s

Dynamic viscosity

0.000000cP

Kinematic viscosity

0.000000cSt

Results update automatically as you type.

Use Cases

Fluid Mechanics Calculations

Engineers and students can quickly convert dynamic viscosity and density to kinematic viscosity for analyzing fluid flow in pipes, channels, or around objects.

Example: For oil with dynamic viscosity 0.1 Pa·s and density 900 kg/m³, kinematic viscosity = 0.1 / 900 = 0.000111 m²/s = 1.11 St.

Lubricant Selection

In lubrication engineering, kinematic viscosity is a key parameter. This converter helps compare lubricants by converting their dynamic viscosity and density to a common scale.

Example: Check if a lubricant meets ISO viscosity grade requirements by converting its properties.

Frequently Asked Questions

What does the Poise–Stokes Converter do?: It calculates kinematic viscosity (in Stokes) from dynamic viscosity (in Pa·s) and density (in kg/m³) using the formula: kinematic viscosity = dynamic viscosity / density. This is useful in fluid mechanics and engineering.
What units are used in this calculator?: Dynamic viscosity is entered in Pascal-seconds (Pa·s), density in kilograms per cubic meter (kg/m³), and the result is given in Stokes (St). The calculator uses these standard SI units for accurate conversion.
Why is density needed for viscosity conversion?: Kinematic viscosity is the ratio of dynamic viscosity to density. It represents the fluid's resistance to flow under gravity. Without density, you cannot convert between these two viscosity measures.

Tips & Common Mistakes

Tips

Ensure dynamic viscosity is in Pa·s. If you have values in poise, convert to Pa·s first (1 P = 0.1 Pa·s).
Density must be in kg/m³. If you have density in g/cm³, multiply by 1000 to get kg/m³.
The result in Stokes is equivalent to cm²/s. To convert to m²/s, divide by 10,000.
For accurate results, use precise values for both inputs, as small errors can affect the final kinematic viscosity.

Common Mistakes to Avoid

Forgetting to convert units: entering dynamic viscosity in poise instead of Pa·s will give incorrect results.
Using density in g/cm³ without converting to kg/m³, leading to a result off by a factor of 1000.
Misinterpreting the result: Stokes is a CGS unit; ensure you understand the scale when comparing with other viscosity values.

Last updated: August 13, 2026

Use Cases

Fluid Mechanics Calculations

Engineers and students can quickly convert dynamic viscosity and density to kinematic viscosity for analyzing fluid flow in pipes, channels, or around objects.

Example: For oil with dynamic viscosity 0.1 Pa·s and density 900 kg/m³, kinematic viscosity = 0.1 / 900 = 0.000111 m²/s = 1.11 St.

Lubricant Selection

In lubrication engineering, kinematic viscosity is a key parameter. This converter helps compare lubricants by converting their dynamic viscosity and density to a common scale.

Example: Check if a lubricant meets ISO viscosity grade requirements by converting its properties.

Frequently Asked Questions

What does the Poise–Stokes Converter do?

It calculates kinematic viscosity (in Stokes) from dynamic viscosity (in Pa·s) and density (in kg/m³) using the formula: kinematic viscosity = dynamic viscosity / density. This is useful in fluid mechanics and engineering.

What units are used in this calculator?

Dynamic viscosity is entered in Pascal-seconds (Pa·s), density in kilograms per cubic meter (kg/m³), and the result is given in Stokes (St). The calculator uses these standard SI units for accurate conversion.

Why is density needed for viscosity conversion?

Kinematic viscosity is the ratio of dynamic viscosity to density. It represents the fluid's resistance to flow under gravity. Without density, you cannot convert between these two viscosity measures.

Tips & Common Mistakes

Tips

Ensure dynamic viscosity is in Pa·s. If you have values in poise, convert to Pa·s first (1 P = 0.1 Pa·s).
Density must be in kg/m³. If you have density in g/cm³, multiply by 1000 to get kg/m³.
The result in Stokes is equivalent to cm²/s. To convert to m²/s, divide by 10,000.
For accurate results, use precise values for both inputs, as small errors can affect the final kinematic viscosity.

Common Mistakes to Avoid

Forgetting to convert units: entering dynamic viscosity in poise instead of Pa·s will give incorrect results.
Using density in g/cm³ without converting to kg/m³, leading to a result off by a factor of 1000.
Misinterpreting the result: Stokes is a CGS unit; ensure you understand the scale when comparing with other viscosity values.

Use Cases

Fluid Mechanics Calculations

Engineers and students can quickly convert dynamic viscosity and density to kinematic viscosity for analyzing fluid flow in pipes, channels, or around objects.

Example: For oil with dynamic viscosity 0.1 Pa·s and density 900 kg/m³, kinematic viscosity = 0.1 / 900 = 0.000111 m²/s = 1.11 St.

Lubricant Selection

In lubrication engineering, kinematic viscosity is a key parameter. This converter helps compare lubricants by converting their dynamic viscosity and density to a common scale.

Example: Check if a lubricant meets ISO viscosity grade requirements by converting its properties.

Frequently Asked Questions

What does the Poise–Stokes Converter do?

What units are used in this calculator?

Why is density needed for viscosity conversion?

Kinematic viscosity is the ratio of dynamic viscosity to density. It represents the fluid's resistance to flow under gravity. Without density, you cannot convert between these two viscosity measures.

Tips & Common Mistakes

Tips

Ensure dynamic viscosity is in Pa·s. If you have values in poise, convert to Pa·s first (1 P = 0.1 Pa·s).
Density must be in kg/m³. If you have density in g/cm³, multiply by 1000 to get kg/m³.
The result in Stokes is equivalent to cm²/s. To convert to m²/s, divide by 10,000.
For accurate results, use precise values for both inputs, as small errors can affect the final kinematic viscosity.

Common Mistakes to Avoid

Forgetting to convert units: entering dynamic viscosity in poise instead of Pa·s will give incorrect results.
Using density in g/cm³ without converting to kg/m³, leading to a result off by a factor of 1000.
Misinterpreting the result: Stokes is a CGS unit; ensure you understand the scale when comparing with other viscosity values.