Temperature conversion

Fahrenheit to Celsius conversion

Convert Fahrenheit (°F) to Celsius (°C). Formula °C = (°F − 32) × 5/9, oven & weather examples, chart, and FAQ. Switch °F → °C or °C → °F. Try it free.

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Formulas

Core equations used by this converter.

°F → °C°C = (°F − 32) × 5/9

Exact anchors32 °F = 0 °C · 212 °F = 100 °C

°C → °F°F = °C × 9/5 + 32

iTemperature conversions are affine (scale + offset), not a single multiply. Absolute zero is 0 K = −273.15 °C = −459.67 °F = 0 °R.

How to use

1

Choose °F → °C or °C → °F

Use the tabs to switch direction. Forward mode needs fahrenheit; reverse uses the opposite unit.

2

Enter the temperature

Type a signed value in the active unit field.

3

Convert and read the result

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Example conversions

Common values with formula and result.

ϟ

32 °F to Celsius (water freezes)

32 °F to Celsius (water freezes)

(32 − 32) × 5/9 = 0 °C

0 °C

ϟ

70 °F to Celsius (room temperature)

70 °F to Celsius (room temperature)

(70 − 32) × 5/9 = 38 × 5/9 ≈ 21.111 °C

38 × 5/9 ≈ 21.111 °C

ϟ

98.6 °F to Celsius (body temperature)

98.6 °F to Celsius (body temperature)

(98.6 − 32) × 5/9 = 66.6 × 5/9 = 37 °C

37 °C

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212 °F to Celsius (water boils at 1 atm)

212 °F to Celsius (water boils at 1 atm)

(212 − 32) × 5/9 = 180 × 5/9 = 100 °C

100 °C

Fahrenheit to Celsius conversion specification

Version 1.1.0 · Engine tested

Calculation status

Engine tested 4 published cases
Named expert review Not performed
Calculation version 1.1.0

Definition: **Fahrenheit (°F)** — US customary temperature; water freezes at **32 °F**, boils at **212 °F** (1 atm). **Celsius (°C)** — metric / SI-related scale; water freezes at **0 °C**, boils at **100 °C** (1 atm).
What it calculates: Temperature between °F and °C. Switch direction with the converter tabs.
Inputs: Fahrenheit (°F) or reverse unit (°C)
Outputs: Converted value in °C or °F
Formula: °C = (°F − 32) × 5/9 · °F = °C × 9/5 + 32
Fahrenheit to Celsius conversion table: Fahrenheit (°F) Celsius (°C) Notes
−40 °F −40 °C Same on both scales
0 °F −17.778 °C Cold
32 °F 0 °C Water freezes
50 °F 10 °C Cool
68 °F 20 °C Mild / room
70 °F 21.111 °C Indoor comfort
75 °F 23.889 °C Warm room
86 °F 30 °C Hot day
98.6 °F 37 °C Body temperature
100 °F 37.778 °C Hot weather
212 °F 100 °C Water boils (1 atm)
325 °F 162.778 °C Oven
Assumptions: Conversion runs locally in the browser; values are not uploaded.
Uses the standard factor/definition for these units.
Units: °F → °C
°C → °F
Boundary conditions: Empty or non-numeric input yields no valid result.
Negative temperatures are allowed.
Example: 32 °F → 0 °C
Validation cases: 32 °F → 0 °C
68 °F → 20 °C
98.6 °F → 37 °C
212 °F → 100 °C
Sources: ITS-90 / SI temperature scale definitions (°C, K)
Fahrenheit defined relative to Celsius: °F = °C × 9/5 + 32
Calculation version: 1.1.0

Background

Interpretation and common distinctions.

Use the converter tabs to switch direction when available. Results for Fahrenheit to Celsius conversion update locally in your browser.

Frequently asked questions

Key distinctions behind the conversion.

How do I convert °F to °C?

Subtract 32, then multiply by 5/9: **°C = (°F − 32) × 5/9**.

What is 32 °F in Celsius?

**0 °C** — freezing point of water.

What is 350 °F in Celsius?

About **176.67 °C**. See [350 Fahrenheit to Celsius](/convert/temperature/350-fahrenheit-to-celsius).

°F to °C vs °C to °F?

- °F → °C: (°F − 32) × 5/9 - °C → °F: °C × 9/5 + 32 See [Celsius to Fahrenheit](/convert/temperature/celsius-to-fahrenheit).