Pressure
hPatobar
Convert hectopascals (hPa) to bar (bar).
Factor1 hPa = 0.001 bar
Converter
hPa
Accepts numbers or expressions, e.g. 150 + 14.7
Result
bar
Rendered to 6 significant figures.
Formula
Formula
bar = hPa × 0.001
Multiply any value in hectopascals by 0.001 to obtain the value in bar.
Worked example
Convert 1000 hPa to bar.
- 01Start with 1000 hPa.
- 02Multiply by the conversion factor: 1000 × 0.001 = 1 bar.
Result1000 hPa = 1 bar
Conversion table
| hPa | bar |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 500 | 0.5 |
| 1000 | 1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from hPa to bar?
1 hPa equals 0.001 bar. To convert, multiply the value in hectopascals by 0.001.
How do I convert 1 hPa to bar?
1 hPa = 0.001 bar. For any value, multiply by 0.001.
How do I convert bar back to hPa?
Divide by the same factor — or equivalently, multiply by 1000. So 1 bar = 1000 hPa.
When would I need to convert hectopascal to bar?
Pressure conversions between hPa and bar are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).