Pressure Converter
Convert between pascal, kilopascal, bar, psi, atmosphere, mmHg and more pressure units
Unit Converter
Support fast conversion of various units including length, area, volume, weight, temperature, etc.
Common Units
Common Unit Conversions
Quick reference for frequently used unit conversions
Length
| From | To | Formula | Example |
|---|---|---|---|
| Inches (in) | Centimeters (cm) | in × 2.54 | 1 in = 2.54 cm |
| Feet (ft) | Meters (m) | ft × 0.3048 | 1 ft = 0.3048 m |
| Miles (mi) | Kilometers (km) | mi × 1.609 | 1 mi = 1.609 km |
| Meters (m) | Feet (ft) | m × 3.281 | 1 m = 3.281 ft |
| Kilometers (km) | Miles (mi) | km × 0.621 | 1 km = 0.621 mi |
Weight / Mass
| From | To | Formula | Example |
|---|---|---|---|
| Ounces (oz) | Grams (g) | oz × 28.35 | 1 oz = 28.35 g |
| Pounds (lb) | Kilograms (kg) | lb × 0.454 | 1 lb = 0.454 kg |
| Kilograms (kg) | Pounds (lb) | kg × 2.205 | 1 kg = 2.205 lb |
| Tons (t) | Tonnes (t) | t × 0.907 | 1 t = 0.907 tonnes |
Volume
| From | To | Formula | Example |
|---|---|---|---|
| Fl oz (US) | Milliliters (ml) | fl oz × 29.574 | 1 fl oz = 29.574 ml |
| Cups (US) | Milliliters (ml) | cup × 236.588 | 1 cup = 236.588 ml |
| Pints (US) | Liters (L) | pt × 0.473 | 1 pt = 0.473 L |
| Gallons (US) | Liters (L) | gal × 3.785 | 1 gal = 3.785 L |
| Liters (L) | Gallons (US) | L × 0.264 | 1 L = 0.264 gal |
Temperature
| From | To | Formula | Example |
|---|---|---|---|
| Celsius (°C) | Fahrenheit (°F) | (°C × 9/5) + 32 | 0°C = 32°F |
| Fahrenheit (°F) | Celsius (°C) | (°F - 32) × 5/9 | 32°F = 0°C |
| Celsius (°C) | Kelvin (K) | °C + 273.15 | 0°C = 273.15 K |
| Kelvin (K) | Celsius (°C) | K - 273.15 | 273.15 K = 0°C |
Area
| From | To | Formula | Example |
|---|---|---|---|
| Sq feet (ft²) | Sq meters (m²) | ft² × 0.0929 | 1 ft² = 0.0929 m² |
| Sq meters (m²) | Sq feet (ft²) | m² × 10.764 | 1 m² = 10.764 ft² |
| Acres | Hectares (ha) | acre × 0.405 | 1 acre = 0.405 ha |
| Hectares (ha) | Acres | ha × 2.471 | 1 ha = 2.471 acres |
Speed
| From | To | Formula | Example |
|---|---|---|---|
| MPH | KM/H | mph × 1.609 | 1 mph = 1.609 km/h |
| KM/H | MPH | km/h × 0.621 | 1 km/h = 0.621 mph |
| Knots | MPH | knots × 1.151 | 1 knot = 1.151 mph |
| M/S | KM/H | m/s × 3.6 | 1 m/s = 3.6 km/h |
Note: These are commonly used conversions with approximate values rounded for practical use. For precise conversions, use the calculator tool above.
Unit Conversion Reference Table
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What is Pressure Conversion?
Pressure conversion translates a force-per-area measurement from one unit to another — psi to bar, pascals to atmospheres, and so on. It is essential in engineering, meteorology, medicine, and anywhere fluids or gases are measured.
Pressure has an unusually large number of units because different fields adopted different references. The pascal (Pa) is the SI unit (newtons per square meter). Bar is a metric unit close to one atmosphere. psi (pounds per square inch) is used in the US for tires and hydraulics. atm is based on sea-level air pressure. mmHg comes from mercury barometers and survives in medicine (blood pressure).
All of these measure the same physical quantity — they just use different scales. A converter is essential because no single unit dominates across all fields.
How to Convert Pressure Units
Pressure units have conversion rates relative to a base unit (the pascal):
result = value × (fromUnit rate) ÷ (toUnit rate)
Example — convert 2.5 bar to psi:
2.5 bar = 2.5 × 100000 ÷ 6894.757 = 36.26 psi
Key tip: The pascal is tiny, so most practical pressures are expressed in kPa or MPa. When reading specs, confirm whether “bar” means bar (100 kPa) or millibar (100 Pa) — meteorology uses millibar, engineering uses bar.
Common Pressure Conversions
| From | To | Multiply by |
|---|---|---|
| psi | bar | 0.0689 |
| bar | psi | 14.504 |
| atm | bar | 1.013 |
| atm | mmHg | 760 |
| kPa | psi | 0.145 |
Frequently Asked Questions
How do I convert psi to bar?
Multiply psi by 0.0689 to get bar. For example, 32 psi (typical car tire pressure) = 32 × 0.0689 = 2.2 bar. To go the other way, multiply bar by 14.504. Tire pressure gauges in Europe usually show bar, while US gauges show psi.
What is the difference between atm and bar?
One standard atmosphere (atm) is 101,325 pascals, defined as the average air pressure at sea level. One bar is 100,000 pascals — a round metric unit. They are very close (1 atm = 1.01325 bar), so for rough estimates they can be treated as equal, but for precise work the 1.3% difference matters.
How many pascals are in a kilopascal?
There are 1,000 pascals in one kilopascal (kPa). The pascal is the SI unit of pressure, but it is very small — car tire pressure of 32 psi is about 220,000 pascals. This is why kilopascals and megapascals are more commonly used in engineering.
What is mmHg and why is it used?
mmHg (millimeters of mercury) is a pressure unit based on the height of a mercury column in a barometer — it equals 133.322 pascals. It is still used in medicine for blood pressure (e.g., 120/80 mmHg) and in aviation for altitude. Standard sea-level pressure is 760 mmHg, which equals 1 atm.
How do I convert pascals to psi?
Divide pascals by 6,894.76 to get psi. For example, 100,000 Pa = 100,000 ÷ 6894.76 = 14.5 psi. Because the pascal is so small, converting large pascal values to psi often gives more manageable numbers. One psi equals 6,894.76 pascals.