Viscosity Converter

1Millipascal Second = 1Centipoise

Dynamic Viscosity

Pascal Second (Pa·s)0.001

Millipascal Second (mPa·s)1

Centipoise (cP)1

Free online viscosity converter for dynamic viscosity units. It currently supports pascal-second (Pa·s), millipascal-second (mPa·s), and centipoise (cP). This page is useful for lubricant, hydraulic oil, coating, ink, adhesive, resin, chemical-fluid, and lab records where the goal is to standardize dynamic viscosity units quickly. It does not convert kinematic viscosity units such as cSt or mm²/s. Within the units supported here, 1 cP = 1 mPa·s. All calculations stay in your browser.

Unit Converter

Centralized entry to 35 unit categories, suitable for switching back and forth between viscosity, density, temperature and flow pages

Density Converter

If you then want to relate dynamic viscosity to kinematic viscosity, density is usually the unavoidable intermediate quantity.

Temperature Converter

Viscosity is highly dependent on the test temperature. When comparing data across regions, it is often necessary to unify the temperature unit at the same time.

Flow Rate Converter

Volume Converter

What problem does dynamic viscosity conversion solve?

Viscosity is a way of quantifying a fluid's resistance to flow. For engineers and process professionals, the most common one encountered is dynamic viscosity, which is the ability of a fluid to resist flow under shear. Its SI unit expression is Pa·s, and mPa·s and cP are often seen in oil products, chemicals, coatings and experimental materials.

The 3 units supported on this page are essentially a set of linear scaling relationships: 1 Pa·s = 1000 mPa·s = 1000 cP, and 1 cP = 1 mPa·s. In other words, in many materials, cP and mPa·s are just written differently in the industry and do not represent different physical quantities.

The common mistake is that many people confuse dynamic viscosity and kinematic viscosity. Kinematic viscosity is commonly written as cSt or mm²/s, which is equal to dynamic viscosity divided by density. As long as density information is missing, cSt cannot be accurately converted to cP or Pa·s, so this page does not shoehorn these two types of units into one page.

Viscosity is also highly dependent on temperature. For example, the same oil sample may have very different values at 20 °C, 40 °C and 100 °C. Therefore, when actually reading the specification, unit conversion is only the first step; test temperature, sample status and measurement method are equally critical.

If your goal is just to unify Pa·s, mPa·s, and cP in a parameter table to the same unit style, this page is enough; if you want to further judge the pumpability, sprayability, coating properties, or the relationship with cSt, you need to continue to analyze density, temperature, and process conditions together.

Use Cases

Unify cP in lubricating oil or hydraulic oil data into mPa·s to facilitate internal comparison within the team
Quickly switch between Pa·s and cP when reading TDS for coatings, inks, adhesives and resins
Organize laboratory rheology test records and unify viscosity units used by different colleagues into the same column
Check the dynamic viscosity field in supplier sample sheets, quality inspection reports and purchase lists
Unify the viscosity unit unit style in chemical process cards, formula records and trial production reports
Explain to a client or colleague why 500 cP and 500 mPa·s are actually the same number
When comparing different brands of glue, resin, slurry or oil, quickly determine whether the magnitudes are close.
Check the viscosity of pumped liquids, coating liquids or filling liquids during the equipment selection meeting
Replace Pa·s in the English information with cP, which is more familiar to the team, or reversely replace it with SI unit style.
Demonstrate the core relationship of 1 cP = 1 mPa·s and 1000 cP = 1 Pa·s when doing training courseware
Organize the old version of the formula sheet and the new version of the spreadsheet to keep the viscosity field in a consistent format
By expanding the results panel, you can view all the results of the same value in Pa·s, mPa·s, and cP at once.
Standardize cP and mPa·s on lubricant, hydraulic-oil, or adhesive listings from Amazon or Home Depot
Check Pa·s and cP fields on resin, coating, or ink spec sheets from Grainger
Clean up TDS screenshots from eBay sellers and normalize everything into one dynamic-viscosity unit style
Compare sample data from Amazon, Home Depot, and Grainger without misreading Pa·s, mPa·s, and cP as different physical quantities

How to Use

Fill in the viscosity value in the input box, such as 1, 25, 500 or 0.35
Select the source unit in the drop-down box on the left: Pa·s, mPa·s or cP
Select the target unit in the drop-down box on the right, and the results will be refreshed immediately.
If you want to view the reverse conversion, click the middle swap button to quickly switch
If the unit of data you have is cSt, mm²/s or St, please stop and confirm that it is kinematic viscosity instead of continuing to use this page.

