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Inch of mercury to Standard atmosphere (inHg → atm)

Convert inch of mercury to standard atmosphere instantly. The conversion factor is approximate to engineering precision.

Realtime·pressure·imperial
Approx
inHg
× 0.0334
atm
0.033421
Precision [auto]
6

📐inHg to atm formulaApprox.

atm = inHg × 0.033421060943
Inverse: inHg = atm × 29.921252401895

Worked example: 1 inHg = 0.033421060943 atm

ℹ️About these units

Inch of mercury (inHg)
US weather barometric pressure.
Standard atmosphere (atm)
Source: 1 atm = 101 325 Pa exact (BIPM).

📊Reference table: inHg → atm

Inch of mercury (inHg)Standard atmosphere (atm)
10.033421
20.066842
50.167105
100.334211
150.501316
200.668421
250.835527
501.6711
1003.3421
2508.3553
50016.7105
75025.0658
1,00033.4211

Want a downloadable CSV? Append ?format=csv to the API /api/v1/table endpoint.

🔁Reverse & related

Reverse: atm → inHginHg → PainHg → kPainHg → MPainHg → hPainHg → barinHg → mbarinHg → psiinHg → ksi

🔌API & widget

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