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Pressure to Head Unit Converter

Pressure vs. head units - like lb/in², atm, inches mercury, bars, Pa and more.

Convert between commonly used units for pressure and head:

Pressure to Head Unit Converter
from	Multiply by
	to
	lb/in²	lb/ft²	Atm	kg/cm²	kg/m²	in. water (68 ^oF)
lb/in²	1	144	0.068046	0.070307	703.070	27.7276
lb/ft²	0.0069444	1	0.000473	0.000488	4.88241	0.1926
Atm.	14.696	2116.22	1	1.0332	10332.27	407.484
kg/cm²	14.2233	2048.155	0.96784	1	10000	394.38
kg/m²	0.001422	0.204768	0.0000968	0.0001	1	0.03944
in. water (68 ^oF)	0.036092	5.1972	0.002454	0.00253	25.375	1
ft. water (68 ^oF)	0.432781	62.3205	0.029449	0.03043	304.275	12
in. mercury, inHg (31 ^oF)	0.491154	70.7262	0.033421	0.03453	345.316	13.6185
mm mercury, inHg (31 ^oF)	0.0193368	2.78450	0.0013158	0.0013595	13.59509	0.53616
Bars	14.5038	2088.55	0.98692	1.01972	10197.2	402.156
MPa	145.038	20885.5	9.8692	10.1972	101972.0	4021.56

Pressure to Head Unit Converter
from	Multiply by
	to
	ft. water (68 ^oF)	in. mercury (31 ^oF)	mm mercury (31 ^oF)	Bars	MPa
lb/in²	2.3106	2.03602	51.7150	0.06895	0.006895
lb/ft²	0.01605	0.014139	0.35913	0.000479	0.0000479
Atm	33.9570	29.921	760	1.01325	0.101325
kg/cm²	32.8650	28.959	735.559	0.98067	0.098067
kg/m²	0.003287	0.002896	0.073556	0.000098	0.0000098
in. water (68 ^oF)	0.08333	0.073430	1.8651	0.00249	0.000249
ft. water (68 ^oF)	1	0.88155	22.3813	0.029839	0.0029839
in. mercury, inHg (31 ^oF)	1.1349	1	25.40005	0.033864	0.0033864
mm mercury, inHg (31 ^oF)	0.044680	0.03937	1	0.001333	0.0001333
Bars	33.5130	29.5300	750.062	1	0.10
MPa	335.130	295.300	7500.62	10.0	1

Example - Convert Head in inHg to Pressure MPa

Atmospheric pressure is measured to 29.92 inHg. According the table above - to convert this value to MPa it must be multiplied with 0.0033864.

(29.92 inHg) 0.0033864 = 0.1013 MPa (1.013×10⁵ Pa)

Download kPa to bar, psi, mmH2O and inH2O chart

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