Viscosity Converter
Convert between different viscosity units including pascal-seconds, poise, centipoise, stokes, and centistokes
Conversion Settings
Dynamic viscosity - resistance to flow
Dynamic viscosity - resistance to flow
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Conversion Result
Conversion result will appear here
Enter a value and click "Convert" to start
Viscosity Types:
- • Dynamic Viscosity: Resistance to flow (Pa·s, P, cP)
- • Kinematic Viscosity: Dynamic viscosity ÷ density (St, cSt, m²/s)
Common Fluid Viscosities (at 20°C):
- • Air: ~0.018 cP
- • Water: ~1.0 cP
- • Motor oil: ~100-300 cP
- • Honey: ~10,000 cP
- • Glycerol: ~1,400 cP
About Viscosity Converter
A comprehensive viscosity converter tool that allows you to convert between various viscosity measurement units. Whether you're working in fluid mechanics, chemical engineering, petroleum industry, or materials science, this tool provides accurate conversions between dynamic viscosity units (pascal-seconds, poise, centipoise) and kinematic viscosity units (stokes, centistokes).
Why use a Viscosity Converter?
Viscosity conversion is essential in fluid mechanics, chemical engineering, and materials science. Different industries and regions use different viscosity units - SI units like pascal-seconds, CGS units like poise and stokes, and practical units like centipoise. This tool eliminates conversion errors and saves time when working with fluid properties, pump calculations, and material specifications.
Who is it for?
This tool is perfect for chemical engineers, mechanical engineers, fluid mechanics specialists, petroleum engineers, materials scientists, laboratory technicians, students studying fluid mechanics, and professionals working with viscous fluids who need accurate viscosity unit conversions.
How to use the tool
Enter the viscosity value you want to convert in the input field
Select the source unit from the dropdown (pascal-seconds, poise, etc.)
Choose the target unit you want to convert to
Click 'Convert' to see the result instantly
Use the swap button to quickly reverse the conversion direction
Copy the result or use the clear button to start over
Frequently Asked Questions
How do I convert viscosity units?
Enter the source value, pick the 'from' and 'to' units, and the result appears instantly. Supports Pa·s (pascal-second, SI dynamic), cP (centipoise, ≡ mPa·s), P (poise, CGS), m²/s (kinematic), cSt (centistokes). Copy the converted value to clipboard. Conversion runs entirely in your browser — values never leave the device. Decimal precision is configurable; default shows 4-6 significant figures, appropriate for most use cases. For scientific work needing more precision, increase the decimal places in the settings.
What viscosity units does this converter support?
Pa·s (pascal-second, SI dynamic), cP (centipoise, ≡ mPa·s), P (poise, CGS), m²/s (kinematic), cSt (centistokes). The set covers SI base and derived units, common imperial/US-customary units, and domain-specific units where relevant. SI prefixes (k, M, G, m, μ, n) apply where applicable. For any unit not in the list that you need converted, mention it via feedback — the unit set evolves based on user requests.
How accurate is the viscosity conversion?
Conversions use exact internationally-defined factors where they exist — no rounding loss at the math level. Conversion factors: 1 Pa·s = 1,000 cP; 1 cSt = 1 mm²/s. Viscosity is temperature-dependent — always specify temperature (typically 20°C, 25°C, or 40°C for oils). Output precision is bounded by the displayed decimal places (configurable, typically 4-6 by default). For extreme precision needs (scientific publications), increase the displayed decimals to match your significant-figure requirements.
What's the formula to convert centipoise (cP) to millipascal-seconds (mPa·s)?
mPa·s = cP (identical). Lubricants (oil grades — SAE 30, 5W-40 use kinematic viscosity at specific temperatures), food processing (honey, syrups — high viscosity), pharmaceuticals (drug formulation), industrial fluids. For other viscosity-unit pairs, the tool applies the appropriate exact conversion factor automatically — no manual formula needed. The conversion preserves precision to the displayed decimal places; choose precision to match your downstream use (engineering specs typically need 3-4 significant figures; scientific work may need more).
What's the key accuracy caveat for viscosity conversion?
**Dynamic viscosity (Pa·s) vs kinematic viscosity (m²/s) — different concepts**. Dynamic (or absolute) viscosity is resistance to shear; kinematic is dynamic divided by density. They're not interchangeable: 1 cP and 1 cSt are different things. Water at 20°C has dynamic viscosity 1.0016 cP ≈ 1 mPa·s, and kinematic viscosity ~1.004 cSt — both close to 1 because water's density is ~1 kg/L. For other fluids, they differ.
What's a common real-world use case for viscosity conversion?
Lubricants (oil grades — SAE 30, 5W-40 use kinematic viscosity at specific temperatures), food processing (honey, syrups — high viscosity), pharmaceuticals (drug formulation), industrial fluids.
What viscosity units are commonly confused?
**Dynamic (Pa·s, cP) vs kinematic (m²/s, cSt)** — divide dynamic by density to get kinematic. **1 cP = 1 mPa·s** (exact equivalence). **'Centipoise' is the everyday name** for mPa·s in industrial contexts.
How do I handle very large or very small viscosity values?
Use SI prefixes for clean scaling: kilo (10³), mega (10⁶), giga (10⁹), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹). For values beyond standard prefixes, the tool displays results in scientific notation (e.g. 1.23e+15) for readability. Conversion factors: 1 Pa·s = 1,000 cP; 1 cSt = 1 mm²/s. Viscosity is temperature-dependent — always specify temperature (typically 20°C, 25°C, or 40°C for oils). For data interchange to other tools, copy the raw value; for human readers, use the precision that matches the context.
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