Torr Converter

What the Torr Converter does

Torr Converter: 1 Torr = 0.13332237 kPa, so multiply a torr value by 0.13332237 to get kilopascal, or divide to go back. Example: 1 Torr = 0.13332237 kPa.

Enter Value, From and To and the Torr Converter reports Result, How it was calculated and Reverse conversion. You can nudge a single number and watch the effect straight away.

Most people who open the Torr Converter are anyone working across two measurement systems. Having the exact factor matters more than a rough mental estimate.

There is no account, no upload and no server round trip, because the page does the work itself.

The meaning of each field, the formula in use, and a worked example that starts from the default inputs are all further down.

What do the Torr Converter fields mean?

The Torr Converter uses 3 inputs. You do not have to fill everything in before seeing an answer; the starting values already produce one.

How does the Torr Converter work?

Both units are converted through pressure's base unit (Pa), so any of the 12 units in the dropdowns can be paired in either direction without loss of accuracy.

Definitions are taken from the SI system where one exists, and from CODATA or the IAU where a unit is established by measurement. No factor is rounded before the calculation.

Worked example

These are the values the Torr Converter loads by default, and the result it produces from them. This is the worked example the page starts from, reproduced here so you can check the arithmetic.

The torr

The torr is defined as exactly 1/760 of a standard atmosphere (about 133.322 Pa), named after Evangelista Torricelli, the 17th-century Italian physicist who invented the mercury barometer and, with it, the whole concept of measuring atmospheric pressure.

Worth knowing

• The torr is very close to, but not mathematically identical to, the millimetre of mercury (mmHg): the two differ by less than 0.000015%, a gap so small it’s negligible for virtually any practical purpose, but they are technically defined by slightly different conventions.
• It’s the standard unit in vacuum science and chemistry, where pressures far below atmospheric are common. A "high vacuum" might be quoted in the range of 10⁻³ to 10⁻⁷ torr, values that would be awkwardly small numbers of pascals.
• The 1/760 definition comes directly from Torricelli’s original observation that a column of mercury 760 mm tall balances standard atmospheric pressure: a genuinely elegant historical origin for a still-used scientific unit.

Definitions: BIPM SI Brochure · NIST reference on units

How to use it

1. Enter Value.
2. Pick a value for From: the options are Pascal (Pa), Hectopascal (hPa), Kilopascal (kPa), Megapascal (MPa), Bar (bar) or Millibar (mbar).
3. Pick a value for To: the options are Pascal (Pa), Hectopascal (hPa), Kilopascal (kPa), Megapascal (MPa), Bar (bar) or Millibar (mbar).
4. Each keystroke triggers a fresh calculation, which is cheap because it happens locally.
5. You get Result, How it was calculated and Reverse conversion back.
6. Copy Link puts the current inputs in the URL, so bookmarking it brings the same numbers back.

What this tool does not do

• Repeated conversions compound rounding, so convert once from the original value where possible.
• Factors use the internationally agreed definitions; some industries round them differently.
• It assumes the values you give are already consistent with each other.
• It validates ranges, not intent. A value can be accepted and still be the wrong one to use.

Frequently asked questions

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