Viscosity Converter

0 Pascal-Second (Pa·s) =
0
Centipoise (cP)

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About Viscosity Converter

How to Use

  1. Choose Converter Type: Pick between two conversion types:
    • Direct Conversion: Convert from one specific unit to another specific unit
    • All Conversion: Convert one unit to all available units simultaneously
  2. Select Input Unit: Choose the unit you want to convert from (e.g., Pa·s, P, cP, St, cSt) from the dropdown menu.
  3. Enter Value: Type the numeric value you wish to convert in the input field. The converter accepts decimal numbers for precise calculations.
  4. Select Output Unit (Direct Conversion only): If using direct conversion, choose your desired target unit from the second dropdown menu. The conversion happens automatically.
  5. View Results: The converted value appears instantly. In direct conversion mode, you'll see one result. In all conversion mode, you'll see conversions to all available units. You can perform multiple conversions by changing any value or unit selection.
All conversions are calculated in real-time with high precision to ensure accuracy for professional and scientific use. Note: Dynamic viscosity and kinematic viscosity are different properties and cannot be directly converted without knowing the fluid density.

Viscosity Conversion Reference

Dynamic Viscosity - SI Units

  • Pascal-Second (Pa·s): SI unit of dynamic viscosity. 1 Pa·s = 1 kg/(m·s) = 1 N·s/m². Standard unit in engineering and physics.
  • Millipascal-Second (mPa·s): 1 mPa·s = 0.001 Pa·s = 1 cP. Commonly used for low-viscosity fluids like water.
  • Kilogram per Meter-Second (kg/m·s): 1 kg/(m·s) = 1 Pa·s. Alternative SI unit expression.
  • Newton-Second per Square Meter (N·s/m²): 1 N·s/m² = 1 Pa·s. Equivalent SI unit.

Dynamic Viscosity - CGS Units

  • Poise (P): 1 P = 0.1 Pa·s = 100 cP. Named after Jean Léonard Marie Poiseuille. CGS unit commonly used in chemistry.
  • Centipoise (cP): 1 cP = 0.001 Pa·s = 1 mPa·s = 0.01 P. Most common unit for measuring liquid viscosity. Water at 20°C has viscosity of ~1 cP.
  • Micropoise (µP): 1 µP = 0.0001 P = 0.00001 Pa·s. Used for very low viscosity fluids like gases.

Dynamic Viscosity - Imperial/US Units

  • Pound per Foot-Second (lb/ft·s): 1 lb/(ft·s) = 1.48816 Pa·s. Used in US engineering applications.
  • Pound per Foot-Hour (lb/ft·h): 1 lb/(ft·h) = 0.000413378 Pa·s. Used for very viscous fluids in industrial applications.
  • Poundal-Second per Square Foot (pdl·s/ft²): 1 pdl·s/ft² = 1.48816 Pa·s. Alternative imperial unit.
  • Pound-Force Second per Square Inch (lbf·s/in²): 1 lbf·s/in² = 6894.76 Pa·s. High viscosity industrial applications.
  • Pound-Force Second per Square Foot (lbf·s/ft²): 1 lbf·s/ft² = 47.8803 Pa·s. Used in fluid mechanics calculations.

Kinematic Viscosity - CGS Units

  • Stokes (St): 1 St = 1 cm²/s = 0.0001 m²/s = 100 cSt. Named after Sir George Gabriel Stokes. CGS unit for kinematic viscosity.
  • Centistokes (cSt): 1 cSt = 0.01 St = 1 mm²/s. Most common unit for kinematic viscosity. Water at 20°C has ~1 cSt.
  • Square Centimeter per Second (cm²/s): 1 cm²/s = 1 St = 0.0001 m²/s. Equivalent to Stokes.

Kinematic Viscosity - SI Units

  • Square Meter per Second (m²/s): SI unit of kinematic viscosity. 1 m²/s = 10,000 St = 1,000,000 cSt.
  • Square Millimeter per Second (mm²/s): 1 mm²/s = 1 cSt = 0.01 St. Practical SI unit equivalent to centistokes.

Kinematic Viscosity - Imperial/US Units

  • Square Foot per Second (ft²/s): 1 ft²/s = 0.09290304 m²/s = 929.0304 St. Used in US engineering.
  • Square Inch per Second (in²/s): 1 in²/s = 0.00064516 m²/s = 6.4516 St. Used for smaller scale calculations.

Quick Reference Conversions

  • 1 Pa·s = 10 P = 1000 cP = 1000 mPa·s
  • 1 P = 0.1 Pa·s = 100 cP = 1 g/(cm·s)
  • 1 cP = 0.001 Pa·s = 0.01 P = 1 mPa·s
  • 1 St = 1 cm²/s = 0.0001 m²/s = 100 cSt = 100 mm²/s
  • 1 cSt = 0.01 St = 1 mm²/s = 0.000001 m²/s
  • 1 m²/s = 10,000 St = 1,000,000 cSt

Relationship Between Dynamic and Kinematic Viscosity

  • Formula: Kinematic Viscosity (ν) = Dynamic Viscosity (μ) / Density (ρ)
  • SI Units: ν (m²/s) = μ (Pa·s) / ρ (kg/m³)
  • CGS Units: ν (St) = μ (P) / ρ (g/cm³)
  • Example: Water at 20°C: μ = 1.002 cP, ρ = 0.998 g/cm³, therefore ν ≈ 1.004 cSt
  • Note: You cannot directly convert between dynamic and kinematic viscosity without knowing the fluid density.

