Convert psi to inches of mercury

1 psi=2.03602inHg

Use the converter below to change any psi value into inches of mercury instantly — with formula, conversion table, and real-world examples.

You have

Equals

2.03602

Conversion formula

Forward

inches of mercury = psi × 2.03602

Reverse

psi = inches of mercury × 0.4912

Example: 10 psi × 2.03602 = 20.3602 inHg.

About both units

From

Pound per Square Inch

psi

Pounds per square inch equals approximately 6895 Pa. It is the dominant pressure unit in the US — tyre pressures, plumbing, compressed air. Standard US tyre pressure: 32–35 psi.

Real-world: US tyre: 32–35 psi. Water supply: 40–60 psi. SCUBA tank: 3000 psi. Car AC system: 30–200 psi.

Read full pound per square inch reference →

Inch of Mercury

inHg

The inch of mercury equals about 3386 Pa. Used in US barometers, US aviation altimeter settings and some engineering. Standard sea-level pressure: 29.92 inHg.

Real-world: Sea-level standard: 29.92 inHg. Mountain pass at 3000 m: ~21 inHg. US aviation QNH given in inHg.

Read full inch of mercury reference →

Pound per Square Inch to Inch of Mercury conversion table

Common psi to inches of mercury values for quick reference.

Pound per Square Inch (psi)	Inch of Mercury (inHg)
1 psi	2.03602 inHg
5 psi	10.1801 inHg
10 psi	20.3602 inHg
25 psi	50.9005 inHg
50 psi	101.801 inHg
100 psi	203.602 inHg
200 psi	407.204 inHg
500 psi	1,018.01 inHg
1,000 psi	2,036.02 inHg
5,000 psi	10,180.1 inHg

Tips & common mistakes

Quick tips

1 psi ≈ 6.9 kPa = 0.069 bar.
14.7 psi = 1 atm = 1.01 bar.
Most US pressure gauges show psi.

Avoid these

Setting a European tyre at 35 bar instead of 35 psi — disaster.
Confusing psi (gauge) with psia (absolute).
Using psi in scientific papers — prefer Pa or MPa.

Frequently asked questions

How many inches of mercury in a pound per square inch?

One pound per square inch equals 2.03602 inches of mercury.

How do I convert psi to inches of mercury?

Multiply the pound per square inch value by 2.03602 to get the equivalent in inches of mercury.

What is 100 psi in inches of mercury?

100 psi equals 203.602 inches of mercury.

Is a pound per square inch bigger than a inch of mercury?

Yes. 1 pound per square inch equals 2.03602 inches of mercury, so one pound per square inch is larger.

How to convert psi to inches of mercury without a calculator?

Multiply by 2.04 for a quick estimate; use a calculator for precise results.

Related pressure conversions

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