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Convert Inches of Mercury to Millimeters of Mercury

1 inch of mercury = 25.400003 millimeters of mercury. Type any value below to convert in either direction — the calculation happens in your browser.

Inches of Mercury to Millimeters of Mercury formula

Multiply the number of inches of mercury by 25.400003 to get millimeters of mercury.

millimeters of mercury = inches of mercury × 25.400003

To go the other way: divide the number of millimeters of mercury by 25.400003, or multiply by 0.03937007.

inches of mercury = millimeters of mercury ÷ 25.400003

Inches of Mercury to Millimeters of Mercury conversion table

Inches of MercuryMillimeters of Mercury
1 inHg25.400003 mmHg
2 inHg50.800005 mmHg
3 inHg76.200008 mmHg
4 inHg101.600011 mmHg
5 inHg127.000013 mmHg
6 inHg152.400016 mmHg
7 inHg177.800019 mmHg
8 inHg203.200022 mmHg
9 inHg228.600024 mmHg
10 inHg254.000027 mmHg
15 inHg381.00004 mmHg
20 inHg508.000054 mmHg
25 inHg635.000067 mmHg
30 inHg762.000081 mmHg
40 inHg1,016 mmHg
50 inHg1,270 mmHg
75 inHg1,905 mmHg
100 inHg2,540 mmHg
250 inHg6,350.001 mmHg
500 inHg12,700 mmHg
1,000 inHg25,400 mmHg

Millimeters of Mercury to Inches of Mercury conversion table

Millimeters of MercuryInches of Mercury
1 mmHg0.03937007 inHg
2 mmHg0.07874015 inHg
3 mmHg0.1181102 inHg
4 mmHg0.1574803 inHg
5 mmHg0.1968504 inHg
6 mmHg0.2362204 inHg
7 mmHg0.2755905 inHg
8 mmHg0.3149606 inHg
9 mmHg0.3543307 inHg
10 mmHg0.3937007 inHg

About the inch of mercury

Inches of mercury are used in US aviation altimeter settings and barometric reports.

About the millimeter of mercury

A millimetre of mercury is the unit of blood pressure and vacuum measurement, about 133.3 pascals.

Frequently asked questions

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

There are 25.400003 millimeters of mercury in one inch of mercury.

How many inches of mercury are in a millimeter of mercury?

There are 0.03937007 inches of mercury in one millimeter of mercury.

Is this conversion exact?

The ratio between the inch of mercury and the millimeter of mercury is fixed by definition, so the conversion is exact — the figures shown here are rounded for readability only.

What is 10 inches of mercury in millimeters of mercury?

10 inches of mercury equals 254.000027 millimeters of mercury.

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