Calculator
What the Viscosity Converter does
Viscosity Converter: 1 Pa·s = 1000 cP, so multiply a pascal second value by 1000 to get centipoise, or divide to go back. Example: 1 Pa·s = 1000 cP.
Result, How it was calculated and Reverse conversion, derived from Value, From and To. Edit a field and the answer updates in place.
Typical users are anyone working across two measurement systems. Having the exact factor matters more than a rough mental estimate.
There is no back end here. The calculation runs where you are sitting, not on a server somewhere.
If you want to check the arithmetic, the field table, the method and a worked example are further down.
What do the Viscosity Converter fields mean?
The Viscosity Converter uses 3 inputs. You can work from the defaults, or clear them and start fresh, both work.
| Field | What to enter | Default |
|---|---|---|
| Value | required | 1 |
| From | choose from Pascal second (Pa·s), Millipascal second (mPa·s), Poise (P), Centipoise (cP) or Pound-force second per square foot (lbf·s/ft²) | Pascal second (Pa·s) |
| To | choose from Pascal second (Pa·s), Millipascal second (mPa·s), Poise (P), Centipoise (cP) or Pound-force second per square foot (lbf·s/ft²) | Centipoise (cP) |
How does the Viscosity Converter work?
Both units are converted through dynamic viscosity's base unit (Pa·s), so any of the 5 units in the dropdowns can be paired in either direction without loss of accuracy.
Factors follow the internationally agreed definitions. The inch has been exactly 25.4 mm since 1959, and an exact definition is used wherever one exists. Where a unit is fixed by measurement rather than by agreement, the accepted CODATA or IAU value is used.
Worked example
These are the values the Viscosity Converter loads by default, and the result it produces from them. Here is the calculation as it stands the moment the page loads.
| Value | 1 |
|---|---|
| From | Pascal second (Pa·s) |
| To | Centipoise (cP) |
| Result | 1000 cP |
|---|---|
| How it was calculated | 1 Pa·s = 1000 cP, so 1 × 1000 = 1000 cP |
| Reverse conversion | 0.001 Pa·s (if you meant 1 cP) |
Viscosity
Dynamic viscosity measures a fluid’s internal resistance to flow, and water at room temperature provides a genuinely convenient reference point: it measures almost exactly 1 centipoise (cP) at 20°C, which is part of why the centipoise remains popular in practice even though the pascal-second is the formal SI unit.
Worth knowing
- For comparison, honey typically measures somewhere in the range of roughly 2,000 to 10,000 centipoise depending on temperature and variety, while motor oils commonly range from a few dozen to a few hundred centipoise depending on their grade and operating temperature.
- Viscosity drops sharply with rising temperature for most liquids: this is exactly why motor oil "thins out" as an engine warms up, and why viscosity ratings (like the "W" winter grade in multi-grade motor oils) specify performance across a temperature range rather than a single fixed value.
- The poise and centipoise are CGS units, much like the dyne, that have persisted in fluid-dynamics and chemical-engineering practice even as the field has broadly moved toward SI units elsewhere.
Definitions: BIPM SI Brochure · NIST reference on units
How to use it
- Fill in Value.
- Pick a value for From: the options are Pascal second (Pa·s), Millipascal second (mPa·s), Poise (P), Centipoise (cP) or Pound-force second per square foot (lbf·s/ft²).
- Pick a value for To: the options are Pascal second (Pa·s), Millipascal second (mPa·s), Poise (P), Centipoise (cP) or Pound-force second per square foot (lbf·s/ft²).
- Live output means you can search for a target value by nudging an input up and down.
- The panel reports Result, How it was calculated and Reverse conversion.
- Copy Link is the quickest way to send the exact scenario to someone else.
What this tool does not do
- Repeated conversions compound rounding, so convert once from the original value where possible.
- Factors use the internationally agreed definitions; some industries round them differently.
- It cannot detect a typo that happens to fall inside the valid range.
- The tool cannot tell whether a number was entered in the unit you intended, so double-check the labels.
Frequently asked questions
You need Value, From and To. Nothing starts empty, letting you treat it as a what-if tool rather than a data-entry form.
With the values loaded when the page opens, result comes out as 1000 cP. Any edit re-runs the calculation, so there is no stale number on screen.
No. Disconnect from the internet and it still works; that is the simplest proof there is no server call.
Nothing at all. There is no registration, no paywall and no per-use quota.
The conversion is exact for the method described above. Where a value is rounded for display, the underlying figure keeps full precision.