Pressure converter
Convert between pascals (Pa), kilopascals (kPa), bar, pounds per square inch (psi), standard atmospheres (atm), and millimeters of mercury (mmHg). Check car tire specs (32 psi ≈ 220 kPa), barometric pressure, or lab gauge readings across unit systems.
Value
From
Pa
kPa
bar
atm
psi
mmHg
To
Pa
kPa
bar
atm
psi
mmHg
Result
14.5 psi
How to convert pressure units
1. Enter pressure in the source unit.
2. Select target unit (psi, bar, kPa, etc.).
3. Note absolute vs gauge pressure — converters assume absolute values unless labeled.
4. Apply manufacturer rounding for tire placard limits.
Pressure conversion examples
Car tires
32 psi ≈ 220.6 kPa ≈ 2.21 bar. Door placard is authoritative for your vehicle.
Standard atmosphere
1 atm = 101,325 Pa = 14.696 psi = 760 mmHg — sea-level reference.
Bike tires
80 psi (road bike) = 551.6 kPa. MTB may use 25 psi = 172 kPa.
When to use the pressure converter
• When you inflate tires using a pump with different unit display than the placard.
• When you compare weather maps in inHg vs hPa (mb).
• When you read industrial specs in bar vs psi.
When to choose something else
• When you need force (newtons) — pressure × area, separate calculation.
• When you need vacuum vs absolute without reference — clarify gauge zero.
• When altitude affects atmospheric pressure — use barometric formulas for precision.
Tire pressure safety
Under-inflation wears edges and hurts fuel economy; over-inflation reduces grip. Convert units correctly before comparing to placard — a mix-up between bar and psi can be 14× error if you treat numbers as identical.
Weather and aviation units
US aviation uses inches of mercury (inHg); METAR in hPa elsewhere. 29.92 inHg ≈ 1013 hPa standard altimeter setting. Pilots cross-check converted values when flying internationally.
Frequently asked questions
What is psi?
Pounds force per square inch. Common for US automotive and hydraulics.
What is bar?
1 bar ≈ 100 kPa ≈ 14.5 psi. Close to 1 atm for rough work.
mmHg for blood pressure?
120/80 mmHg systolic/diastolic — medical cuff units, not tire pressure.
Gauge vs absolute?
Gauge reads relative to ambient air (0 gauge ≈ 1 atm absolute). Tire gauges are typically gauge pressure.
Pascal definition?
1 Pa = 1 N/m². Kilopascal kPa = 1000 Pa.
Is data uploaded?
No. Conversions run locally.