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Bar To Torr Converter

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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 bar = 750.06168270417 torr
1 torr = 0.00133322368421053 bar

(Exact factors: 750.06168270417 and 0.00133322368421053)

Sources: NIST · BIPM

About This Bar And Torr Converter

This quick tool helps you work with bar and torr. See your result in torr with a clean, simple interface. A swap button lets you switch between units. It's fast, clear, and ready whenever you need it.

What Are Bars And Torrs?

What Is A Bar?

Bar is a unit of pressure equal to 100,000 pascals (Pa). It is defined as 1 bar = 100 kPa = 100,000 N/m². It belongs to the metric system and is a non-SI unit accepted with SI. Symbol: bar. Real-world example: a typical car tire pressure is about 2–3 bar.

What Is A Torr?

A Torr is a unit of pressure defined as 1 millimeter of mercury (mmHg) at 0 degrees Celsius. It equals 1/760 of standard atmospheric pressure, roughly 133.3 pascals. It is a non-SI unit used in vacuum work and meteorology. Symbol: Torr (mmHg is also used for the same pressure). Real-world example: standard atmospheric pressure at sea level is about 760 Torr; 1 Torr is about 0.133 kPa (~0.02 psi).

When To Use Bar Vs Torr

Bar Usage

Bar is commonly used as a unit of pressure in weather reports and consumer gauges in many European countries. It remains a familiar reference for tire pressures and everyday measurements. Primary users include Germany, France, Italy, and Spain.

Torr Usage

Torr is used as a non-SI unit of pressure in scientific and medical contexts in several countries, including the United States, the United Kingdom, Germany, and Japan.

How To Convert Between Bars And Torrs

Conversion Formulas

Bar to Torr:
bar × 750.06168270417 = torr

Torr to Bar:
torr × 0.00133322368421053 = bar

Step-by-Step Guide

Bar to Torr

  1. Take your value in bars.
  2. Multiply by 750.06168270417.
  3. The result is in torrs.

Torr to Bar

  1. Take your value in torrs.
  2. Multiply by 0.00133322368421053.
  3. The result is in bars.

Example: Convert 2 bars to torrs.

  • Exact: 2 × 750.06168270417 = 1500.12336540834 torrs.
  • Rounded: approximately 1500.12 torrs.

Example: Convert 5 torrs to bars.

  • Exact: 5 × 0.00133322368421053 = 0.00666611842105263 bars.
  • Rounded: approximately 0.00666612 bars.

History & Context

Bar is a historical unit of pressure tied to the rise of metric measurements in Europe. It was proposed to give engineers a practical way to express pressure in laboratories and factories, and it spread through science and industry as standards grew. Torr is named after Evangelista Torricelli, the scientist who built a mercury barometer and showed that air has weight. The torr entered scientific use to express small pressures in vacuum work, carrying the link to atmospheric pressure and the idea of a standard reference, though neither unit is part of the official SI system.

Practical Use

In a laboratory setting, technicians might need to convert bar to torr to compare a reactor's pressure reading (given in bar) with the vacuum chamber gauge that uses torr. This helps ensure consistent safety margins when managing processes under low-pressure conditions. Conversely, when setting up or validating a vacuum system, engineers may convert torr to bar to confirm equipment tolerances are met in metric units.

Common Mistakes When Converting Between Bars And Torrs

  • Treating bar and torr as identical units.
  • Using the same numerical value for both directions of conversion.
  • Not checking which unit is needed after performing the conversion.
  • Relying on an out-of-date or incorrect method instead of verifying the current bar and torr relationship.

Mental Shortcuts For Quick Conversions

Bar → Torr: multiply by 750 (1 bar ≈ 750 Torr). Torr → Bar: divide by 750 (1 Torr ≈ 1/750 bar). For estimation only; use a precise converter in most situations.

Bars And Torrs Conversion Graph

Bars and Torrs Conversion Graph
Conversion graph showing the relationship between bars and torrs.

Conversion Table For Bar And Torr

Common conversion values
Bars Torrs
1750.062
21500.12
53750.31
107500.62
2518751.5
5037503.1
10075006.2
200150012
500375031

Values are rounded for display; internal calculations use the exact conversion factors between bar and torr (750.06168270417 and 0.00133322368421053).

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/bar-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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