Fast reference
TL;DR
Pressure conversions are easiest through pascals: 1 bar = 100,000 Pa, 1 kPa = 1,000 Pa, and 1 psi is about 6,894.757 Pa.
Use for
Pressure Conversion
Best next step
Check the table, then calculate
Reviewed
2026-07-04
Guide
Overview
A pressure conversion chart for PSI, bar, kPa and pascals with formulas, common mistakes and links to pressure calculators.
Use Pa as the base unit when checking pressure factors. Engineering work often uses kPa or bar for readability.
- Use the chart for fast checks.
- Use the linked calculator for custom values.
- Keep the unit definition clear before rounding.
- Record the source when values enter technical work.
Reference table
Pressure unit formula chart
Use Pa as the base unit when checking pressure factors. Engineering work often uses kPa or bar for readability.
| Unit | Pascals | Common formula |
|---|---|---|
| 1 Pa | 1 Pa | base SI derived unit |
| 1 kPa | 1,000 Pa | kPa x 1000 |
| 1 bar | 100,000 Pa | bar x 100000 |
| 1 psi | 6,894.757 Pa | psi x 6894.757 |
| 1 atm | 101,325 Pa | atm x 101325 |
Workflow
How to use this reference
Pressure work often appears in tires, hydraulics, weather, vacuum systems and process engineering.
Step 1
Choose gauge or absolute pressure before converting.
Step 2
Convert through Pa or kPa for SI consistency.
Step 3
Use bar for common equipment labels and psi for inch-pound systems.
Step 4
Keep enough significant digits for safety margins.
Quality check
Common mistakes to avoid
Gauge versus absolute pressure is the most common context error.
FAQ
Common questions
How many kPa are in 1 psi?
1 psi is approximately 6.89476 kPa.
Is bar an SI unit?
Bar is not an SI unit, but it is commonly used and equals exactly 100,000 Pa.
What is the difference between Pa and kPa?
1 kPa equals 1,000 Pa, making kPa more readable for many engineering pressures.
Reference trail
Sources
Reference sources checked on 2026-07-04.