Torr to Atmosphere Converter
Convert Torr to atmospheres, Pascals, bar, PSI, and mmHg. 1 standard atmosphere = exactly 760 Torr.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
760 Torr = 1.000000 Atmosphere (atm)
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the Torr to Atmosphere Converter
The torr to atmosphere converter changes pressure between torr, atmospheres, pascals, kilopascals, bar, millibar, PSI, mmHg, cmH₂O and inHg. One standard atmosphere is exactly 760 torr (101,325 Pa). Torr and mmHg are used in vacuum work, chemistry and medicine (blood pressure), and differ by less than two parts per million.
How to use it
- 1Type the value you want to convert.
- 2Choose the unit you are converting from and the unit you want (for example torr to atm).
- 3The result updates as you type; use the swap button to reverse the direction.
- 4Copy or share the result with the buttons below it.
Worked example
750 torr ÷ 760 ≈ 0.987 atm, or about 100.0 kPa.
How it works
Torr and mmHg
1 Torr is defined to be as close to 1 mmHg as possible. They differ by only 1.7 ppm: 1 Torr = 133.3224 Pa; 1 mmHg = 133.322387 Pa. For most practical purposes they are interchangeable.
Standard atmosphere
1 atm = 760 Torr = 101,325 Pa = 14.696 PSI = 1.01325 bar (all exact per BIPM).
Common use cases
- Vacuum system and lab calculations
- Gas law problems in chemistry
- Converting barometric readings
Frequently asked questions
A:Torr is widely used in vacuum technology, meteorology (weather pressure), physiology (blood pressure in mmHg), and chemistry.
A:Exactly 760 Torr (1 standard atmosphere). Actual sea-level pressure varies between about 720 and 800 Torr.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
Related guides
Common Unit Conversion Formulas Made Simple
Length, weight, temperature, and volume conversions explained with exact factors, worked examples, and common mistakes to avoid.
Length Converter: Convert Units Accurately
Convert any length or distance unit accurately — from kilometres and metres to miles, feet, and inches — with practical conversion tables, formulas, and real-world examples.
Temperature Converter: Celsius, Fahrenheit & Kelvin
Convert Celsius, Fahrenheit, and Kelvin with exact formulas — plus tables, absolute zero, the −40 crossover, and practical examples for weather, cooking, and science.