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Pressure Converter

Instantly convert between 30+ pressure units including Pascal (Pa), Kilopascal (kPa), Megapascal (MPa), Bar, PSI, Atmosphere (atm), Torr, mmHg, inHg, kg/cm², inH₂O, ftH₂O and many more.

30+
Pressure Units
Instant
Live Conversion
100%
Accurate Factors

Why Use This Pressure Converter?

  • ✓ Supports 30+ internationally recognized pressure units.
  • ✓ Ideal for engineering, hydraulics, pneumatics, weather forecasting, HVAC, laboratories, and industrial applications.
  • ✓ Convert instantly between SI, Imperial, Atmospheric, Vacuum, and Technical pressure units.
  • ✓ Batch conversion, conversion ledger, CSV export, copy & share features included.

On This Page

Pressure Converter Conversion Table Batch Converter Pressure Formula Quick Reference Pressure Units FAQs Related Calculators

Pressure Converter

Quick Presets

About Pressure Conversion

Pressure is defined as the amount of force applied per unit area. Different industries use different pressure units depending on their applications. Engineers often work with Pascals and Bar, automotive professionals commonly use PSI, while weather forecasting frequently uses millibars and hectopascals.

Conversion Result

Converted Pressure
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From
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To
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Factor
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Conversion Summary

Enter a pressure value to begin conversion.

Complete Pressure Conversion Table

Pressure Unit Symbol Converted Value

Batch Pressure Converter

Enter one pressure value per line. The converter will instantly convert every value into the selected pressure unit.

Pressure Conversion Formula

Convert to Base Unit (Pascal)

Pressure (Pa) = Input Pressure × Conversion Factor

Convert to Target Unit

Target Pressure = Pressure (Pa) ÷ Target Unit Factor

General Formula

Converted Value = (Input × From Factor) ÷ To Factor

Worked Example

Convert 100 PSI to Bar

100 × 6894.757293 Pa
÷ 100000

= 6.8948 Bar

Quick Pressure Reference

Conversion Equivalent
1 Pascal (Pa) 1 N/m²
1 Kilopascal (kPa) 1000 Pa
1 Megapascal (MPa) 1000 kPa
1 Bar 100,000 Pa
1 Atmosphere (atm) 101,325 Pa
1 PSI 6,894.757 Pa
1 Torr 133.322 Pa
1 mmHg 133.322 Pa
1 inHg 3,386.389 Pa
1 inH₂O 249.089 Pa
1 kg/cm² 98,066.5 Pa
1 Technical Atmosphere (at) 98,066.5 Pa

Engineering Applications

  • Hydraulic systems
  • Pneumatic equipment
  • Mechanical engineering
  • Pressure vessel design
  • Industrial automation

Common Industries

  • Oil & Gas
  • HVAC Systems
  • Automotive Engineering
  • Weather & Meteorology
  • Laboratory & Scientific Research

Pressure Units Explained

Pressure is the amount of force applied perpendicular to a surface per unit area. It is one of the most important measurements in engineering, fluid mechanics, weather forecasting, hydraulics, pneumatics, manufacturing, and scientific research. Different industries use different pressure units depending on standards and applications.

📐 SI Units

  • Pascal (Pa) — SI base unit of pressure.
  • Kilopascal (kPa) — Common in HVAC, meteorology, and engineering.
  • Megapascal (MPa) — Used for hydraulic systems, material strength, and industrial equipment.
  • Gigapascal (GPa) — Primarily used for material science and elastic modulus calculations.
  • Newton per Square Meter (N/m²) — Equivalent to one Pascal.
  • Newton per Square Millimeter (N/mm²) — Frequently used in mechanical engineering.

🌍 Metric & Technical Units

  • Bar — Standard industrial pressure unit.
  • Millibar (mbar) — Common in meteorology.
  • Technical Atmosphere (at) — Engineering applications.
  • kg/cm² — Hydraulic and industrial machinery.
  • kg/m² — Low-pressure engineering calculations.

