PressureMmhg to Atm

Millimeters of Mercury to Atmospheres

Methodology·How We Verify

Snapshot

1 Millimeters of Mercury equals 0.001316 Atmospheres.

Reference basis: This conversion uses exact pascal-based pressure definitions.
Example: For 0.1 Millimeters of Mercury, the result equals 0.000132 Atmospheres.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

0.001316 Atmospheres (atm)

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API and AI agent access

Millimeters of Mercury to Atmospheres.

Machine-readable identifiers

Conversion family: pressure
Source unit: mmhg
Target unit: atm

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "pressure",
  "value": 1,
  "from": "mmhg",
  "to": "atm"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "pressure",
    "value": 1,
    "from": "mmhg",
    "to": "atm",
    "result": {
      "raw": 0.0013157896611398965,
      "display": "0.001316"
    },
    "canonicalPath": "/pressure/mmhg-to-atm/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Convert mmHg to Pa with 133.322387415, then divide by 101,325 Pa per atm.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 Millimeters of Mercury = 0.001316 Atmospheres (using exact pascal-based pressure definitions).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

Millimeters of Mercury (mmHg)	Atmospheres (atm)
0.1	0.000132
1/2	0.000658
1	0.001316
5	0.006579
10	0.013158
14.7	0.019342
29.92	0.039368
100	0.131579
101.325	0.133322
1000	1.31579

Questions & answers

Frequently Asked Questions

What is 1 millimeters of mercury in atmospheres?

1 Millimeters of Mercury equals 0.001316 Atmospheres on this page.

When would I convert millimeters of mercury to atmospheres?

This route is useful when translating pressure values across SI, metric engineering, and imperial conventions so datasheets, gauges, and calculations stay comparable.

How do I reverse Millimeters of Mercury to Atmospheres?

Use the mirror Atmospheres to Millimeters of Mercury route; it applies the inverse relationship with the same pressure assumptions.