How to Convert Pascals to Inches of mercury (Pa to inHg)
Pressure conversions are used for tyre pressure (psi or bar), blood pressure readings in mmHg and weather maps in millibars. This guide shows how to convert pascals into inches of mercury by hand, with examples and a quick-reference table.
The conversion
To convert pascals to inches of mercury, multiply the value by 0.0002952998. To go the other way, divide by the same number (or multiply by 3,386.389). Because the factor is tiny, scientific notation keeps the numbers manageable.
Inches of mercury = pascals × 0.0002952998
Worked examples
- 3 Pa = 0.000886 inHg
- 12.5 Pa = 0.003691 inHg
- 75 Pa = 0.022147 inHg
Pascals to Inches of mercury table
| Pascals | Inches of mercury |
|---|---|
| 1 Pa | 0.000295 inHg |
| 2 Pa | 0.000591 inHg |
| 5 Pa | 0.001476 inHg |
| 10 Pa | 0.002953 inHg |
| 20 Pa | 0.005906 inHg |
| 25 Pa | 0.007382 inHg |
| 50 Pa | 0.014765 inHg |
| 100 Pa | 0.02953 inHg |
| 250 Pa | 0.073825 inHg |
| 500 Pa | 0.14765 inHg |
| 1,000 Pa | 0.2953 inHg |
Common questions
Is Pa to inHg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Inches of mercury to Pascals converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Pascals to Inches of mercury Converter or browse all pressure converters.
Run your own numbers: Pascals to Inches of mercury Converter