Torr to atm Conversion

Convert torr (mmHg) to atmospheres instantly — one atmosphere is exactly 760 torr — with a full equivalents table and a comparison chart.

Result

1 atm

Equivalent pressure

Your value in torr, atmospheres, and PSI.

How it works

The atmosphere and the torr are both pressure units defined relative to mercury columns. One standard atmosphere is defined as exactly 760 torr, so the conversion is a simple division.

atm = torr ÷ 760
torr = atm × 760

Worked example

A vacuum reading of 380 torr equals 380 ÷ 760 = 0.5 atm, i.e. half an atmosphere.

Frequently asked questions

How do I convert torr to atm?

Divide by 760 — for example, 380 torr = 0.5 atm.

Is torr the same as mmHg?

Effectively yes; they are used interchangeably and differ by well under 0.1%.