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Pascal To Torr Converter

Pa

Review And Reference Information

Verified by the ConvertReference Technical Standards Team

ConvertReference Technical Standards Team

All values and formulas are validated through our editorial review process and cross-checked against internationally recognized reference standards (NIST, BIPM, CODATA).

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Last reviewed: December 08, 2025

Conversion Factors

1 pascal = 0.0075006168270417 torr
1 torr = 133.322368421053 pascal

(Exact factors: 0.0075006168270417 and 133.322368421053)

Sources: NIST · BIPM

About This Pascal And Torr Converter

Welcome to the pascal to torr tool, your quick reference for pressure units. View results in torr while you work with pascal. Use the swap button to switch between units. Fast, simple, and ready for everyday use.

What Are Pascals And Torrs?

What Is A Pascal?

Pascal (Pa) is the SI unit of pressure defined as one newton per square meter (1 Pa = 1 N/m^2 = 1 kg/(m*s^2)). It belongs to the International System of Units (SI). Example: atmospheric pressure at sea level is about 101,325 Pa.

What Is A Torr?

Torr is a unit of pressure. It equals 1/760 of an atmosphere, i.e., 1 torr = 133.322 Pa exactly (since 1 atm = 101325 Pa). It is a non-SI unit still used in vacuum and physics. Abbreviation: torr (symbol: torr). Real‑world example: a laboratory vacuum might read about 0.1 torr.

When To Use Pascal Vs Torr

Pascal Usage

Pascal (Pa) is the SI unit of pressure. It is used in science, education, and medicine, and appears in regulatory and reporting contexts in many countries. Primary users include the United States, United Kingdom, Germany, and Japan.

Torr Usage

Torr is a pressure unit used in medical and scientific contexts, where 1 torr equals 1 mmHg. It is used in several countries, including the United States, the United Kingdom, Germany, and Japan.

How To Convert Between Pascals And Torrs

Conversion Formulas

Pascal to Torr:
pascal × 0.0075006168270417 = torr

Torr to Pascal:
torr × 133.322368421053 = pascal

Step-by-Step Guide

Pascal to Torr

  1. Take your value in pascals.
  2. Multiply by 0.0075006168270417.
  3. The result is in torrs.

Torr to Pascal

  1. Take your value in torrs.
  2. Multiply by 133.322368421053.
  3. The result is in pascals.

Example: Convert 2 pascals to torrs.

  • Exact: 2 × 0.0075006168270417 = 0.0150012336540834 torrs.
  • Rounded: approximately 0.0150012 torrs.

Example: Convert 5 torrs to pascals.

  • Exact: 5 × 133.322368421053 = 666.611842105263 pascals.
  • Rounded: approximately 666.612 pascals.

History & Context

Blaise Pascal was a French scientist whose work showed how air pressure acts and how a vacuum can exist. He and colleagues did experiments with barometers and water to study how pressure changes with height and weather. The unit named after Pascal became a major measure of pressure in the modern system. Evangelista Torricelli, an Italian inventor, built the mercury barometer and showed that air has weight that can push on a mercury column. The unit named for him, the torr, came from his discovery and from the use of mercury in pressure tests. These names connect early ideas about air, vacuum, and the invisible forces that push on liquids and gases.

Practical Use

Researchers often measure gas pressure with sensors that output in pascals, but when matching specifications or communicating with older equipment, they need to convert pascal to torr. Conversely, technicians calibrating a vacuum chamber or pump curves frequently report pressure in torr and then convert those values to pascals for compatibility with other instruments. These conversions help ensure consistent readings across devices and documentation, whether reporting to standard vacuum benchmarks or comparing data from different measurement systems.

Common Mistakes When Converting Between Pascals And Torrs

  • Treating pascal and torr as identical units.
  • Assuming the numerical value is the same in both units.
  • Converting in the wrong direction by applying the wrong relationship between the units.
  • Confusing torr with another pressure unit without verifying the relation.

Mental Shortcuts For Quick Conversions

Pa to Torr: divide by about 133 to estimate Torr. Torr to Pa: multiply by about 133 to estimate Pa. This is for estimation only; use a precise converter in most situations.

Pascals And Torrs Conversion Graph

Pascals and Torrs Conversion Graph
Conversion graph showing the relationship between pascals and torrs.

Conversion Table For Pascal And Torr

Common conversion values
Pascals Torrs
10.00750062
20.0150012
50.0375031
100.0750062
250.187515
500.375031
1000.750062
2001.50012
5003.75031
10007.50062

Values are rounded for display; internal calculations use the exact conversion factors between pascal and torr (0.0075006168270417 and 133.322368421053).

Dataset & API Access

Programmatic Access

Free JSON API with stable endpoints and predictable keys for automated bidirectional conversions.

Endpoint: https://convertreference.org/api/v1/convert/pascal-to-torr.json

Content Type: application/json

Documentation: View API docs

Licensing

License: CC0 1.0 Universal (Public Domain)

See all datasets

Data & Editorial Process

All numerical values and formulas are generated from the Pint scientific unit library (v0.25), using constants consistent with the BIPM SI Brochure (9th Edition) and NIST Special Publication 811. Explanatory text is drafted with AI assistance and reviewed by ConvertReference editors for clarity and accuracy. This converter is completely free to use, and all calculations are performed locally in your browser and never sent to a server.

  • 2025-12-08 – Generated: Page created using Pint v0.25 verified constants.
  • 2025-12-08 – Reviewed: Verified by ConvertReference editors; no numerical changes required.
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