Convert Torr to PSI
Convert Torr to PSI instantly. 1 Torr (Torr) equals 0.01934 PSI (psi).
Torr to PSI conversion table
| Torr (Torr) | PSI (psi) |
|---|---|
| 1 Torr | 0.01934 psi |
| 2 Torr | 0.03867 psi |
| 3 Torr | 0.05801 psi |
| 5 Torr | 0.09668 psi |
| 10 Torr | 0.1934 psi |
| 20 Torr | 0.3867 psi |
| 50 Torr | 0.9668 psi |
| 100 Torr | 1.9337 psi |
| 500 Torr | 9.6684 psi |
| 1,000 Torr | 19.3368 psi |
1 Torr = 0.01934 PSI · multiply Torr by 0.01934
About converting Torr to PSI
Torr (Torr) and PSI (psi) are both units of pressure, so converting between them is a single multiplication: multiply your Torr figure by 0.01934. Ten Torr comes to 0.1934 PSI, and a hundred works out at 1.9337 PSI.
Rule of thumb: going from Torr to PSI divides, so the figure always shrinks — it takes about 51.7149 Torr to make a single PSI. If your answer came out bigger, you have the conversion the wrong way round.
What is a Torr?
The torr is named after Evangelista Torricelli, who invented the mercury barometer and in the process produced the first sustained vacuum anyone had made. The unit fits that legacy exactly: it is very nearly the pressure of one millimetre of mercury, and it is still the working unit of vacuum technology, where gauges read in torr and in decimal fractions of it. Its most familiar relative is not in a laboratory at all — blood pressure is quoted in millimetres of mercury, essentially the same size, so a reading of 120 over 80 is a pressure measurement in all but name.
What is a PSI?
Pounds per square inch is the pressure unit Americans actually meet: on the gauge at the filling-station air pump, on compressors, on hydraulic equipment, and on the sidewall of every tyre sold in the country. It survives in British tyre pressures too, despite nearly everything else there having gone metric. Structurally it is exactly what the name says — a pound-force resting on a square inch — and that heritage is also its weakness, because it inherits the pound-force and with it the old confusion between pounds as weight and pounds as mass.
To put both in perspective: a rough vacuum pump pulls down to about 0.1 torr, while a car tyre is usually inflated to about 32 psi.
The converter above updates as you type, and the table lists common values for quick reference. Need the opposite direction? Use the PSI to Torr converter, or browse all Pressure converters.
Frequently asked questions
How many PSI are in one Torr?
There are 0.01934 PSI in one Torr.
How do I convert Torr to PSI?
Multiply the number of Torr by 0.01934. For example, 10 Torr = 0.1934 PSI.
What is 100 Torr in PSI?
100 Torr is equal to 1.9337 PSI.
How do I convert PSI to Torr?
Multiply the PSI value by 51.7149 (or divide by 0.01934).
Is this Torr to PSI conversion exact?
The definition is exact — Torr and PSI are both fixed against the same base by international agreement — but the decimal shown here is rounded for readability, because the true ratio does not terminate. For engineering or scientific work, carry more decimal places than this page displays.
What is a Torr?
The torr is named after Evangelista Torricelli, who invented the mercury barometer and in the process produced the first sustained vacuum anyone had made. The unit fits that legacy exactly: it is very nearly the pressure of one millimetre of mercury, and it is still the working unit of vacuum technology, where gauges read in torr and in decimal fractions of it. Its most familiar relative is not in a laboratory at all — blood pressure is quoted in millimetres of mercury, essentially the same size, so a reading of 120 over 80 is a pressure measurement in all but name.
What is a PSI?
Pounds per square inch is the pressure unit Americans actually meet: on the gauge at the filling-station air pump, on compressors, on hydraulic equipment, and on the sidewall of every tyre sold in the country. It survives in British tyre pressures too, despite nearly everything else there having gone metric. Structurally it is exactly what the name says — a pound-force resting on a square inch — and that heritage is also its weakness, because it inherits the pound-force and with it the old confusion between pounds as weight and pounds as mass.