Features

Strictly fit the current code capabilities: only support 3 dynamic viscosity units Pa·s, mPa·s, cP, no more fictitious kinematic viscosity or other units that do not exist on the page
Two-way instant conversion between any two units, suitable for quickly unifying the writing methods in specifications, TDS, SDS and experimental records
Supports one-click exchange of source and target units, making it easier to check Pa·s, mPa·s and cP back and forth.
Expand the results panel to view the results of the same value in all viscosity units at the same time, suitable for supplier price comparison tables and training materials.
Clearly explain 1 cP = 1 mPa·s, 1000 cP = 1 Pa·s, helping to quickly grasp the most commonly used unit style relationships
The text will distinguish dynamic viscosity, kinematic viscosity, density and temperature effects to reduce the common mistake of mixing cP and cSt
Pure browser local computing: no requests are sent, no server logs are left, and can be used directly in laboratories, workshops, customer sites and disconnected environments.

How to distinguish dynamic viscosity, kinematic viscosity, density and temperature?

What really confuses people is usually not the formulas, but the mixing of different physical quantities into one column.

concept	what does it describe	Common writing methods	Use reminder
`dynamic viscosity`	The ability of a fluid to resist shear flow	Pa·s/mPa·s/cP	This is the conversion object directly supported by this page
`kinematic viscosity`	Dynamic viscosity divided by density	cSt / mm²/s / St	Cannot break away from density and fixed conversion of this page
`Density`	mass per unit volume	kg/m³ / g/cm³	If you want to push from dynamic viscosity to kinematic viscosity, you must first have density
`Test temperature`	Measurement conditions corresponding to viscosity data	20 °C / 25 °C / 40 °C / 100 °C	Under the same unit, the numerical meaning may be completely different if the temperature is different.

Best Practices

First confirm whether the data is written as dynamic viscosity or kinematic viscosity.

If the unit is Pa·s, mPa·s, cP, it is usually dynamic viscosity; if the unit is cSt or mm²/s, it is usually kinematic viscosity. Don't convert directly without looking at the dimensions.

Record the units along with the test temperature

The same 100 cP may have completely different process implications if one is measured at 25 °C and one is measured at 60 °C. Uniformity of units does not mean uniformity of conditions.

It is best to choose a unified display unit style within the team

Many laboratories like to write mPa·s, many suppliers like to write cP, and some technical documents prefer Pa·s. After selecting a unified output unit style and retaining the original units, it will be more convenient to manage forms and reports in the long term.

When you see a large value, first determine whether it is Pa·s or cP

5000 cP and 5000 Pa·s are not the same magnitude at all. Especially for viscose, resin, coating liquid and paste liquid, it is most easy for the unit to misjudge the fluidity because the unit does not see clearly.

When making judgments about pumping, spraying or filling, don’t just look at the unit conversion results

Actual processes are also affected by temperature, shear rate, equipment construction, pipe diameter, and non-Newtonian behavior of the fluid. This page is intended for uniform unit style but is not a substitute for process evaluation.

FAQ

What viscosity units does this page support?

The current page only supports 3 dynamic viscosity units: Pa·s, mPa·s and cP. It is suitable for processing the most common dynamic viscosity writing methods, but it does not include kinematic viscosity units such as cSt, mm²/s, St, etc., nor does it provide linkage conversion involving density.

Is 1 cP the same as 1 mPa·s?

Same. In dynamic viscosity conversion, 1 cP = 1 mPa·s, which is the most common and easiest to remember conversion relationship. Many oil products, coatings and chemical materials only have different writing methods between cP and mPa·s, but the values themselves are the same.

1 Pa·s is equal to how many cP?

1 Pa·s = 1000 mPa·s = 1000 cP. Conversely, 100 cP = 0.1 Pa·s, 500 cP = 0.5 Pa·s. These anchor points are very commonly used when making experimental records or comparing coating process parameters.

What is the difference between dynamic viscosity and kinematic viscosity?

Dynamic viscosity describes the ability of a fluid to resist shear flow, and common units are Pa·s, mPa·s, and cP; kinematic viscosity is the dynamic viscosity divided by density, and common units are cSt and mm²/s. In other words, kinematic viscosity cannot be separated from density and dynamic viscosity is fixed and interchangeable, so this page does not mix the two together.

What if the data says cSt or mm²/s?