🇺🇸 Imperial Units

  • Pounds per Square Inch (PSI) — Automotive tires, compressors, gas cylinders.
  • KSI — Material strength and structural engineering.
  • Pounds per Square Foot (psf) — Building engineering.
  • Ounces per Square Inch (oz/in²) — Low-pressure systems.

🧪 Vacuum & Laboratory Units

  • Atmosphere (atm) — Standard atmospheric pressure.
  • Torr — Vacuum systems and laboratories.
  • Millimeter of Mercury (mmHg) — Medical and laboratory pressure.
  • Inch of Mercury (inHg) — Aviation and weather instruments.
  • Micron — High-vacuum engineering.
  • Inch / Foot of Water (inH₂O, ftH₂O) — Ventilation and HVAC systems.

Pressure Unit Comparison

Category Popular Units Common Applications
SI Pa, kPa, MPa Engineering, Physics, Science
Industrial Bar, kg/cm² Hydraulics, Pneumatics, Manufacturing
Imperial PSI, KSI Automotive, Mechanical Engineering
Atmospheric atm, mbar Weather Forecasting
Vacuum Torr, mmHg, Micron Laboratories, Semiconductor Industry
HVAC inH₂O, ftH₂O Air Conditioning & Ventilation

Where Pressure Conversion Is Used

🏭 Industrial Engineering

Pressure conversion is essential for hydraulic presses, pumps, compressors, industrial automation, and manufacturing systems.

🚗 Automotive

Vehicle tire pressure, braking systems, fuel injection, and turbochargers commonly use PSI and Bar.

🌦 Meteorology

Weather stations report atmospheric pressure using hPa, mbar, and atm to monitor changing weather conditions.

🧪 Scientific Research

Researchers convert between SI and laboratory pressure units during experiments and simulations.

❄ HVAC Systems

Heating, ventilation, and air-conditioning systems frequently use inches of water and Pascals for airflow measurements.

🚀 Aerospace

Aircraft cabins, rockets, satellites, and space systems require accurate pressure calculations using multiple engineering standards.

Worked Examples

Example 1 — Convert 100 PSI to Bar

100 × 6,894.757 Pa ÷ 100,000 = 6.8948 Bar

Example 2 — Convert 1 Atmosphere to kPa

1 atm = 101.325 kPa

Example 3 — Convert 760 Torr to Atmosphere

760 Torr = 1 atm

Best Practices & Common Mistakes

✅ Best Practices

  • Use Pascals for scientific and SI-based calculations.
  • Use PSI for automotive and US engineering applications.
  • Use Bar for industrial equipment and hydraulic systems.
  • Maintain higher decimal precision for engineering calculations.
  • Verify pressure ratings before converting safety-critical values.

❌ Common Mistakes

  • Confusing PSI with PSF.
  • Treating Bar and Atmosphere as identical values.
  • Mixing gauge pressure with absolute pressure.
  • Using rounded conversion factors in engineering design.
  • Ignoring unit differences in international specifications.

Frequently Asked Questions

The SI unit of pressure is the Pascal (Pa), which is equal to one Newton per square meter (N/m²).
1 Bar = 100,000 Pascals (Pa). Bar is widely used in industrial and hydraulic systems.
PSI (Pounds per Square Inch) is commonly used in the United States, while Bar is widely used in Europe and industrial engineering. One PSI equals approximately 0.06895 Bar.
Standard atmospheric pressure is 101,325 Pascals, which equals 1 atm, 1.01325 Bar, or approximately 14.696 PSI.
Torr is a pressure unit primarily used in vacuum systems. One atmosphere equals exactly 760 Torr.
For most engineering and laboratory applications, 1 mmHg ≈ 1 Torr. Their values differ only by a very small amount.
Most vehicles in the United States use PSI, while many European manufacturers also specify tire pressure in Bar.
Yes. The built-in Batch Pressure Converter lets you convert multiple values simultaneously with configurable decimal precision.
Gauge pressure measures pressure relative to atmospheric pressure, whereas absolute pressure is measured relative to a perfect vacuum.
Yes. This calculator uses internationally accepted pressure conversion factors and allows high decimal precision for engineering and scientific calculations.

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