---
title: "Standard atmospheres to Bars — atm to bar converter"
description: "1 standard atmosphere = 1.01325 bars. Convert standard atmospheres to bars with a full conversion table, the exact formula, and a calculator for any value."
url: https://atoneplace.net/convert/atmospheres-to-bar/
site: "At One Place"
---

# Standard atmospheres to bars

**1 standard atmosphere in bars: 1 atm = 1.01325 bar**

bar = atm × 1.01325

To convert standard atmospheres to bars, multiply by 1.01325. The table below gives the values people look up most often, and the converter works for any number.

## Standard atmospheres to bars table

*Common standard atmosphere values converted to bars.*

| Standard atmospheres | Bars |
| --- | --- |
| 1 atm | 1.01325 |
| 2 atm | 2.0265 |
| 3 atm | 3.03975 |
| 4 atm | 4.053 |
| 5 atm | 5.06625 |
| 10 atm | 10.1325 |
| 15 atm | 15.19875 |
| 20 atm | 20.265 |
| 25 atm | 25.33125 |
| 30 atm | 30.3975 |
| 40 atm | 40.53 |
| 50 atm | 50.6625 |
| 75 atm | 75.99375 |
| 100 atm | 101.325 |
| 250 atm | 253.3125 |
| 500 atm | 506.625 |
| 1,000 atm | 1,013.25 |

## How the conversion works

The relationship is bar = atm × 1.01325. Both units measure pressure, so the conversion is a fixed factor that never changes.

## Common questions

### How many bars are in one standard atmosphere?

One standard atmosphere equals 1.01325 bars. bar = atm × 1.01325.

### How do you convert standard atmospheres to bars?

Use bar = atm × 1.01325. So 10 atm is 10.1325 bar.

### How many standard atmospheres are in one bar?

One bar equals 0.98692 standard atmospheres, which is the reverse of the conversion above.

## Related pages

- [Bars to Standard atmospheres](https://atoneplace.net/convert/bar-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 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/)