hectopascal to inch of water at 4°C
Convert hectopascal (hPa) to inch of water at 4°C (inH₂O). Use an editable pressure converter, conversion formula, and reference table.
1 hPa = 0.401463076 inH₂O
Conversion formula
One hectopascal equals 0.401463076 inch of water at 4°C. Multiply your value in hectopascal by this factor to get inch of water at 4°C. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 hectopascal:5 × 0.401463076 = 2.00731538 inH₂O
Conversion table
| hectopascal (hPa) | inch of water at 4°C (inH₂O) |
|---|---|
| 0.01 | 0.00401463076 |
| 0.1 | 0.0401463076 |
| 1 | 0.401463076 |
| 2 | 0.802926152 |
| 5 | 2.00731538 |
| 10 | 4.01463076 |
| 25 | 10.0365769 |
| 50 | 20.0731538 |
| 100 | 40.1463076 |
| 1000 | 401.463076 |
About these measurements
Pressure is force per unit of area.
The base reference used here is the pascal. One hectopascal is 100 base units; one inch of water at 4°C is 249.08891 base units.
Important distinctions
Gauge and absolute pressures must not be mixed. This converts units without changing the reference pressure.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert hPa to inH₂O?
Multiply the quantity in hPa by 0.401463076. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the inch of water at 4°C to hectopascal converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
