Bar to Standard atmosphere Converter (and vice versa)

Created by: tinycalcs.com/en
Number of supported units: 2
Last update: 2026

This converter allows you to convert bar to standard atmospheres [atm] or standard atmospheres [atm] to bar. Calculations are performed in both directions. The calculation result and the entered value are displayed with up to 20 decimal places for maximum accuracy.

1 bar ≈ 0.9869 standard atmospheres [atm]1 standard atmosphere [atm] ≈ 1.0133 bar

Convert bar to standard atmospheres

There are two simple ways to convert bar to standard atmospheres [atm]. In the first calculation method, the value in bar is divided by the rounded conversion factor of 1.0133. The second method multiplies the value in bar by the rounded conversion factor of 0.9869.

  • Standard atmospheres [atm] ≈ bar ÷ 1.0133
  • Standard atmospheres [atm] ≈ bar * 0.9869

However, rounded conversion values are only suitable for rough conversions, as rounding errors can occur in the calculation result. The most accurate conversion of bar to standard atmospheres [atm] can be achieved using the following calculation method.

Standard atmospheres [atm] = bar ÷ 101,325 * 105

Convert standard atmospheres to bar

Converting standard atmospheres [atm] to bar is easy and can be done in two ways. The first method involves multiplication, in which the value in standard atmospheres [atm] is multiplied by the rounded conversion factor of 1.0133. The second variant is a division. Here, the value in standard atmospheres [atm] is divided by the rounded conversion factor of 0.9869.

  • Bar ≈ standard atmospheres [atm] * 1.0133
  • Bar ≈ standard atmospheres [atm] ÷ 0.9869

However, rounded conversion values do not allow for exact calculations because rounding errors can occur in the calculation result. The most accurate conversion of standard atmospheres [atm] to bar can be achieved using the following calculation method.

Bar = standard atmospheres [atm] * 101,325 ÷ 105

Converter

Decimal places

How it's calculated

Factor: 
≈ 1.013
Standard atmospheres = Bar ÷ 101,325 * 105
Bar = Standard atmospheres * 101,325 ÷ 105

To all available units

Decapascals

Gigapascals

Decapascals

Megapascals

Decapascals

Millimeters of mercury

Decapascals

Newtons per square millimeter

Decapascals

Psi

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