Kinematic Viscosity (cSt / mm²/s) ↔ Dynamic Viscosity (cP / mPa·s) & Saybolt (SUS) Converter

Convert Kinematic Viscosity (cSt) to Dynamic Viscosity (cP = cSt × SG), Pascal-seconds, and Saybolt SUS.

Dynamic (Absolute) Viscosity
40.02 cP (mPa·s)
Saybolt Universal Viscosity (SUS @ 100°F) 215.452 SUS
SI Dynamic Viscosity (Pascal-seconds) 0.04 Pa·s
Fluid Density (kg/m³) 870 kg/m³
Inputs
⚡ Scenarios:
cSt
Kinematic viscosity ν in centistokes (cSt = mm²/s; e.g., ISO VG 46 hydraulic oil = 46 cSt at 40°C).
g/cm³
Fluid specific gravity / density in g/cm³ (Water = 1.00, Mineral oil ≈ 0.86–0.89).
Results & Graph
Dynamic (Absolute) Viscosity
40.02 cP (mPa·s)
Saybolt Universal Viscosity (SUS @ 100°F)
215.452 SUS
SI Dynamic Viscosity (Pascal-seconds)
0.04 Pa·s
Fluid Density (kg/m³)
870 kg/m³

Dynamic (Absolute) Viscosity

Graph 1 • cSt ↔ cP & Saybolt Viscosity • Domain Architecture & Live Telemetry Maps Kinematic Viscosity Cst, Fluid Specific Gravity Sg through cSt ↔ cP & Saybolt Viscosity Formula.
Kinematic Viscosity (cSt / mm²/s) ↔ Dynamic Viscosity (cP / mPa·s) & Saybolt (SUS) Converter • Custom Domain Schematic (Fluid & Chemical Conversions) Exact SI / Imperial Factor Bridge (cSt ↔ cP & Saybolt Vis) Kinematic Viscosity Cst: 46 cSt • Fluid Specific Gravity Sg: 0.870 g/cm³ DYNAMIC (ABSOLUTE) VISCOSI 40.02 cP (mPa·s) • Saybolt Universal Visc: 215.452 SUS • SI Dynamic Viscosity (: 0.04 Pa·s Eq: Dynamic_cP = Kinematic_cSt × Flu
Graph 2 • Dynamic (Absolute) Viscosity Across Kinematic Viscosity Cst Sweep (40% → 160%) Evaluates Dynamic_cP = Kinematic_cSt × FluidSpecificGravity; SUS_100F ≈ 4.632 × across 7 operating points (current input highlighted).
0 cP (mP 35.22 cP (mP 70.44 cP (mP 16.01 18.40cSt 24.01 27.60cSt 32.02 36.80cSt 40.02 46cSt 48.02 55.20cSt 56.03 64.40cSt 64.03 73.60cSt
Graph 3 • Joint Sensitivity: Kinematic Viscosity Cst × Fluid Specific Gravity Sg Compares Dynamic (Absolute) Viscosity when Fluid Specific Gravity Sg is shifted +25% (solid) vs. −25% (dashed).
0 cP (mP 35.75 cP (mP 71.50 cP (mP --- Fluid Specific Gravity Sg @ 75% 35.00 -30% 42.50 -15% 50.00 +0% 57.50 +15% 65.00 +30%
Summary: At SG = 0.87 g/cm³, 46 cSt (mm²/s) kinematic viscosity equals 40.02 cP (mPa·s) dynamic viscosity and ~215.5 Saybolt Universal Seconds (SUS at 100°F).
Summary: At SG = 0.87 g/cm³, 46 cSt (mm²/s) kinematic viscosity equals 40.02 cP (mPa·s) dynamic viscosity and ~215.5 Saybolt Universal Seconds (SUS at 100°F).
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Formula & Mathematical Methodology: cSt ↔ cP & Saybolt Viscosity Formula

DynamiccP = KinematiccSt × FluidSpecificGravity
SUS100F ≈ 4.632 × KinematiccSt (for cSt > 50)
Dynamic_cP = Kinematic_cSt × FluidSpecificGravity; SUS_100F ≈ 4.632 × Kinematic_cSt (for cSt > 50)
  • kinematicViscosityCst: Kinematic viscosity ν in centistokes (cSt = mm²/s; e.g., ISO VG 46 hydraulic oil = 46 cSt at 40°C).
  • fluidSpecificGravitySg: Fluid specific gravity / density in g/cm³ (Water = 1.00, Mineral oil ≈ 0.86–0.89).

Rounding: Internal floating-point calculations run in 64-bit IEEE-754 double precision; display values round to 2–4 decimal places.

Worked Example: cSt ↔ cP & Saybolt Viscosity Worked Example

Convert Kinematic Viscosity (cSt) to Dynamic Viscosity (cP = cSt × SG), Pascal-seconds, and Saybolt SUS.

  1. Enter the input measurement, system configuration, or astronomical parameter.
  2. Apply the standard conversion or analytical equation: Dynamic_cP = Kinematic_cSt × FluidSpecificGravity; SUS_100F ≈ 4.632 × Kinematic_cSt (for cSt > 50).
  3. Inspect the primary metric, secondary equivalents, and 3 real-time SVG graphs.
Result: Computes cSt ↔ cP & Saybolt Viscosity via Dynamic_cP = Kinematic_cSt × FluidSpecificGravity; SUS_100F ≈ 4.632 × Kinematic_cSt (for cSt > 50).

Frequently Asked Questions

How does the Kinematic Viscosity (cSt / mm²/s) ↔ Dynamic Viscosity (cP / mPa·s) & Saybolt (SUS) Converter perform the calculation?

It evaluates Dynamic_cP = Kinematic_cSt × FluidSpecificGravity; SUS_100F ≈ 4.632 × Kinematic_cSt (for cSt > 50) directly in your browser and renders three custom SVG charts in real time.

Can I solve backwards for an input parameter using Goal Seek?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any numeric input field.

Does this tool work offline?

Yes. All calculations run 100% locally in your browser with full offline PWA support.

Unit Conversions · Fluid & Chemical Conversions

Kinematic Viscosity (cSt / mm²/s) ↔ Dynamic Viscosity (cP / mPa·s) & Saybolt (SUS) Converter: inputs, method, and how to read the result

Convert Kinematic Viscosity (cSt) to Dynamic Viscosity (cP = cSt × SG), Pascal-seconds, and Saybolt SUS.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Kinematic Viscosity Cst: Kinematic viscosity ν in centistokes (cSt = mm²/s; e.g., ISO VG 46 hydraulic oil = 46 cSt at 40°C).
  • Fluid Specific Gravity Sg: Fluid specific gravity / density in g/cm³ (Water = 1.00, Mineral oil ≈ 0.86–0.89).

What the calculation includes

With the default values shown, Dynamic (Absolute) Viscosity is 40.02 cP (mPa·s). The calculation follows cSt ↔ cP & Saybolt Viscosity Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Kinematic Viscosity Cst from 46 cSt to 51 cSt changes Dynamic (Absolute) Viscosity from 40.02 cP (mPa·s) to 44.37 cP (mPa·s). This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses official NIST Special Publication 811, IEEE/RFC systems engineering, APA psychometric, and USNO astronomical formulas.
  • Empirical metallurgy and calendar conversions represent standard reference-condition approximations.

Scope: Global NIST, IEEE, APA & Astronomical Standard Check the assumptions and limitations against your situation before relying on the estimate.

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