# Psi to bar converter

> Convert psi to bar (psi to bar) with the exact factor, a conversion chart and worked steps.

Interactive version: https://www.calcopenly.com/conversion/psi-to-bar
Subject: Unit converters

A pressure marked psi may appear on a tire placard, gauge or component rating. Preserve whether that reading is gauge or absolute pressure when converting. Changing the unit does not remove the atmospheric offset between those pressure references.

One pound per square inch is about 0.0689475729 bar, so 32 psi is 2.206322 bar. To convert psi to bar, multiply by 0.0689475729; to convert back, multiply by 14.503773773.

One psi is one pound-force per square inch, about 6,894.757 pascals. The factor has no exact decimal form, so results are computed with 50 significant digits and rounded only for display.

## Inputs

- **Psi (psi)**

## Results

- Bar (bar) — main result
- Conversion
- 1 bar in psi (psi)

## Formula

$$
\text{bar} = \text{psi} \times 0.0689475729317
$$

## Worked examples

### 32 psi to bar

- Psi (psi): 32 psi
- **Bar: 2.2063223338 bar**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 25 psi to bar

- Psi (psi): 25 psi
- **Bar: 1.7236893233 bar**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 100 psi to bar

- Psi (psi): 100 psi
- **Bar: 6.8947572932 bar**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert psi to bar?

A pressure marked psi may appear on a tire placard, gauge or component rating. Preserve whether that reading is gauge or absolute pressure when converting. Changing the unit does not remove the atmospheric offset between those pressure references.

### How many bar are in a pound per square inch?

One pound per square inch is about 0.0689475729 bar. One psi is one pound-force per square inch, about 6,894.757 pascals.

### How do you convert psi to bar?

Multiply the number of psi by 0.0689475729. For example, 32 psi × 0.0689475729 = 2.206322 bar. To go the other way, divide by 0.0689475729.

### How can I estimate psi to bar without a calculator?

Multiply by 0.07. That is 1.5% high of the exact factor 0.0689475729, so 32 psi comes out as 2.24 bar instead of 2.2063.

### How accurate is the psi to bar converter?

Accuracy depends on your inputs and the method's assumptions. Decimal arithmetic uses 50 significant digits, but estimates, numerical methods and source data can be less precise; the displayed rounding does not remove those limits. It is checked against 3 worked examples whose answers come from independent sources; for example, “32 psi to bar” is checked against Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions).

### Where does the method come from?

NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B; NIST Handbook 44, Appendix C: General tables of units of measurement; BIPM, The International System of Units (SI Brochure), 9th edition.

## Sources

- [NIST SP 811 (2008), Guide for the Use of the International System of Units, Appendix B](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C: General tables of units of measurement](https://www.nist.gov/pml/weights-and-measures/publications/nist-handbooks/handbook-44)
- [BIPM, The International System of Units (SI Brochure), 9th edition](https://www.bipm.org/en/publications/si-brochure)