Pressure

bartomH₂O

Convert bar (bar) to metres of water column (mH₂O).

Factor1 bar = 10.19716 mH₂O

Converter

Input

bar

Accepts numbers or expressions, e.g. 150 + 14.7

Result

10.1972mH₂O

Rendered to 6 significant figures.

Formula

mH₂O = bar × 10.19716

Multiply any value in bar by 10.19716 to obtain the value in metres of water column.

Worked example

Convert 1 bar to mH₂O.

01Start with 1 bar.
02Multiply by the conversion factor: 1 × 10.19716 = 10.1972 mH₂O.

Result1 bar = 10.1972 mH₂O

Conversion table

bar	mH₂O
1	10.197
2	20.394
5	50.986
10	101.97
20	203.94
50	509.86
100	1019.7
200	2039.4
500	5098.6
1000	10197

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from bar to mH₂O?

1 bar equals 10.19716 mH₂O. To convert, multiply the value in bar by 10.19716.

How do I convert 1 bar to mH₂O?

1 bar = 10.1972 mH₂O. For any value, multiply by 10.19716.

How do I convert mH₂O back to bar?

Divide by the same factor — or equivalently, multiply by 0.0980665. So 1 mH₂O = 0.0980665 bar.

When would I need to convert bar to metre of water column?

Pressure conversions between bar and mH₂O 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).

Pump head & pressure context

This is a fixed water-column conversion. “Water column” units (m wc, ft wc) assume the density of water at a standard reference temperature, so the ratio between pressure and head here is constant. That assumption is exactly why this page is deterministic.

For any other fluid — brine, oil, slurry, or hot water — the head ↔ pressure relationship depends on the fluid density (ΔP = ρ × g × h). Use the SG/density-aware Head ↔ Pressure calculator for those cases rather than a fixed water-column factor.

Head ↔ Pressure Calculator →Pressure vs Head →What Is Pump Head? →Pump Sizing →