inH2O to mbar converter
1 inH2O = 2.49082 mbar
And 1 mbar = 0.401474 inH2O. Inches of water column to millibar.
Formula
mbar = inH2O × 2.49082
A reading of 15 inH2O is 15 × 2.49082 = 37.3623 mbar.
inH2O to mbar table
| inH2O | mbar |
|---|---|
| 1 inH2O | 2.49082 mbar |
| 5 inH2O | 12.4541 mbar |
| 10 inH2O | 24.9082 mbar |
| 15 inH2O | 37.3623 mbar |
| 30 inH2O | 74.7246 mbar |
| 50 inH2O | 124.541 mbar |
| 100 inH2O | 249.082 mbar |
| 500 inH2O | 1,245.41 mbar |
| 1,000 inH2O | 2,490.82 mbar |
mbar to inH2O table
| mbar | inH2O |
|---|---|
| 1 mbar | 0.401474 inH2O |
| 5 mbar | 2.00737 inH2O |
| 10 mbar | 4.01474 inH2O |
| 15 mbar | 6.02211 inH2O |
| 30 mbar | 12.0442 inH2O |
| 50 mbar | 20.0737 inH2O |
About these units
inH2O (inches of water column): Low duct and furnace pressures, at the conventional 4 °C water reference.
mbar (millibar): Used for weather, vacuum and low differential pressures.
Gauge pressure (psig, barg) is measured relative to the surrounding atmosphere; absolute pressure (psia, bara) is relative to vacuum. Converting units never changes that reference: absolute = gauge + about 14.696 psi (1.01325 bar) at sea level. Stress uses the same units: 1 MPa = 1 N/mm².
Convert mbar to inH2O instead · All pressure and stress conversions