Convert Torr to Pounds per Square Inch

Convert Torr (Torr) to Pounds per Square Inch (psi) instantly and accurately.

Torr (Torr)
Pounds per Square Inch (psi)

Conversion Formula

psi = Torr × 0.0193367747

About Torr

The torr is defined as exactly 1/760 of a standard atmosphere ≈ 133.322 Pa - effectively replacing mmHg with an exact definition. Named after Evangelista Torricelli (1608-1647), inventor of the barometer. Vacuum science universally uses torr: rough vacuum 760-1 torr; medium vacuum 1-10⁻³ torr; high vacuum 10⁻³-10⁻⁷ torr; ultra-high vacuum below 10⁻⁹ torr. UHV systems for surface science, particle accelerator beam tubes, and space simulation chambers reach 10⁻¹¹-10⁻¹² torr. 1 torr = 133.322 Pa.

About Pounds per Square Inch

One pound per square inch (psi) ≈ 6,894.76 Pa - the dominant pressure unit in US industry and consumer products. Car tyres: 32-36 psi; truck tyres 80-120 psi; bicycle road tyres 80-130 psi. Home water supply: 40-80 psi; residential maximum 80 psi per plumbing code. Compressed air tools: 90-150 psi. Steam autoclave sterilisation: 15-30 psi. The distinction between gauge (psig) and absolute (psia) pressure is critical: gauge pressure is relative to ambient; absolute = gauge + ~14.696 psi. 1 psi = 6,894.76 Pa.

Quick Reference Table

Torr (Torr)Pounds per Square Inch (psi)
1 Torr0.0193368 psi
2 Torr0.0386735 psi
5 Torr0.0966839 psi
10 Torr0.193368 psi
25 Torr0.483419 psi
50 Torr0.966839 psi
100 Torr1.93368 psi

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