# Kilopascals to psi converter

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

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

Kilopascals provide an SI-based pressure scale used in specifications and weather data. Before comparing a reading with another gauge, identify whether both readings use the same pressure reference. A unit conversion alone does not correct for altitude or sensor calibration.

One kilopascal is about 0.1450377377 psi, so 220 kPa is 31.908302 psi. To convert kPa to psi, multiply by 0.1450377377; to convert back, multiply by 6.8947572932.

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

- **Kilopascals (kPa)**

## Results

- Psi (psi) — main result
- Conversion
- 1 psi in kilopascals (kPa)

## Formula

$$
\text{psi} = \text{kilopascals} \times 0.14503773773
$$

## Worked examples

### 220 kPa to psi

- Kilopascals (kPa): 220 kPa
- **Psi: 31.9083023006 psi**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 200 kPa to psi

- Kilopascals (kPa): 200 kPa
- **Psi: 29.007547546 psi**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

### 500 kPa to psi

- Kilopascals (kPa): 500 kPa
- **Psi: 72.5188688651 psi**
- Checked against: Exact-fraction computation from the legal unit definitions (scripts/gen-pairs.py, Python fractions)

## Questions

### When would I convert kPa to psi?

Kilopascals provide an SI-based pressure scale used in specifications and weather data. Before comparing a reading with another gauge, identify whether both readings use the same pressure reference. A unit conversion alone does not correct for altitude or sensor calibration.

### How many psi are in a kilopascal?

One kilopascal is about 0.1450377377 psi. One psi is one pound-force per square inch, about 6,894.757 pascals.

### How do you convert kPa to psi?

Multiply the number of kilopascals by 0.1450377377. For example, 220 kPa × 0.1450377377 = 31.908302 psi. To go the other way, divide by 0.1450377377.

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

Multiply by 0.145. That is 0.02602% low of the exact factor 0.1450377377, so 220 kPa comes out as 31.9 psi instead of 31.9083.

### How accurate is the kilopascals 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, “220 kPa 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)