TemperatureFahrenheit to Celsius

Fahrenheit to Celsius

Snapshot

1 Fahrenheit equals -17.222222 Celsius. Conversion Encyclopedia uses the same fixed conversion basis across the calculator, common values, and reverse page for this page.

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.
Use the reverse page if you need the opposite direction with the same basis.

Use the interactive calculator below for custom values and the common-value table for quick checks.

Interactive conversion

Converter Calculator

-17.222222 Celsius (°C)

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Machine access

Available to apps and AI agents

Fahrenheit to Celsius can be requested through Conversion Encyclopedia's structured interfaces by software and compatible AI agents. The identifiers below select the same calculation as the calculator.

Machine-readable identifiers

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

The JSON API and OpenAPI specification use the identifiers to reach the conversion engine. WebMCP lets compatible AI agents request the same calculation.

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/"
  }
}

Full API documentation

Explanation

Use this page when you want a direct Fahrenheit to Celsius conversion. On this page, 1 Fahrenheit equals -17.222222 Celsius.

The direct answer, calculator, common values table, and FAQ all follow the same exact equation for this route: 1 Fahrenheit equals -17.2222222222 Celsius..

Fahrenheit (deg F): a temperature scale used mainly in the United States for weather, cooking, and household references.

Celsius (deg C): a relative temperature scale widely used in weather, science, and everyday measurement.

This route is useful for weather, cooking, HVAC, travel, and international references where fahrenheit and celsius describe the same physical temperature on different scales.

This conversion uses an affine temperature equation with scale and/or offset terms, so forward and reverse pages must use inverse formulas rather than one shared factor.

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.