That is usually a kinematic viscosity, which is not appropriate for continuing on this page. You need to confirm the fluid density first, or find a special kinematic viscosity conversion tool instead. Accurate cP or Pa·s cannot be obtained directly from the cSt number alone.

Why does the same liquid have very different viscosity at different temperatures?

Because viscosity is inherently strongly dependent on temperature. Especially for oils, resins, adhesives and coatings, the values can vary significantly every few degrees of temperature change. Therefore, when reading the information, be sure to read "unit" and "test temperature" together instead of just converting the unit.

What is the approximate viscosity of pure water near room temperature?

A common reference value is that the dynamic viscosity of pure water at 20 °C is about 1 mPa·s, which is about 1 cP. This anchor point is often used to help understand the magnitude of cP and mPa·s, but the actual application should still be based on your test temperature and sample conditions.

What materials is this tool suitable for reading?

It is suitable for reading technical data of lubricants, hydraulic oils, coatings, inks, adhesives, resins, and chemical liquids. It is also suitable for processing dynamic viscosity fields in laboratory records, purchase forms, quality inspection orders, and supplier comparison tables.

Will the entered data be uploaded?

No. All viscosity conversions are completed locally in the browser, and the values will not be sent to the server or written to the server log. Whether you are in the laboratory, customer factory, production workshop or supplier communication site, you can use it directly locally.

Can it still be used when the internet is disconnected?

Yes. After the page is loaded, the conversion logic runs in the browser, and offline or weak network environments will not affect normal viewing results.

Is this enough for reading cP or mPa·s on Amazon, Home Depot, or Grainger product pages?

Yes, as long as the page lists dynamic viscosity in Pa·s, mPa·s, or cP. If a seller uses cSt, mm²/s, or only says “viscosity” without a unit, stop and confirm whether it is actually kinematic viscosity or just incomplete labeling.

Glossary

dynamic viscosity: A physical quantity that describes a fluid's ability to resist shear flow. This page deals with this type of viscosity. Common units include Pa·s, mPa·s, and cP.
Pa·s: Pasec, SI unit of dynamic viscosity. This writing method is more commonly used for higher viscosity fluids, academic materials, and some engineering documents.
mPa·s: Millipasecond, 1 mPa·s = 0.001 Pa·s. Many daily liquids, laboratory data and industrial product parameter tables are more accustomed to using mPa·s.
cP: Centipoise, a common industry notation for dynamic viscosity. Numerically, 1 cP = 1 mPa·s, so it is very common in oils, coatings, adhesives and chemical materials.
kinematic viscosity: The quantity obtained by dividing dynamic viscosity by density. Common units are cSt, mm²/s. It is not a conversion object directly supported by this page.
Test temperature: The viscosity data corresponds to the measurement temperature conditions. Temperature has a great influence on viscosity, so you must read the parameters together with the unit.

Commonly used dynamic viscosity conversion anchor points

These ratios are best used for checking specifications, experimental records, and process charts.

starting point	Common conversion results	Common scenarios
`1 cP`	`1 mPa·s / 0.001 Pa·s`	Experiment records, oil and paint information
`10 cP`	`10 mPa·s / 0.01 Pa·s`	Low viscosity liquids, cleaning fluids, and some coating fluids
`100cP`	`100 mPa·s/0.1 Pa·s`	Common Anchor Points for Medium Viscosity Process Liquids
`500cP`	`500 mPa·s/0.5 Pa·s`	Preliminary comparison of resin, adhesive and slurry parameters
`1Pa·s`	`1000 mPa·s/1000 cP`	High viscosity samples, engineering documentation and academic writing

Which way of writing viscosity is most commonly used for different data?

First recognize the customary unit style in the document, and then decide whether to convert it.

Data type	Common units	Reading reminder
Laboratory original records	`mPa·s/cP`	Many testers and manual forms prefer these two writing methods, and the values are usually the same.
Chemical Industry/Coatings/Adhesives TDS	`cP`	It is very common in the industry, but it is still necessary to look at the test temperature and shear conditions at the same time.
Engineering or academic documents	`Pa·s`	Closer to the SI system, the value will appear to be 1000 times smaller than cP
Oil information	`cP or cSt`	If cSt appears, you must first determine that it has been converted to kinematic viscosity.
Purchasing/Comparison table	`Unify the output into one column`	It is recommended that the team fix a display unit style while retaining the original unit field

Privacy & Security

All viscosity conversions on this page run entirely in your browser. Values are not sent to the server, written to server logs, or stored by the tool. It is a safe fit for lab records, formulation notes, supplier sample sheets, and internal process documents.