TemperatureFahrenheit to Celsius

Fahrenheit to Celsius

Methodology·How We Verify

Snapshot

1 Fahrenheit equals -17.222222 Celsius.

Reference basis: This conversion uses a scale-and-offset equation (1 Fahrenheit equals -17.2222222222 Celsius.).
Example: For 20 Fahrenheit, the converted value equals -6.666667 Celsius.

Interactive conversion

Converter Calculator

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

-17.222222 Celsius (°C)

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API and AI agent access

Fahrenheit to Celsius.

Machine-readable identifiers

Conversion family: temperature
Source unit: fahrenheit
Target unit: celsius

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": "temperature",
  "value": 1,
  "from": "fahrenheit",
  "to": "celsius"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "temperature",
    "value": 1,
    "from": "fahrenheit",
    "to": "celsius",
    "result": {
      "raw": -17.22222222222222,
      "display": "-17.222222"
    },
    "canonicalPath": "/temperature/fahrenheit-to-celsius/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

The converter converts Fahrenheit into Celsius with the exact affine formula C = (F - 32) × 5/9. The same equation drives the direct answer, calculator, common values, and mirror Celsius to Fahrenheit page so reverse routes stay numerically aligned.

Method & Reference

Method basis: exact affine formula (scale + offset) shown in Snapshot.
Equation reference: use the Snapshot formula shown for this route.
Consistency rule: forward and reverse pages use inverse equations to preserve scale reference points.

Common Conversion Values

Fahrenheit (°F)	Celsius (°C)
-40	-40
-20	-28.888889
0	-17.777778
20	-6.666667
32	0
37	2.777778
50	10
100	37.777778
212	100

Questions & answers

Frequently Asked Questions

What is 1 Fahrenheit in Celsius?

1 Fahrenheit equals -17.222222 Celsius on this page.

What equation does this Fahrenheit to Celsius page use?

This page uses 1 Fahrenheit equals -17.2222222222 Celsius., and the same equation drives the direct answer, calculator, table, and FAQ.

Is there a reverse page for Celsius to Fahrenheit?

Yes. The reverse direction has its own page at Celsius to Fahrenheit, where the inverse equation is used so the mirror route stays numerically aligned.