🌪️ Torr to Atmosphere Converter
Translate vacuum readings into standard atmosphere units used in chemistry, physics, and HVAC.
Torr and atmospheres are common in vacuum science and barometric pressure. Enter a value in torr to see the equivalent atmospheres, plus pascals, psi, and millimeters of mercury.
Accepts negative values for vacuum relative to atmosphere. 760 Torr ≈ 1 atm at sea level.
Atmospheres (atm)
1
Pascals (Pa)
101,325
PSI
14.69595
Millimeters of mercury (mmHg)
759.99989
How to Use This Calculator
Enter the pressure in torr
Use readings from vacuum gauges, barometers, or laboratory instruments.
Review the atmosphere conversion
The converter divides by 760 to obtain atm, the standard atmospheric unit.
Check additional units
Pascals, psi, and mmHg outputs ensure compatibility with international standards and instrumentation specifications.
Formula
atm = Torr ÷ 760
Derived from the definition 1 atm = 760 Torr = 101,325 Pa. Additional units convert through Pascals for consistency.
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Torr, atmospheres, and millimeters of mercury often describe vacuum levels, barometric pressure, and lab conditions. Rapid conversions between them reduce errors when switching between instrumentation, standards, or documentation formats.
Because the calculator leverages exact constants (NIST/CODATA), it is suitable for calibration records and scientific reporting.
Pair this converter with the Pressure Conversion tool for broader unit support, or the PSI to GPM calculator when translating pressure differentials into flow estimates.
Frequently Asked Questions
Is 1 Torr exactly equal to 1 mmHg?
They are nearly the same, but differ by a small factor due to standard definitions. The converter uses precise constants for each.
Can I use this for absolute and gauge pressure?
Yes. Just ensure the values you enter are referenced the same way (absolute vs gauge). Convert gauge to absolute by adding atmospheric pressure first.
Why is atmospheric pressure defined at 760 Torr?
It is based on the mean sea-level pressure equivalent to supporting a 760 mm column of mercury at 0°C in standard gravity.
What about bar or kPa?
For those units, use the Pressure Conversion calculator which offers a broader unit selection in one interface.