pascals to torr

Pascal is the SI unit of pressure, and torr is the vacuum industry's working unit — so the conversion from a metrology report to a chamber controller runs through 0.0075006168270417, the exact number of torr in one pascal. A 100,000 Pa near-atmosphere is 750 torr; a 1 Pa high-vacuum regime is 7.5 millitorr; a 0.1 Pa process pressure is 0.75 millitorr.

1 pascal = 0.007500617 torr, and 1 torr = 133.3224 pascals. One fixed factor covers the whole range: multiply pascals by 0.007500617. Worked: 100 pascals = 0.7500617 torr; 1,000 pascals = 7.500617 torr.

By EnginStack Editorial Team | Reviewed against NIST, BIPM and primary-source documentation About →
pascals
750.0616827 torr
100,000 pascals = 750.0616827 torr 100,000 torr = 13,332,236.84210526 pascals

Constants verified against NIST Special Publication 811 (Guide for the Use of the International System of Units) and the 1959 International Yard and Pound Agreement. All values are exact — none are rounded approximations.

pascals to torr

The relationship is exact because both units are anchored to the same definition — 1 atm = 101,325 Pa = 760 torr — so one pascal is exactly 760/101,325 = 0.0075006168270417 torr. The direction matters in practice: process specs written in pascals (the SI-standard way for international equipment) meet chamber controllers and gauge readouts still calibrated in torr and millitorr, and the conversion is the daily translation between the two dialects of vacuum engineering.

torr = pascals × 0.0075006168270417
1 pascal = 0.0075006168270417 torr — 760 torr ÷ 101,325 Pa
The factor is exact: 1 atm = 101,325 Pa = 760 torr.

Worked Examples

Example 1: Convert a chamber held at standard atmosphere

101,325 × 0.0075006168270 = 760 torr

Example 2: Convert a 100,000 Pa near-atmosphere

100,000 × 0.0075006168270 = 750.1 torr

Example 3: Convert a 1,000 Pa medium vacuum

1,000 × 0.0075006168270 = 7.501 torr

Common pascals to torr Conversions

pascalstorrContext
1 Pa0.0075 torrThe SI anchor.
100 Pa0.75 torrA rough vacuum.
1,000 Pa7.5 torrMedium vacuum.
100,000 Pa750 torrNear standard atmosphere.
101,325 Pa760 torrExactly one standard atmosphere.

Engineering Context

The torr to pascals page inverts this factor. In the pressure hub, Pa to atm and Pa to mmHg carry the same 101,325 Pa family, and psi to kPa handles the US-industrial side. Vacuum processes in thin-film and semiconductor work also relate to the energy family via deposition energies.

Pascals are the metrology unit and torr is the vacuum-hardware unit, so this conversion sits between a calibration certificate and a chamber controller. The factor is exactly 760 divided by 101,325, which is why 101,325 Pa lands on 760 torr with nothing left over. One caution belongs here: the torr and the millimeter of mercury are not the same unit, though they agree to about one part in seven million for standard gravity and standard mercury density. That difference is irrelevant to a roughing pump and very relevant to a barometer, so the two names should not be used interchangeably in precision work.

More: torr to Pa · Pa to atm · Pa to mmHg · Pressure Guide · Pressure Hub

Related Unit Converters

torr to pascals Pascals to Atmospheres Pa to mmHg Pressure Conversion Guide Pressure Converters

Frequently Asked Questions

How many torr are in one pascal?

Exactly 0.0075006168270417. Since 1 atm = 101,325 Pa = 760 torr by definition, one pascal is 760/101,325 torr.

Why do vacuum specs switch between pascals and torr?

International equipment vendors write process specs in SI (pascals); legacy US chamber hardware and gauges read in torr/millitorr. The same chamber often displays one and the manual specifies the other — hence the daily conversion.

What pressure is high vacuum in torr?

High vacuum is conventionally 1×10⁻³ to 1×10⁻⁷ torr — about 0.133 to 1.33×10⁻⁵ Pa. Ultra-high vacuum starts at 1×10⁻⁷ torr. Converting the two scales is exactly what this page does.