# Bar to psi converter

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

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

Bar is used on pumps and pressure equipment. A decimal bar reading can be converted for a gauge with another scale, but the equipment's specified reference and permissible range still apply. Do not confuse a pressure setting with a recommended operating value.

One bar is about 14.503773773 psi, so 2.2 bar is 31.908302 psi. To convert bar to psi, multiply by 14.503773773; to convert back, multiply by 0.0689475729.

The bar is defined as exactly 100,000 pascals (100 kPa). The factor has no exact decimal form, so results are computed with 50 significant digits and rounded only for display.

## Inputs

- **Bar (bar)**

## Results

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

## Formula

$$
\text{psi} = \text{bar} \times 14.503773773
$$

## Worked examples

### 2.2 bar to psi

- Bar (bar): 2.2 bar
- **Psi: 31.9083023006 psi**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 2 bar to psi

- Bar (bar): 2 bar
- **Psi: 29.007547546 psi**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 10 bar to psi

- Bar (bar): 10 bar
- **Psi: 145.03773773 psi**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert bar to psi?

Bar is used on pumps and pressure equipment. A decimal bar reading can be converted for a gauge with another scale, but the equipment's specified reference and permissible range still apply. Do not confuse a pressure setting with a recommended operating value.

### How many psi are in a bar?

One bar is about 14.503773773 psi. The bar is defined as exactly 100,000 pascals (100 kPa).

### How do you convert bar to psi?

Multiply the number of bar by 14.503773773. For example, 2.2 bar × 14.503773773 = 31.908302 psi. To go the other way, divide by 14.503773773.

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

Multiply by 14.5. That is 0.02602% low of the exact factor 14.503773773, so 2.2 bar comes out as 31.9 psi instead of 31.9083.

### How accurate is the bar to psi 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, “2.2 bar to psi” 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)