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General Engineering2D

Pressure Unit Converter

Convert between pressure units: Pa, kPa, MPa, bar, psi, atm, kg/cm², and mmH₂O.

Inputs
Enter your values below
Result
Converted Pressure
—
Enter values and click Calculate
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Formula
input × fromFactor ÷ toFactor

Converts pressure via Pascal reference: result = input × (Pa_per_fromUnit / Pa_per_toUnit). Factors are Pa per unit: Pa=1, kPa=1000, bar=100000, psi=6895, atm=101325.

Introduction

Convert between common engineering pressure units. Standard pressure unit conversions for hydraulic, pneumatic, process, and mechanical engineering.

How This Calculator Works

Converts pressure via Pascal reference: result = input × (Pa_per_fromUnit / Pa_per_toUnit). Factors are Pa per unit: Pa=1, kPa=1000, bar=100000, psi=6895, atm=101325.

Step-by-step process:

  1. Enter your input values in the calculator above
  2. The engine converts all inputs to SI base units (meters, kg, Pa)
  3. The formula is evaluated: input * fromFactor / toFactor
  4. Result is formatted with the appropriate unit and precision

Calculation Example

100 kPa = 14.5 psi (approximately 1 atmosphere).

Inputs: input=100, fromFactor=1000, toFactor=6894.76
Result: 14.5

Engineering Applications

  • •Hydraulic system design
  • •Process instrumentation
  • •Pneumatic systems
  • •International standards

Frequently Asked Questions

What is the exact conversion from bar to psi?

1 bar = 14.5038 psi = 100 kPa = 0.9869 atm. 1 bar is slightly less than 1 atmosphere (1 atm = 1.01325 bar).

What is the difference between gauge and absolute pressure?

P_abs = P_gauge + P_atm. 100 kPa gauge = ~201.3 kPa absolute. This converter works with both, just be consistent.

How do I convert between kPa and bar?

1 bar = 100 kPa. For example, 5 bar = 500 kPa. Conversely, divide kPa by 100 to get bar.

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Engineering Disclaimer: Calculations are for reference and educational purposes only. Always verify results independently for engineering design. See full disclaimer.
Reviewed by: Industrial Engineering Team
References: ASME B31.3, ASTM A36, Perry's Chemical Engineers' Handbook