Overview
Convert pressure values between pascals, kilopascals, bar and psi.
Objective
Use the correct measurements, units and method to produce an accurate, clearly labelled result.
What You Need
- A pressure value
- Starting and target units
- Conversion factor
- Calculator
Before You Start
Write down the value or dimensions you have, including their units. Decide exactly what unit or result you need before calculating. Keeping the units visible makes errors much easier to spot.
How to Do It
- Identify the pressure units.
- Use the correct factor for those units.
- Multiply or divide carefully.
- Keep suitable decimal precision.
- Check the final unit.
Worked Example
Convert 250 kPa to bar. Since 1 bar = 100 kPa, 250 ÷ 100 = 2.5 bar.
Useful Tips
- 1000 Pa = 1 kPa.
- 100 kPa = 1 bar.
- Use the manufacturer's specified unit when checking equipment.
Common Mistakes
- Confusing kPa and Pa.
- Using an approximate psi conversion when high precision is required.
- Leaving the answer without a unit.
Important Notes
Conversion factors and measurement standards can vary by country or context. When accuracy matters, confirm the standard being used and keep enough decimal places until the final answer.
FAQ
When should I round the answer?
Keep the full value during the calculation and round at the end to a level of precision suitable for the task.
Why should I always write the units?
The unit tells you what the number represents and helps reveal mistakes when converting or calculating.