Kinematic viscosity is the ratio of a fluid's dynamic viscosity to its density. It measures a fluid's resistance to flow under the influence of gravity. The SI unit is square meters per second (m²/s), but centistokes (cSt) is the most commonly used unit in industry, especially in petroleum and lubrication engineering.
Kinematic Viscosity Converter
Convert between Stokes, Centistokes, m²/s, mm²/s, SUS, SFS, Redwood, Engler degrees and other kinematic viscosity units with scientific precision.
Conversion Formula
1 Stokes = 100 Centistokes
Common Conversions
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How to Use This Converter
Our kinematic viscosity converter is engineered for precision and ease of use. Follow these steps to get accurate conversions instantly.
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Select Source Unit Choose the unit you want to convert from (Stokes, cSt, m²/s, SUS, SFS, etc.)
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Select Target Unit Choose the unit you want to convert to from the second dropdown
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Enter Value Type your kinematic viscosity value — the result appears instantly
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View Formula The exact conversion formula is displayed below for verification
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Swap Units Click the swap button to instantly reverse the conversion direction
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Reference Table Use the common conversions table for quick lookups
Why Professionals Choose ASLI FORM
Built with precision engineering and premium design, our converter meets the demands of petroleum engineers, fluid mechanics professionals, and scientists.
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Scientific Precision Results accurate to 10 significant digits using NIST-standard conversion factors
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Industry Standards Supports SUS, SFS, Redwood, Engler — all major petroleum industry standards
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Instant Results Real-time conversion as you type — no buttons to click, no waiting
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Works Offline All calculations run locally in your browser. Perfect for field work
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Universal Compatibility From basic keypad phones to 4K displays — works on every device
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Zero Tracking No cookies, no analytics, no data collection. Your privacy is absolute
Frequently Asked Questions
Dynamic viscosity (measured in Pa·s or centipoise) measures a fluid's internal resistance to flow. Kinematic viscosity (measured in m²/s or centistokes) is dynamic viscosity divided by fluid density. Kinematic viscosity accounts for the fluid's density, making it useful for comparing flow behavior under gravity. The relationship is: ν = μ/ρ where ν is kinematic viscosity, μ is dynamic viscosity, and ρ is density.
1 Stokes (St) = 100 Centistokes (cSt). To convert Stokes to Centistokes, multiply by 100. To convert Centistokes to Stokes, divide by 100. For example, 5 St = 500 cSt. Note that 1 cSt = 1 mm²/s, so Centistokes and square millimeters per second are equivalent.
SUS is a unit used primarily in the petroleum industry to measure kinematic viscosity. It represents the time in seconds for 60 mL of fluid to flow through a calibrated orifice at a specified temperature (usually 100°F or 210°F). For SUS > 100, the conversion to cSt is approximately: cSt = 0.226 × SUS - 195/SUS. Our converter handles these calculations automatically with high precision.
The conversion depends on the SUS value:
- For SUS > 100: cSt = 0.226 × SUS - 195/SUS
- For SUS ≤ 100: cSt = 0.226 × SUS - 135/SUS
SFS is another petroleum industry unit, similar to SUS but using a larger orifice. It's used for more viscous fluids. The conversion to cSt is approximately: cSt = 2.16 × SFS - 60/SFS (for SFS > 40). SFS values are typically about 10 times smaller than SUS values for the same fluid.
1 m²/s = 1,000,000 cSt (centistokes) = 1,000,000 mm²/s. Since 1 cSt = 1 mm²/s, you can convert m²/s to cSt by multiplying by 1,000,000. For example, 0.000001 m²/s = 1 cSt = 1 mm²/s.
Redwood seconds are a British unit for kinematic viscosity, measuring the time in seconds for 50 mL of fluid to flow through a standardized orifice. There are two types: Redwood No. 1 (for less viscous fluids) and Redwood No. 2 (for more viscous fluids). The conversion to cSt varies based on the Redwood value and requires empirical formulas.
Engler degrees (°E) are a German unit for kinematic viscosity, measuring the time in seconds for 200 mL of fluid to flow through a standardized orifice. The conversion to cSt is approximately: cSt = 0.022 × °E² - 0.18 × °E + 1.5 (for °E > 30). This unit is primarily used in European petroleum industries.
The SI unit for kinematic viscosity is square meters per second (m²/s). However, in practice, square millimeters per second (mm²/s) or centistokes (cSt) are more commonly used because they provide more convenient numbers for typical fluids. Note that 1 mm²/s = 1 cSt exactly.
Our converter delivers results accurate to 10 significant digits using conversion factors from official metrology institutes including NIST, BIPM, and the International Bureau of Weights and Measures. For empirical conversions like SUS to cSt, we use the standard ASTM formulas with high precision.
Yes, the ASLI FORM Kinematic Viscosity Converter is 100% free forever. There are no registration requirements, no usage limits, no subscription fees, and no hidden charges. We do not display advertisements and we do not collect any personal data.
Yes. Once the page loads, all calculations happen locally in your browser. There is no server-side processing, no API calls, and no internet dependency for conversions. This makes the tool perfect for field work, laboratories, and remote locations.
Absolutely. Our converter is designed with a mobile-first responsive approach and works perfectly on every device — from basic keypad phones to 4K desktop displays. The interface adapts intelligently: desktops get a sidebar, tablets get a grid layout, and mobile devices get optimized dropdowns.
Kinematic viscosity is critical in many industries:
- Petroleum & Oil: Lubricant grading, fuel quality testing
- Automotive: Engine oil specifications (SAE grades)
- Chemical: Process fluid characterization
- Food & Beverage: Quality control for oils and syrups
- Pharmaceutical: Drug formulation and quality testing
- Paint & Coatings: Viscosity specifications for application
- Hydraulics: Fluid power system design
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