Skip to main content

Torr to Bar Converter
↔ Convert bar to torr instead

Common Conversions

torr bar
1 0.001333
10 0.01333
50 0.06666
100 0.13332
200 0.26664
400 0.53329
500 0.66661
600 0.79993
750.062 1
760 1.01325
1000 1.33322

Why this conversion matters in chemistry

Sublimation apparatus and vapor-pressure tables stay in torr by long convention; modern safety documentation and IUPAC-aligned thermodynamic references run in bar. The constant of 0.001333224 bar per torr falls out of 760 torr per atmosphere and 1.01325 bar per atmosphere. A sublimation run held at 0.5 torr is 6.66 × 10⁻⁴ bar — the value a vacuum-system spec sheet might list once a group has standardized on SI-derived units. Multiplying is decimal arithmetic but the conversion is the bookkeeping at the boundary between mercury-column tradition and modern reporting.

Formula

bar = torr × 0.001333224

Worked Examples

760 torr = 1.01325 bar

Standard atmospheric pressure expressed in bar — the calibration anchor in both unit systems.

750.062 torr = 1 bar

Exactly 1 bar in torr — the IUPAC reference pressure for tabulated standard-state values.

1 torr = 0.001333 bar

The factor itself — useful as a quick mental check on a vacuum-gauge reading.

23.8 torr = 0.03173 bar

The vapor pressure of water at 25 °C — the value behind any gas collected over water calculation done in bar.

Frequently Asked Questions

How do I convert torr to bar?
Multiply by 0.001333224. So 760 torr becomes 1.01325 bar — one standard atmosphere expressed in IUPAC-aligned units.
Why convert from torr to bar?
IUPAC adopted 1 bar (100 kPa) as the standard state pressure for tabulated thermodynamic data in 1982. Vapor-pressure values still appear in torr in many references, so the conversion is the routine step that brings legacy data into the modern reporting framework.
How many torr make exactly 1 bar?
750.062 torr — about 10 torr less than the 760 torr of one standard atmosphere. The 1.3% gap between bar and atm shows up here.
What's the significance of the bar in modern chemistry?
Since 1982 IUPAC has used 1 bar as the standard pressure for tabulating standard Gibbs energies, formation enthalpies, and other reference values. Anything anchored to those tables implicitly references the bar.