A standard atmosphere is exactly 101,325 pascals.
Atmospheres to Torrs Converter — atm to Torr
Convert Atmosphere (atm) to Torr (Torr) using the exact conversion factor (1 atmosphere = 760 torr). See the formula, worked examples, conversion table, and common uses.
Atmospheres to Torrs converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
A torr is 1/760 standard atmosphere.
Result = input x 101325 / 133.3223684.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Atmospheres to Torrs
Atmosphere and Torr both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Atmosphere is most often used for chemistry (standard conditions are often defined at 1 atm).
Formula
torrs = atmospheres × 760
This factor comes from each unit's defined relationship to the category's base unit: 1 atmosphere equals 101325 base units, and 1 torr equals 133.322368421 base units, so dividing one by the other gives the direct atmosphere-to-torr factor of 760.
Simple example
1 atm × 760 = 760 Torr
1 atmosphere = 760 torrs.
Real-world example
100 atm × 760 = 76,000 Torr
100 atmospheres = 76,000 torrs.
Conversion table
| Atmosphere (atm) | Torr (Torr) |
|---|---|
| 1 atm | 760 Torr |
| 10 atm | 7,600 Torr |
| 50 atm | 38,000 Torr |
| 100 atm | 76,000 Torr |
| 500 atm | 380,000 Torr |
| 1,000 atm | 760,000 Torr |
Reverse conversion: Torr to Atmosphere
760 Torr × 0.001315789474 = 1 atm
760 torrs = 1 atmospheres.
atmospheres = torrs × 0.00131578947368
For a page dedicated to this direction, see Torr to Atmosphere.
Understanding the Atmosphere
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
Where it's used: Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar
Uses of the Atmosphere today
- Chemistry (standard conditions are often defined at 1 atm)
- Diving and aviation pressure references
- General reference for everyday atmospheric pressure
Understanding the Torr (Torr)
A torr is 1/760 standard atmosphere.
Atmosphere — sources
- BIPM SI Brochure — Standard atmosphere listed among non-SI units with a fixed exact value in pascals.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many torrs are in 1 atmosphere?
1 atmosphere equals 760 torrs, using the exact defined conversion factor rather than an estimate.
How do I convert atmosphere to torr?
Multiply the atmosphere value by 760. The converter above does this instantly to whatever precision you set.
How do I convert torr back to atmosphere?
Use the reverse factor: 1 torr equals 0.0013157895 atmospheres. You can also use the swap control in the converter above to flip the direction instantly.
What is a atmosphere?
Atmosphere (atm) measures pressure. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. It is classified as a non-SI unit accepted for use with the SI.
What is a torr?
Torr (Torr) is a unit of engineering.
Is the atmosphere to torr conversion exact?
Yes. Defined as exactly 101,325 pascals, originally based on the average atmospheric pressure at mean sea level. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the atmosphere still used today?
Widely used internationally in chemistry, meteorology, and diving/aviation contexts alongside the pascal and bar
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.