💨

Pressure Converter

PSI • bar • kPa • atm • mmHg

Pressure Value ⓘ

From

💨

Enter a pressure to convert

How to Use the Pressure Converter

Enter a pressure — e.g. 32 for 32 PSI (common tire pressure), or 1 for 1 atm (atmospheric pressure).
Select From unit — PSI (US tires/hydraulics), bar (European tires), kPa (weather/SI), atm (science), mmHg (blood pressure).
All five pressure units shown at once — PSI, bar, kPa, atm, and mmHg all displayed simultaneously.
Tire pressure tip — recommended tire pressure is usually 32–35 PSI = 2.2–2.4 bar. Check your car's door jamb sticker for the exact value.

Benefits

🚗

Tire Pressure

Convert PSI to bar for European cars and tire pressure gauges that show bar instead of PSI.

🩺

Blood Pressure

Blood pressure is measured in mmHg worldwide. Understand what those numbers mean in other units.

🌦️

Weather & Altitude

Convert barometric pressure readings between kPa, inHg, and atm for weather and aviation.

Pressure Conversion Guide — PSI, Bar, kPa & More

Pressure conversion is needed in three main everyday contexts: tire pressure (PSI in the US, bar in Europe), blood pressure (universally in mmHg), and weather/barometric pressure (inHg in the US, hPa/mbar internationally). The standard atmospheric pressure at sea level is 14.6959 PSI = 1.01325 bar = 101.325 kPa = 1 atm = 760 mmHg = 29.9213 inHg.

Tire pressure: Most passenger cars run at 32–35 PSI = 2.2–2.4 bar. SUVs and trucks: 35–40 PSI = 2.4–2.8 bar. Low tire pressure (under 25 PSI = 1.72 bar) reduces fuel economy, handling, and tire life. Always check tire pressure when cold (driven less than 1 mile). Tires naturally lose 1–2 PSI per month and 1 PSI per 10°F temperature drop.

🚗

Tire Pressure Guide

Passenger car: 32–35 PSI = 2.2–2.4 bar. Truck/SUV: 35–40 PSI = 2.4–2.8 bar. Bicycle road: 80–130 PSI = 5.5–9 bar. Mountain bike: 22–35 PSI = 1.5–2.4 bar. Basketball: 7.5–8.5 PSI = 0.52–0.59 bar.

🩺

Blood Pressure

Normal: 120/80 mmHg. Elevated: 120–129/80 mmHg. High stage 1: 130–139/80–89 mmHg. High stage 2: 140+/90+ mmHg. Crisis: 180+/120+ mmHg. All BP is in mmHg worldwide.

🌡️

Weather Barometric

Normal: 29.92 inHg = 1013 hPa = 101.3 kPa. High pressure: above 30.2 inHg = 1023 hPa. Low pressure: below 29.6 inHg = 1002 hPa. Storms: below 980 hPa.

🏔️

Altitude & Pressure

Sea level: 101.3 kPa = 14.7 PSI. Denver (5,280 ft): 84 kPa = 12.2 PSI. Mt Everest summit: 33.7 kPa = 4.89 PSI. International Space Station cabin: 101 kPa (same as sea level).

Pressure Conversion FAQ

How do you convert PSI to bar? ▾

1 PSI = 0.0689476 bar. To convert PSI to bar: multiply by 0.0689476. Quick mental math: divide PSI by 14.5 for a close estimate. Common tire pressure conversions: 30 PSI = 2.07 bar. 32 PSI = 2.21 bar. 35 PSI = 2.41 bar. 40 PSI = 2.76 bar. 50 PSI = 3.45 bar. Reverse: 1 bar = 14.5038 PSI.

What is normal tire pressure in bar vs PSI? ▾

Most passenger cars: 32–35 PSI = 2.2–2.4 bar. SUVs/trucks: 35–40 PSI = 2.4–2.8 bar. Your exact recommended pressure is on a sticker inside the driver's door jamb or in the owner's manual — not on the tire sidewall (that shows maximum pressure, not recommended). Always check when cold. Underinflated tires reduce MPG by 0.2% per PSI under recommended pressure and increase blowout risk.

How many PSI is 1 atmosphere? ▾

1 standard atmosphere (atm) = 14.6959 PSI = 1.01325 bar = 101,325 Pa = 101.325 kPa = 760 mmHg = 29.9213 inHg. Standard atmospheric pressure is the average air pressure at sea level. It decreases with altitude: at 5,000 ft = 12.23 PSI. At 10,000 ft = 10.1 PSI. At 30,000 ft (aircraft cruising altitude) = 4.36 PSI (cabin is pressurized to about 10.9 PSI = 75 kPa).

What is blood pressure in mmHg and why that unit? ▾

Blood pressure is always measured in millimeters of mercury (mmHg) because the original sphygmomanometers (blood pressure cuffs) literally used a column of mercury to measure pressure. A normal blood pressure of 120/80 mmHg means the systolic pressure (heart pumping) is 120 mmHg and diastolic (resting) is 80 mmHg. In SI units: 120 mmHg = 16,000 Pa = 16 kPa = 2.32 PSI — far too low-sounding for clinical use, which is why mmHg stuck.