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Home » Math & Conversions » Unit Conversions » Atmospheres to PSI Converter Atmospheres to PSI (atm to psi) Converter A complete pressure unit conversion tool. Enter a value in any field to instantly convert between **Atmospheres (atm)**, **PSI**, **Bar**, **Kilopascals (kPa)**, and **Torr (mmHg)**. Atmospheres (atm) Pounds per Square Inch (PSI) Bar Kilopascals (kPa) Torr (mmHg) Value in Pascals (Pa) - The Difference: atm vs. bar vs. Pascal The main source of confusion when converting pressure is the similarity between "atm" and "bar". They are close in value but are not the same. Pascal (Pa): This is the base SI unit for pressure. It's very small (1 N/m²), so we almost always use **Kilopascals (kPa)** (1,000 Pa) or **Megapascals (MPa)** (1,000,000 Pa). Bar: A simple metric unit. 1 bar = 100,000 Pa exactly. This is very close to atmospheric pressure. Standard Atmosphere (atm): This is an older unit, defined as the *average* atmospheric pressure at sea level. 1 atm = 101,325 Pa exactly (or 1.01325 bar). PSI (Pounds per Square Inch): The Imperial unit, common in the US, defined by force (pounds) over area (square inches). Torr (mmHg): A unit based on the pressure exerted by one millimeter of mercury, commonly used in meteorology and for vacuum pressures. 1 atm = 760 Torr . Conversion Formulas All conversions are based on the Pascal (Pa): 1 atm = 101,325 Pa 1 PSI = 6,894.757 Pa 1 bar = 100,000 Pa 1 kPa = 1,000 Pa 1 Torr = 133.322 Pa From this, we can find the direct formula: PSI = atm × 14.6959... atm = PSI × 0.068046... Common Pressure Conversion Table Measurement atm PSI kPa Bar Absolute Vacuum 0 0 0 0 Standard Atmosphere 1 atm 14.696 psi 101.325 kPa 1.013 bar Car Tire Pressure ~2.2 atm ~32 psi ~220 kPa ~2.2 bar Home Water Pressure ~3.4 atm ~50 psi ~345 kPa ~3.4 bar Frequently Asked Questions (FAQ) What is the formula for atm to PSI? The exact formula is: PSI = atm × 14.6959487755 . For most calculations, multiplying by 14.696 is sufficient. How many PSI are in 1 atm? There are **14.696 PSI** (Pounds per Square Inch) in 1 standard atmosphere (atm). Is 1 bar the same as 1 atm? No. They are very close, but 1 standard atmosphere (atm) is slightly larger than 1 bar. 1 atm = 1.01325 bar . Related Calculators Millimeters to Inches Converter Typography Unit Converter (px, pt, em, rem, %) Kilograms to Pounds Converter Centimeters to Inches Converter BTU to kWh Converter Angstroms to Nanometers Converter Kelvin to Fahrenheit Converter Degrees to Radians Converter Cups to Tablespoons Converter Barrels to Gallons Converter
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Atm To Psi Calculator
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