🔵 Pressure Conversion Calculator 2026
Convert between psi, bar, pascal, atmospheres, mmHg, and more
1 bar = 14.504 psi
Formula: value × 14.504
📊 All Conversions
Common Pressure Conversions
| From | To | Multiply by |
|---|---|---|
| 1 bar | psi | 14.504 |
| 1 psi | bar | 0.06895 |
| 1 bar | pascal (Pa) | 100,000 |
| 1 atm | bar | 1.01325 |
| 1 atm | psi | 14.696 |
| 1 atm | mmHg (torr) | 760 |
Reference Pressures
| Reference | Pressure |
|---|---|
| 🌍 Standard atmosphere (sea level) | 101.325 kPa (14.696 psi, 1 atm) |
| 🚗 Car tire (typical) | 200-250 kPa (30-35 psi) |
| 🚴 Bicycle tire (road) | 550-830 kPa (80-120 psi) |
| 🏠 Home water pressure | 275-550 kPa (40-80 psi) |
| 🤿 Scuba tank | 20 MPa (3,000 psi) |
| 🩺 Blood pressure (systolic) | 16 kPa (120 mmHg) |
| ⛰️ Mt. Everest summit | 33.7 kPa (0.33 atm) |
| 🌊 Ocean depth (1000m) | 10.1 MPa (100 atm) |
Understanding Pressure Units
📐 Pascal (Pa)
SI unit. 1 Pa = 1 N/m². Very small — atmospheric pressure ≈ 101,325 Pa. kPa (×1000) and MPa (×10⁶) more practical.
📊 Bar
Metric unit. 1 bar = 100,000 Pa ≈ 1 atm. Common for industrial and meteorological use. Millibar (mbar) for weather.
🔧 PSI
Pounds per square inch. US/UK standard. 1 psi = 6,894.76 Pa. Used for tires, HVAC, hydraulics.
🩺 mmHg (Torr)
Millimeters of mercury. 1 atm = 760 mmHg. Medical (blood pressure), vacuum systems. Named after Torricelli.
Frequently Asked Questions
What is pressure?
Force per unit area. Pressure = Force / Area. Measured in Pa, psi,
bar, etc. Caused by molecular collisions or weight of fluid.
How do I convert psi to bar?
Divide by 14.504 or multiply by 0.06895. Example: 100 psi ×
0.06895 = 6.895 bar.
How do I convert bar to psi?
Multiply by 14.504. Example: 2 bar × 14.504 = 29.01 psi. Quick
estimate: bar × 14.5.
What is atmospheric pressure?
101.325 kPa at sea level (1 atm = 14.696 psi = 760 mmHg = 1.01325
bar). Decreases with altitude. Weather reports use mbar/hPa.
What is the difference between bar and atm?
1 atm = 1.01325 bar. Very close but not equal. Bar is round number
(100,000 Pa); atm is actual sea level pressure.
What is a pascal?
1 Pa = 1 N/m². SI unit of pressure. Named after Blaise Pascal.
Very small; kilopascal (kPa) more common for everyday use.
How do I convert kPa to psi?
Divide by 6.895 or multiply by 0.145. Example: 200 kPa × 0.145 =
29 psi.
What is mmHg (millimeter of mercury)?
Pressure from 1mm column of mercury. 1 mmHg = 133.322 Pa = 1 torr.
Standard for blood pressure (120/80 mmHg).
What tire pressure should I use?
Check door jamb sticker. Typical car: 30-35 psi (200-240 kPa).
Check when cold. Under-inflation wastes fuel; over-inflation reduces grip.
What is gauge vs absolute pressure?
Gauge = relative to atmosphere. Absolute = gauge + atmospheric. 0
psig = 14.7 psia. Vacuum = negative gauge pressure.
What is a millibar?
1 mbar = 0.001 bar = 100 Pa = 1 hPa. Used in meteorology. Standard
atmosphere = 1013.25 mbar. Weather maps show isobars in mbar.
How does altitude affect pressure?
Decreases ~12% per 1000m. Sea level: 101 kPa. Denver (1600m): 84
kPa. Everest summit: 34 kPa. This is why ears pop.
What is a torr?
1 torr ≈ 1 mmHg exactly. Named after Torricelli. 760 torr = 1 atm.
Used in vacuum technology and medicine.
What pressure is dangerous?
Depends on application. High pressure containers can explode.
Scuba: rapid pressure changes cause decompression sickness. Always follow safety ratings.
How do I measure pressure?
Instruments: Bourdon gauge (mechanical), digital transducers,
manometers (fluid column), barometers (atmospheric). Choose based on range and accuracy needed.
What is hydraulic pressure?
Pressure in enclosed fluid system. Pascal's principle: pressure
transmitted equally. Hydraulic brakes, lifts, presses use this. Often 10-40 MPa.
How accurate is this pressure converter?
Uses precise conversion factors. Results are mathematically exact.
For critical applications, verify with calibrated instruments.