Is 1 mmHg the same as 1 Torr?

They are treated as equal in most practice. A Torr is exactly 101325/760 Pa. Using conventional mercury density 13,595.1 kg/m³ at 0 °C and standard gravity gives 1 mmHg = 133.322387415 Pa, or approximately 1.000000142466 Torr.

What conversion factor does this tool use?

The tool uses 133.322387415 ÷ (101325/760), or approximately 1.000000142466 Torr per conventional mmHg. For everyday use the units are interchangeable.

When does the mmHg vs Torr difference matter?

The approximately 0.000014% distinction is relevant only when a calculation explicitly requires the conventional mercury-column realization. In medicine and most engineering work the units are used interchangeably.

How do I convert mmHg to Torr manually?

Multiply conventional mmHg by approximately 1.000000142466. For example, 760 mmHg is approximately 760.000108 Torr.

What is standard atmospheric pressure in mmHg and Torr?

Standard atmospheric pressure is exactly 760 Torr (= 101,325 Pa). With the conventional mmHg realization used here, it is approximately 759.999892 mmHg.

mmHg to Torr Converter

Convert conventional mmHg to Torr (and back) — the two units differ by only about 0.000014%.

Converter

Pressure in mmHg

Result in Torr

Reverse: Torr to mmHg

Pressure in Torr

Result in mmHg

Factor used: 1 conventional mmHg ≈ 1.000000142466 Torr. For most applications, treating 1 mmHg = 1 Torr introduces about 0.000014% error.

Reference Table

mmHg Torr

1 mmHg 1.00000014 Torr

10 mmHg 10.0000014 Torr

100 mmHg 100.000014 Torr

120 mmHg 120.000017 Torr

200 mmHg 200.000028 Torr

300 mmHg 300.000043 Torr

500 mmHg 500.000071 Torr

760 mmHg 760.000108 Torr

1,000 mmHg 1,000.000142 Torr

5,000 mmHg 5,000.000712 Torr

10,000 mmHg 10,000.0014 Torr

Summary

Convert conventional mmHg to Torr (and back) — the two units differ by only about 0.000014%.

How it works

Enter the pressure value in mmHg in the top input field.
The converter multiplies your value by approximately 1.000000142466 to get Torr.
The result updates instantly as you type.
Use the reverse field to convert Torr back to mmHg.
Click "Copy" next to any result to copy it to the clipboard.
Check the reference table for common mmHg-to-Torr values.

Use cases

Convert blood pressure readings (mmHg) to Torr for physics calculations.
Express barometric pressure in Torr for vacuum science applications.
Cross-check pressure sensor specs that mix mmHg and Torr units.
Verify the exact mmHg vs Torr difference in high-precision metrology work.
Translate medical pressure values to Torr for gas chromatography instruments.
Convert partial-pressure readings for scientific literature comparisons.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu