---
title: "Standard atmospheres to Inches of mercury converter"
description: "1 standard atmosphere = 29.92125 inches of mercury. Conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/atmospheres-to-inches-of-mercury/
site: "At One Place"
---

# Standard atmospheres to inches of mercury

**1 standard atmosphere in inches of mercury: 1 atm = 29.92125 inHg**

inHg = atm × 29.9212524

To convert standard atmospheres to inches of mercury, multiply by 29.9212524. The table below gives the values people look up most often, and the converter works for any number.

## Standard atmospheres to inches of mercury table

*Common standard atmosphere values converted to inches of mercury.*

| Standard atmospheres | Inches of mercury |
| --- | --- |
| 1 atm | 29.92125 |
| 2 atm | 59.8425 |
| 3 atm | 89.76376 |
| 4 atm | 119.685 |
| 5 atm | 149.6063 |
| 10 atm | 299.2125 |
| 15 atm | 448.8188 |
| 20 atm | 598.425 |
| 25 atm | 748.0313 |
| 30 atm | 897.6376 |
| 40 atm | 1,196.8501 |
| 50 atm | 1,496.0626 |
| 75 atm | 2,244.0939 |
| 100 atm | 2,992.1252 |
| 250 atm | 7,480.3131 |
| 500 atm | 14,960.626 |
| 1,000 atm | 29,921.252 |

## How the conversion works

The relationship is inHg = atm × 29.9212524. Both units measure pressure, so the conversion is a fixed factor that never changes.

## Common questions

### How many inches of mercury are in one standard atmosphere?

One standard atmosphere equals 29.92125 inches of mercury. inHg = atm × 29.9212524.

### How do you convert standard atmospheres to inches of mercury?

Use inHg = atm × 29.9212524. So 10 atm is 299.2125 inHg.

### How many standard atmospheres are in one inch of mercury?

One inch of mercury equals 0.033421 standard atmospheres, which is the reverse of the conversion above.

## Related pages

- [Inches of mercury to Standard atmospheres](https://atoneplace.net/convert/inches-of-mercury-to-atmospheres/)
- [Standard atmospheres to Pascals](https://atoneplace.net/convert/atmospheres-to-pascals/)
- [Standard atmospheres to Kilopascals](https://atoneplace.net/convert/atmospheres-to-kilopascals/)
- [Standard atmospheres to Bars](https://atoneplace.net/convert/atmospheres-to-bar/)
- [Standard atmospheres to Pounds per square inch](https://atoneplace.net/convert/atmospheres-to-psi/)
- [Standard atmospheres to Torrs](https://atoneplace.net/convert/atmospheres-to-torr/)

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)
- Calculated on this page — At One Place (/about/)