Convert PSI to Millibar
Convert PSI to Millibar (mbar/hPa) for weather, aviation, and lab work using the exact 68.9476 factor.
How to Convert Psi to Millibar
To convert PSI to Millibar, multiply psi by 68.9476.
Conversion Formula:
value * 68.9476Understanding the Conversion
PSI to Millibar converts Imperial pressures to the millibar/hPa scale used in meteorology and aviation. Multiply psi by 68.9476. For instance, 14.7 psi ≈ 1,013.25 mbar (sea-level pressure), and 32 psi ≈ 2,206 mbar. Converting to mbar helps align with weather maps, altimeter settings, and atmospheric research data.
The conversion is reversible—divide mbar by 68.9476 to return to psi.
Conversion Examples
Example: Convert 14.7 psi to mbar
- Step 1: 14.7 × 68.9476 ≈ 1,013.25.
- Step 2: Result ≈ 1,013.25 mbar.
- Step 3: Matches sea-level pressure.
14.7 psi ≈ 1,013.25 mbar
Atmospheric reference.
Example: Convert 32 psi to mbar
- Step 1: 32 × 68.9476 ≈ 2,206.
- Step 2: Result ≈ 2,206 mbar.
- Step 3: Tire pressure in mbar scale.
32 psi ≈ 2,206 mbar
Tire pressure example.
Example: Convert 5 psi to mbar
- Step 1: 5 × 68.9476 ≈ 344.74.
- Step 2: Result ≈ 344.74 mbar.
- Step 3: Low pressure example.
5 psi ≈ 344.74 mbar
Lower-pressure scenario for HVAC/cleanroom.
Conversion Formula
Millibar is 1/1000 of a bar; converting from psi scales by 68.9476 to reach the millibar/hPa range.
Conversion Chart
| Psi | Millibar |
|---|---|
| 1 | 68.95 |
| 5 | 344.74 |
| 10 | 689.48 |
| 14.7 | 1013.25 |
| 20 | 1378.95 |
| 32 | 2206.32 |
| 50 | 3447.38 |
| 75 | 5171.07 |
| 100 | 6894.76 |
| 150 | 10342.14 |
Quick Conversion Tip
psi × 70 ≈ mbar for a rough check; use 68.9476 for accuracy.
Unit Definitions
Pound per Square Inch (psi)
Imperial pressure unit.
1 psi = 68.9476 mbar = 6.89476 kPa.
Millibar (mbar)
Atmospheric unit equal to hPa.
mbar to psi divide by 68.9476; mbar to kPa divide by 10; mbar to Pa multiply by 100.
Common Use Cases
- Weather and aviation: express psi readings in mbar/hPa.
- Research: convert Imperial data to atmospheric units.
- Building/cleanroom: show low pressures in mbar.
- Education: demonstrate psi-to-mbar scaling.
Frequently Asked Questions
Are mbar and hPa interchangeable?
Yes, 1 mbar = 1 hPa. Both equal 100 Pa.
Why convert psi to mbar?
Weather, aviation, and many instruments use mbar/hPa, so this keeps data consistent.
How do I reverse it?
Divide mbar by 68.9476 to get psi.