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Pressure Converter

Convert between pascal, bar, PSI, atmosphere, mmHg, inHg, and more

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Pressure Gauge
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Atmospheric
VacuumAtmHigh
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All Conversions
Conversion Factor 1 atm = 101,325 Pa exact SI definition
Your Calculation 1 × 101,325 = 101,325 value × factor = result
Real-World Pressure Scale (Log Scale)
All Units Relative to 1 Pascal
UnitSymbolIn Pascals1 Pa =
Key Conversion Formulas
Pascal ↔ Atmosphere Pa = atm × 101,325 Standard atmosphere defined as exactly 101,325 Pa (SI base)
Pascal ↔ Bar Pa = bar × 100,000 One bar is exactly 100 kPa — used in European weather
Pascal ↔ PSI Pa = psi × 6,894.757 Pounds per square inch — US tire pressure & hydraulics
Pascal ↔ mmHg Pa = mmHg × 133.322 Millimeters of mercury (Torr) — blood pressure & vacuum
Pascal ↔ inHg Pa = inHg × 3,386.39 Inches of mercury — US aviation & weather forecasting
General Pressure Formula P = F ÷ A Pressure = Force ÷ Area — SI units: Pa = N / m²

Real-World Reference

🌬️Atmosphere1 atm = 14.7 PSI
🚗Car Tire32–35 PSI = 220–240 kPa
🩺Normal BP120 mmHg = 16 kPa
🌊10m Depth2 atm = 29.4 PSI
🏔️Everest Peak0.33 atm = 4.9 PSI
⚙️Hydraulic200 bar = 2,900 PSI

Quick Conversion Table

PSIkPaContext
1 PSI6.89 kPaLow pressure
14.7 PSI101.3 kPa1 atmosphere
30 PSI206.8 kPaBicycle tire
35 PSI241.3 kPaCar tire
65 PSI448.2 kPaRoad bike tire
100 PSI689.5 kPaPressure washer
145 PSI999.7 kPa~10 bar
3,000 PSI20,684 kPaHydraulic system

How to Use This Calculator

1

Select the Source Pressure Unit

Choose from pascals, atmospheres, psi, bar, or millimeters of mercury.

2

Enter the Pressure Value

Type the numeric pressure reading you wish to convert.

3

View the Converted Result

The equivalent pressure in your target unit is displayed instantly.

Formula & Methodology

Atmospheres to Pascals

Pa = atm × 101,325

One standard atmosphere is defined as exactly 101,325 pascals.

PSI to Bar

bar = psi × 0.0689476

Pounds per square inch converts to bar by multiplying by approximately 0.069.

mmHg to Pascals

Pa = mmHg × 133.322

Millimeters of mercury, also called torr, are used in medical blood-pressure readings.

About this calculation · Accuracy & Methodology

Key Terms

Pascal (Pa)
The SI unit of pressure; one newton per square meter.
Atmosphere (atm)
Standard atmospheric pressure at sea level, defined as 101,325 Pa.
PSI
Pounds per square inch; used for tire pressure and industrial applications in the US.
Bar
A metric unit equal to 100,000 Pa; close to one atmosphere. Common in European weather reports.
mmHg (Torr)
Millimeters of mercury; the traditional unit for blood pressure (e.g., 120/80 mmHg).

Real-World Examples

Example 1

Car Tire Pressure

32 psi

2.206 bar — typical recommended passenger-car tire pressure

Example 2

Blood Pressure Reading

120 mmHg

0.158 atm — normal systolic blood pressure

Pressure Unit Equivalents at 1 atm

UnitValue at 1 atmCommon Use
Pascal101,325Scientific research
Bar1.01325European weather forecasts
PSI14.696Tire pressure (US)
mmHg760Blood pressure readings
kPa101.325Engineering specifications

Pressure Measurement in Science and Daily Life

What Is Pressure?

Pressure is force distributed over an area. The SI unit, the pascal, is defined as one newton per square meter. While this unit is physically intuitive, practical pressures often involve large numbers—atmospheric pressure is over 101,000 Pa—so derived units like bar, atm, and kPa are widely used.

Gauge vs. Absolute Pressure

Tire gauges and most industrial instruments measure gauge pressure, which is the pressure above ambient atmospheric pressure. Absolute pressure includes the atmosphere. A tire at 32 psi gauge has an absolute pressure of about 46.7 psi. Scientific calculations typically require absolute pressure, so always clarify which reference is being used.