Inches of mercury to Millimeters of mercury

1 inHg = 25.4 mmHg. Edit either value to convert instantly.

Value

From

1 inHg=mmHg

≈ 3,386.39 Pa

Decimal places

Conversion formula

mmHg = inHg × (3,386.388640341) × (200,000,000 / 2.6664477483 × 10¹⁰)

1 inHg = 25.4 mmHg

inch of mercury (inHg)

Inch of mercury is a unit of pressure: 1 inHg = 3,386.388640341 Pa. Uses the conventional mercury column at 0 °C under standard gravity.

Source: NIST SP 811, Appendix B.9: conversion factors by quantity

millimeter of mercury (mmHg)

Millimeter of mercury is a unit of pressure: 1 mmHg = 133.322387415 Pa. This is conventional mercury at 0 °C and standard gravity; 1 torr is slightly different.

Source: NIST SP 811, Appendix B.9: conversion factors by quantity

Conversion table

inHg	mmHg
	= 25.4
	= 50.8
	= 127
	= 254
	= 381
	= 508
	= 635
	= 762
	= 1,016
	= 1,143

inHg	mmHg
	= 1,270
	= 1,524
	= 1,778
	= 2,032
	= 2,286
	= 2,540
	= 3,810
	= 4,064
	= 4,318
	= 4,572

Frequently asked questions

How many millimeters of mercury are in 1 inch of mercury?

1 inHg = 25.4 mmHg. mmHg = inHg × (3,386.388640341) × (200,000,000 / 2.6664477483 × 10¹⁰)

How do I convert inHg to mmHg?

mmHg = inHg × (3,386.388640341) × (200,000,000 / 2.6664477483 × 10¹⁰)

Is 1 inch of mercury bigger than 1 millimeter of mercury?

1 inHg = 25.4 mmHg.

Related conversions

Reverse conversion: millimeters of mercury to inches of mercury pounds-force per square inch to bars