Common Viscosity Values (at 20°C)

  • Air: ~0.018 cP (dynamic), ~15 cSt (kinematic)
  • Water: ~1.0 cP (dynamic), ~1.0 cSt (kinematic)
  • Milk: ~2-3 cP
  • Blood: ~3-4 cP
  • Olive Oil: ~80-100 cP
  • SAE 10W Motor Oil: ~200-300 cP at 20°C
  • SAE 30 Motor Oil: ~500-600 cP at 20°C
  • Glycerin: ~1,500 cP
  • Honey: ~2,000-10,000 cP
  • Peanut Butter: ~250,000 cP
  • Window Putty: ~1,000,000 cP

Viscosity Grade Classifications

  • Low Viscosity: < 5 cP (gases, water, light oils)
  • Medium Viscosity: 5-100 cP (milk, light oils, blood)
  • High Viscosity: 100-1,000 cP (heavy oils, syrup)
  • Very High Viscosity: 1,000-100,000 cP (honey, glycerin, molasses)
  • Semi-Solid: > 100,000 cP (peanut butter, grease, putty)

Common Use Cases

  • Chemical Engineering: Design pumps, piping systems, mixing equipment, and process operations. Calculate pressure drops and flow rates for chemical processing plants.
  • Petroleum Industry: Characterize crude oil, lubricants, and fuel oils. Determine pumping requirements, flow characteristics, and quality control for petroleum products.
  • Food Industry: Quality control for beverages, sauces, dairy products, and food processing. Ensure consistency and proper texture in food manufacturing.
  • Pharmaceutical Industry: Formulate medicines, creams, ointments, and liquid medications. Control product consistency and ensure proper dosing characteristics.
  • Automotive Industry: Select appropriate motor oils, transmission fluids, and hydraulic fluids based on viscosity grades. Ensure proper lubrication across temperature ranges.
  • Paint & Coatings: Control application properties, flow characteristics, and coverage. Ensure proper spray patterns and film formation.
  • Cosmetics Industry: Formulate lotions, creams, shampoos, and other personal care products with desired texture and application properties.
  • Polymer Processing: Characterize melts and solutions for injection molding, extrusion, and other polymer processing operations.
  • Fluid Mechanics: Calculate Reynolds numbers, predict flow regimes, design hydraulic systems, and analyze fluid behavior in various applications.
  • HVAC Systems: Select appropriate fluids for heating and cooling systems. Calculate flow rates and pressure requirements.
  • Marine Engineering: Select lubricants and fuels for marine engines and systems. Ensure proper performance in marine environments.
  • Adhesives & Sealants: Control application properties and ensure proper bonding characteristics for construction and manufacturing.
  • Research & Development: Characterize new materials, develop formulations, and conduct scientific studies requiring precise viscosity measurements.
  • Quality Control: Monitor product consistency, detect contamination, and ensure specifications are met in manufacturing processes.

Why Use a Viscosity Converter?

  • Accuracy: Eliminates manual calculation errors and provides precise conversions with multiple decimal places for critical engineering and scientific applications.
  • Time-Saving: Instantly converts values without needing to remember complex conversion factors or perform calculations.
  • Multiple Unit Systems: Bridges SI, CGS, and Imperial unit systems, facilitating international collaboration and standard compliance.
  • Professional Applications: Essential tool for chemical engineers, mechanical engineers, chemists, food scientists, and quality control professionals.
  • Standards Compliance: Ensures accurate conversion between different industry standards (ISO, ASTM, SAE) that may use different viscosity units.
  • Research & Development: Critical for scientific publications, technical reports, and patent applications requiring standardized units.
  • Material Specifications: Helps interpret and convert material data sheets, technical specifications, and supplier information from different regions.
  • Process Optimization: Enables engineers to optimize processes by accurately converting viscosity data from literature, experiments, or suppliers.
  • Universal Understanding: Facilitates communication between different industries, countries, and technical disciplines that use different viscosity units.

Understanding Viscosity

What is Viscosity?

Viscosity is a measure of a fluid's resistance to flow or deformation. It describes the internal friction within a fluid - highly viscous fluids (like honey) flow slowly, while low viscosity fluids (like water) flow easily.

Types of Viscosity:

  • Dynamic (Absolute) Viscosity (μ): Measures the force required to move one layer of fluid in relation to another. Units include Pascal-second (Pa·s), Poise (P), and centipoise (cP).
  • Kinematic Viscosity (ν): The ratio of dynamic viscosity to fluid density. Represents the fluid's resistance to flow under gravity. Units include Stokes (St), centistokes (cSt), and m²/s.

Temperature Effects:

Viscosity is highly temperature-dependent. For liquids, viscosity typically decreases with increasing temperature (honey flows more easily when warm). For gases, viscosity increases with temperature. Always specify temperature when reporting viscosity values.

Newtonian vs Non-Newtonian Fluids:

  • Newtonian Fluids: Viscosity remains constant regardless of applied shear rate (e.g., water, simple oils, air).
  • Non-Newtonian Fluids: Viscosity changes with applied shear rate (e.g., ketchup, blood, polymer solutions, paint). May be shear-thinning, shear-thickening, or time-dependent.