Viscosity Converter

Kinematic Viscosity Converter

Convert kinematic viscosity among SI, CGS, and common engineering units, including the exact equivalence between centistokes and square millimeters per second.

Convert kinematic viscosity units

Kinematic viscosity conversion method

Converted value = input × source factor in m²/s ÷ target factor in m²/s. Key identity: 1 cSt = 1 mm²/s = 10⁻⁶ m²/s.

Exact cSt relation

Shows that 1 cSt equals 1 mm²/s.

Broad unit coverage

Includes SI, CGS, and imperial area-per-time units.

Density guidance

Explains the distinction from dynamic viscosity.

How to convert kinematic viscosity units

Kinematic viscosity describes momentum diffusion in a fluid and equals dynamic viscosity divided by density. Its SI unit is square meters per second (m²/s), but centistokes (cSt) and square millimeters per second (mm²/s) are widely used because typical liquid values are easier to read in those units.

The conversion uses m²/s as the internal reference. One centistoke is exactly one mm²/s, while one stoke equals 100 cSt. Imperial square-foot and square-inch units are also included for legacy specifications and engineering references.

Do not treat a kinematic value as a dynamic value merely because both are described as viscosity. Converting between them requires fluid density at the applicable temperature and pressure. As with dynamic viscosity, the physical value can vary with temperature and fluid composition.

Kinematic viscosity unit reference

InputWhat it meansPlanning note
m²/sSI kinematic viscosity unitTypical liquid values can be very small.
mm²/sOne millionth of m²/sExactly equal numerically to cSt.
Centistoke (cSt)One hundredth of a stokeCommon for oils and petroleum products.
Stoke (St)CGS kinematic viscosity unit1 St equals 100 cSt.

Common use cases

Lubricant data

Convert oil viscosity grades and laboratory values.

Hydraulic systems

Compare fluid specifications in different unit systems.

Transport calculations

Prepare viscosity inputs for flow and Reynolds-number work.

Frequently asked questions

What is kinematic viscosity?

It is dynamic viscosity divided by density and has dimensions of area per time.

Is cSt the same as mm²/s?

Yes. One centistoke equals exactly one square millimeter per second.

How many cSt are in one stoke?

One stoke equals 100 centistokes.

How do I convert cP to cSt?

You need density. With compatible common units, cSt is approximately cP divided by density in g/cm³.

Related viscosity converters

Last reviewed: August 20, 2026. Verify fluid temperature, pressure, density, and measurement method when engineering accuracy matters.

More Viscosity - Dynamic Converter Tools

Viscosity - Dynamic Converter

Tools

Converter

Calculator

Finance & Business Calculators

Free finance and business calculators for interest, loans, profit margins, tax, fees, ROI, and everyday business planning.

Construction Calculators

Free construction calculators for concrete, paint, tile, flooring, roofing, drywall, gravel, and other building material estimates.

All Construction Calculators tools

Asphalt Calculator Attic Insulation Calculator Backsplash Tile Calculator Baseboard Trim Calculator Board Foot Calculator Carpet Calculator Caulk Calculator Compost Calculator Concrete Block Calculator Concrete Calculator Concrete Column Calculator Concrete Footing Calculator Concrete Slab Calculator Countertop Calculator Crown Molding Calculator Deck Board Calculator Deck Footing Calculator Deck Railing Calculator Deck Stain Calculator Door Casing Calculator Drip Irrigation Calculator Driveway Sealer Calculator Drywall Calculator Drywall Joint Compound Calculator Epoxy Floor Coating Calculator Fence Calculator Fence Paint Calculator Floor Joist Count Calculator Flooring Calculator French Drain Calculator Garden Hose Flow Rate Calculator Grass Seed Calculator Gravel Calculator Greenhouse Glazing Calculator Greenhouse Heating Calculator Greenhouse Irrigation Water Calculator Greenhouse Shade Cloth Calculator Greenhouse Size Calculator Greenhouse Ventilation Calculator Gutter Calculator Insulation Calculator Laminate Flooring Calculator Landscape Edging Calculator Lawn Fertilizer Calculator Lawn Watering Calculator Mulch Calculator Paint Calculator Paver Calculator Pergola Rafter Calculator Plant Spacing Calculator Plywood Calculator Pond Volume Calculator Rafter Length Calculator Rainwater Harvesting Calculator Raised Bed Soil Calculator Ramp Length Calculator Rebar Calculator Retaining Wall Block Calculator Roof Pitch Calculator Roofing Calculator Room Paint Calculator Shed Material Calculator Siding Calculator Sod Calculator Sprinkler Coverage Calculator Stair Calculator Tile Calculator Tile Layout Calculator Topsoil Calculator Wall Stud Calculator Wallpaper Calculator Water Feature Pump Calculator Window Replacement Calculator

Need a Custom Tool or Calculator?

Don't see the tool you need? Let us know via email, and we'll consider adding it.

869241891@qq.com