inches of mercury to atmospheres
Convert inch of mercury to atmosphere — instant, free, with the formula shown.
How to convert inch of mercury to atmosphere
To convert inch of mercury to atmosphere, multiply by 0.03342106:
For example, 10 inHg × 0.033421 = 0.334211 atm.
inHg to atm conversion table
| inches of mercury (inHg) | atmospheres (atm) |
|---|---|
| 1 inHg | 0.033421 atm |
| 2 inHg | 0.066842 atm |
| 5 inHg | 0.167105 atm |
| 10 inHg | 0.334211 atm |
| 25 inHg | 0.835527 atm |
| 50 inHg | 1.671053 atm |
| 100 inHg | 3.342106 atm |
| 250 inHg | 8.355265 atm |
| 500 inHg | 16.71053 atm |
| 1000 inHg | 33.421061 atm |
Other inch of mercury conversions
Convert to atmosphere from another unit
inHg to atm — frequently asked
How many atmospheres are in 1 inch of mercury?
1 inch of mercury = 0.033421 atmospheres (inHg × 0.033421 = atm).
What is the formula to convert inch of mercury to atmosphere?
Multiply your inch of mercury value by 0.03342106 to get atmosphere.
How do I convert 10 inches of mercury to atmospheres?
10 inHg = 0.334211 atm. For 100 inHg the answer is 3.342106 atm. Use the calculator on this page for any other value.
When to convert inch of mercury to atmosphere
Pressure conversion — common questions
What's the difference between bar and psi?
1 bar = 100,000 Pa ≈ 14.504 psi. Bar is metric/SI-friendly; psi is US imperial. Tire pressure in cars is commonly 30–35 psi or ≈ 2.1–2.4 bar.
Is 1 atmosphere the same as 1 bar?
Very close but not identical. 1 atm = 1.01325 bar = 101,325 Pa. 1 bar = 100,000 Pa.
Why is blood pressure in mmHg?
Historically measured with mercury manometers — the pressure that supports a column of mercury that many millimetres tall. 120 mmHg systolic ≈ 16 kPa.