mbar to Inches of Water Converter

How to convert millibars to inches of water

FormulainH₂O = mbar × 0.401463076

Multiply the value in millibars by 0.401463076. To go the other way, multiply by 2.4908891 (or divide by 0.401463076).

A millibar is smaller than an inch of water: it takes 2.4908891 millibars to make one inch of water.

Worked examples

1 millibar1 mbar × 0.401463076 = 0.401463076 inH₂O
5 millibars5 mbar × 0.401463076 = 2.00731538 inH₂O
10 millibars10 mbar × 0.401463076 = 4.01463076 inH₂O
20 millibars20 mbar × 0.401463076 = 8.02926152 inH₂O
100 millibars100 mbar × 0.401463076 = 40.1463076 inH₂O

Millibars to inches of water conversion table

Values are calculated by the conversion engine and rounded to 8 significant figures.

Millibars to inches of water: 0.1–10 mbar
Millibars (mbar)	Inches of water (inH₂O)
0.1 mbar	0.040146308 inH₂O
0.25 mbar	0.10036577 inH₂O
0.5 mbar	0.20073154 inH₂O
1 mbar	0.40146308 inH₂O
2 mbar	0.80292615 inH₂O
3 mbar	1.2043892 inH₂O
4 mbar	1.6058523 inH₂O
5 mbar	2.0073154 inH₂O
6 mbar	2.4087785 inH₂O
7 mbar	2.8102415 inH₂O
8 mbar	3.2117046 inH₂O
9 mbar	3.6131677 inH₂O
10 mbar	4.0146308 inH₂O

Millibars to inches of water: 12–1,000 mbar
Millibars (mbar)	Inches of water (inH₂O)
12 mbar	4.8175569 inH₂O
15 mbar	6.0219461 inH₂O
20 mbar	8.0292615 inH₂O
25 mbar	10.036577 inH₂O
30 mbar	12.043892 inH₂O
40 mbar	16.058523 inH₂O
50 mbar	20.073154 inH₂O
75 mbar	30.109731 inH₂O
100 mbar	40.146308 inH₂O
250 mbar	100.36577 inH₂O
500 mbar	200.73154 inH₂O
1,000 mbar	401.46308 inH₂O

About the units

Millibar (mbar)

The millibar (mbar) is a unit of pressure in the metric system. One millibar equals 100 pascals (Pa).

Inch of water (inH₂O)

Conventional value 249.08891 Pa. HVAC duct static pressure and gas-appliance pressures use inches of water column.

Frequently asked questions

How many inches of water are in one millibar?

There are 0.401463076 inches of water in one millibar, and this value is exact by definition.

How do I convert millibars to inches of water?

Multiply the number of millibars by 0.401463076. For example, 10 mbar × 0.401463076 = 4.01463076 inH₂O.

How many millibars are in one inch of water?

One inch of water equals 2.4908891 millibars. That is the reverse factor, 1 ÷ 0.401463076.

What is 10 millibars in inches of water?

10 mbar = 4.01463076 inH₂O.

Is this mbar to inH₂O converter accurate?

Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.