How to Convert Bar to PSI (bar to psi)
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 bar into psi by hand, with examples and a quick-reference table.
The conversion
To convert bar to psi, multiply the value by 14.5037743897. To go the other way, divide by the same number (or multiply by 0.06894757). For a quick estimate, multiply by about 15.
PSI = bar × 14.5037743897
Worked examples
- 3 bar = 43.5113 psi
- 12.5 bar = 181.2972 psi
- 75 bar = 1,087.78 psi
Bar to PSI table
| Bar | PSI |
|---|---|
| 1 bar | 14.5038 psi |
| 2 bar | 29.0075 psi |
| 5 bar | 72.5189 psi |
| 10 bar | 145.0377 psi |
| 20 bar | 290.0755 psi |
| 25 bar | 362.5944 psi |
| 50 bar | 725.1887 psi |
| 100 bar | 1,450.38 psi |
| 250 bar | 3,625.94 psi |
| 500 bar | 7,251.89 psi |
| 1,000 bar | 14,503.77 psi |
Common questions
Is bar to psi 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 PSI to Bar converter.
Mistakes to avoid
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
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.
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.
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.
For any value, use the Bar to PSI Converter or browse all pressure converters.
Run your own numbers: Bar to PSI Converter