Torr to Atmospheres
Convert torr to atmospheres instantly. 1 Torr = 0.0013157895 atm. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert torr to atmospheres
To convert torr to atmospheres, divide by 759.9999999997 (multiply by 0.0013157895). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
atm = Torr × 0.0013157895
Torr to Atmospheres conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Torr | Atmospheres |
|---|---|
| 1 Torr | 0.001316 atm |
| 2 Torr | 0.002632 atm |
| 3 Torr | 0.003947 atm |
| 5 Torr | 0.006579 atm |
| 10 Torr | 0.013158 atm |
| 20 Torr | 0.026316 atm |
| 25 Torr | 0.032895 atm |
| 50 Torr | 0.065789 atm |
| 100 Torr | 0.131579 atm |
| 500 Torr | 0.657895 atm |
| 1,000 Torr | 1.315789 atm |
What is a torr?
One 760th of an atmosphere, near-identical to a millimetre of mercury.
What is a atmosphere?
The standard atmosphere, defined as exactly 101,325 Pa.
The formula
atm = Torr × 0.0013157895
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Torr to Atmospheres
- Type the number of torr you want to convert.
- Read the result in atmospheres straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked atmospheres to torr page.
Torr to Atmospheres — frequently asked questions
How many atmospheres are in a torr?
One torr equals 0.0013157895 atm. atm = Torr × 0.0013157895
What is the formula to convert torr to atmospheres?
The formula is atm = Torr × 0.0013157895. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert atmospheres back to torr?
Divide instead of multiplying: one atmosphere is 759.9999999997 Torr. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this torr to atmospheres free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error