---
title: "Tubing unit converter: pressure, size and temperature"
canonical: "https://yuannaitube.com/tubing-unit-converter/"
language: "en-US"
---

TOOLS

# Tubing unit converter: pressure, size and temperature

Convert pressure, tubing size and temperature, and work out wall thickness from OD and ID. The results are plain arithmetic. When you quote a rated pressure, use the value and unit exactly as printed on the data sheet.

## Common conversions

| bar | psi | MPa | kgf/cm² |
| --- | --- | --- | --- |
| 1 | 14.50 | 0.1 | 1.020 |
| 6 | 87.02 | 0.6 | 6.118 |
| 10 | 145.04 | 1 | 10.197 |
| 16 | 232.06 | 1.6 | 16.315 |
| 20 | 290.08 | 2 | 20.394 |
| 41 | 594.65 | 4.1 | 41.808 |

| Inch size | mm |
| --- | --- |
| 1/8 in | 3.175 |
| 1/4 in | 6.35 |
| 3/8 in | 9.525 |
| 1/2 in | 12.7 |
| 3/4 in | 19.05 |

## Metric and inch tubing sizes are not interchangeable

A metric OD and the nearest inch OD differ by a few tenths of a millimeter, more than the ±0.10 mm tolerance on our nylon tubing. A tube and fitting must come from the same size system.

| Metric OD | Nearest inch OD | Difference |
| --- | --- | --- |
| 6 mm | 1/4 in (6.35 mm) | 0.35 mm |
| 10 mm | 3/8 in (9.525 mm) | 0.475 mm |
| 12 mm | 1/2 in (12.7 mm) | 0.70 mm |

## Related pages

- [Tubing size chart](<https://yuannaitube.com/tubing-size-chart/>) : every OD, ID and wall we list, with working pressure.

- [Compressed air flow calculator](<https://yuannaitube.com/compressed-air-flow-calculator/>) : air velocity and pressure drop for a given tube size, length and flow.

- [Pressure and temperature guide](<https://yuannaitube.com/working-pressure-temperature-review/>) : derating by temperature.

- [Tubing glossary](<https://yuannaitube.com/tubing-glossary/>) : what OD, ID, working pressure and burst pressure mean.

- [Data sheets](<https://yuannaitube.com/product-data-sheets/>) : rated values as printed.

Need a size or pressure confirmed for your line?  [Send your requirements](<https://yuannaitube.com/contact/>) .