How to Convert Kilopascals to Millimetres of mercury (kPa to mmHg)
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 kilopascals into millimetres of mercury by hand, with examples and a quick-reference table.
The conversion
To convert kilopascals to millimetres of mercury, multiply the value by 7.5006375542. To go the other way, divide by the same number (or multiply by 0.133322). For a quick estimate, multiply by about 7.5.
Millimetres of mercury = kilopascals × 7.5006375542
Worked examples
- 3 kPa = 22.5019 mmHg
- 12.5 kPa = 93.758 mmHg
- 75 kPa = 562.5478 mmHg
Kilopascals to Millimetres of mercury table
| Kilopascals | Millimetres of mercury |
|---|---|
| 1 kPa | 7.5006 mmHg |
| 2 kPa | 15.0013 mmHg |
| 5 kPa | 37.5032 mmHg |
| 10 kPa | 75.0064 mmHg |
| 20 kPa | 150.0128 mmHg |
| 25 kPa | 187.5159 mmHg |
| 50 kPa | 375.0319 mmHg |
| 100 kPa | 750.0638 mmHg |
| 250 kPa | 1,875.16 mmHg |
| 500 kPa | 3,750.32 mmHg |
| 1,000 kPa | 7,500.64 mmHg |
Common questions
Is kPa to mmHg 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 Millimetres of mercury to Kilopascals converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
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
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
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.
For any value, use the Kilopascals to Millimetres of mercury Converter or browse all pressure converters.
Run your own numbers: Kilopascals to Millimetres of mercury Converter