Pressure Converter
Enter a pressure in any unit to see it in all six, from pascals and bar to psi, atmospheres and mercury readings.
Ce contenu est en anglais.
Exemples détaillés
Bar into psi for car tyres
1 bar
About 14.5038 psi.
Car tyre pressures are often quoted in psi, so this conversion helps when a figure is given in bar.
One atmosphere into psi
1 atmosphere
About 14.6959 psi.
One atmosphere is 101.325 kilopascals, which is a little more than one bar.
À propos de Pressure Converter
Pressure is measured in several units that look unrelated at first. The pascal is the official SI unit, bar is common in weather reports and engineering, psi appears on tyre gauges and in many American specifications, and atmospheres give a simple sense of air pressure at sea level. Mercury units such as mmHg and inHg are still used for medical readings and barometers. This pressure converter takes a value in any of the six units and shows it in all of them, so a figure from a gauge, a manual or a forecast can be read directly.
Each row is worked out from exact factors, so one bar equals 100,000 pascals and one atmosphere equals 101,325 pascals. The mercury units assume the mercury is at 0 °C, which is the standard convention for these scales. Results show about six significant figures, which is more than enough for most practical uses. Pressure readings change with altitude and weather, so the converter shows the same value in different units rather than a live reading of the air around you.
Comment utiliser Pressure Converter
- Type the pressure into the pressure box and choose the unit it is written in.
- Read the table to see the same pressure in all six units at once.
- Use the bar or psi row to compare a tyre gauge with the figure in your car handbook.
- Use the mmHg or inHg row when a weather or medical reading uses mercury units.
- Copy the result if you want to keep the figures for a report or a manual.
Usages courants
- Setting car tyres with a pump that shows bar when the handbook gives psi
- Comparing a weather forecast in hPa or bar with a barometer reading in inHg
- Converting a pressure from a manual written in pascals into psi
- Checking how an atmosphere figure in a science lesson compares with bar
Questions fréquentes
How many psi is one bar?
One bar is about 14.5 psi, which is close to the pressure of the air at sea level. Because bar and psi are both common, the figure is worth remembering for car tyres and pumps. The exact value is 14.5038 psi, so the converter gives that figure to four decimal places. For most pumps, rounding to 14.5 is accurate enough for everyday use.
Is an atmosphere the same as a bar?
They are very close but not identical. One standard atmosphere is 101,325 pascals, which is 1.01325 bar. The difference is small, so the two units are often used as if they were the same in weather and engineering. For precise work, use the exact value from the table to avoid any error from rounding.
What is mmHg?
mmHg means millimetres of mercury, a unit based on the height a column of mercury rises in a tube under a given pressure. One standard atmosphere is 760 mmHg, which is why readings near that figure are described as normal air pressure at sea level. The unit is still used for blood pressure and some weather equipment, where it remains the customary scale.
Why do tyres use psi or bar?
Tyre pressures are usually set in psi or bar because these units suit the pressures that tyres need. Most car tyres run between about 30 and 36 psi, which is roughly 2 to 2.5 bar. The correct figure is printed on a sticker in the car, often inside the driver's door frame, and the converter helps if your pump uses the other unit.
How do pascals compare with everyday pressures?
One pascal is a very small pressure, equal to one newton of force spread over one square metre. Typical air pressure at sea level is about 101,325 pascals, which is why larger figures are often written in kilopascals or bar. Pascals are used across science and engineering, where small pressures are easier to write as whole numbers than as long decimals.