Temperature conversion

Celsius to Fahrenheit conversion

Celsius to Fahrenheit conversion. Exact conversion factors, worked examples, and privacy-first browser calculation on CalculatorX. Try it free.

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Formulas

Core equations used by this converter.

°C → °F°F = °C × 9/5 + 32

Exact anchors0 °C = 32 °F · 100 °C = 212 °F

°F → °C°C = (°F − 32) × 5/9

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

Choose °C → °F or °F → °C

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

Enter the temperature

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Convert and read the result

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Example conversions

Common values with formula and result.

0 °C to Fahrenheit (water freezes)

0 × 9/5 + 32 = 32 °F

32 °F

20 °C to Fahrenheit (room temperature)

20 × 9/5 + 32 = 36 + 32 = 68 °F

68 °F

37 °C to Fahrenheit (body temperature)

37 × 9/5 + 32 = 66.6 + 32 = 98.6 °F

98.6 °F

100 °C to Fahrenheit (water boils at 1 atm)

100 × 9/5 + 32 = 180 + 32 = 212 °F

212 °F

Celsius to Fahrenheit 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

Review policy

Definition: **Celsius (°C)** — metric temperature scale; water freezes at **0 °C** and boils at **100 °C** at 1 atm. **Fahrenheit (°F)** — common in the US; water freezes at **32 °F** and boils at **212 °F** at 1 atm.
What it calculates: Temperature between °C and °F. Switch direction with the converter tabs.
Inputs: Celsius (°C) or reverse unit (°F)
Outputs: Converted value in °F or °C
Formula: °F = °C × 9/5 + 32 · °C = (°F − 32) × 5/9
Celsius to Fahrenheit conversion table: Celsius (°C) Fahrenheit (°F) Notes
−40 °C −40 °F Same reading on both scales
−20 °C −4 °F Very cold
−10 °C 14 °F Freezing weather
0 °C 32 °F Water freezes
10 °C 50 °F Cool day
20 °C 68 °F Room / mild day
25 °C 77 °F Warm
30 °C 86 °F Hot day
37 °C 98.6 °F Body temperature
40 °C 104 °F Very hot / fever range
100 °C 212 °F Water boils (1 atm)
180 °C 356 °F Common baking
Assumptions: Conversion runs locally in the browser; values are not uploaded.
Uses the standard factor/definition for these units.
Units: °C → °F
°F → °C
Boundary conditions: Empty or non-numeric input yields no valid result.
Negative temperatures are allowed.
Example: 0 °C → 32 °F
Validation cases: 0 °C → 32 °F
20 °C → 68 °F
37 °C → 98.6 °F
100 °C → 212 °F
Sources: ITS-90 / SI temperature scale definitions (°C, K)
Fahrenheit defined relative to Celsius: °F = °C × 9/5 + 32
Calculation version: 1.1.0

Celsius (°C)	Fahrenheit (°F)	Notes
−40 °C	−40 °F	Same reading on both scales
−20 °C	−4 °F	Very cold
−10 °C	14 °F	Freezing weather
0 °C	32 °F	Water freezes
10 °C	50 °F	Cool day
20 °C	68 °F	Room / mild day
25 °C	77 °F	Warm
30 °C	86 °F	Hot day
37 °C	98.6 °F	Body temperature
40 °C	104 °F	Very hot / fever range
100 °C	212 °F	Water boils (1 atm)
180 °C	356 °F	Common baking

Background

Interpretation and common distinctions.

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

Frequently asked questions

Key distinctions behind the conversion.

How do I convert °C to °F?

Multiply by 9/5 (or 1.8), then add 32: **°F = °C × 9/5 + 32**.

What is 0 °C in Fahrenheit?

**32 °F** — the freezing point of water at standard pressure.

What is −40 °C in Fahrenheit?

**−40 °F**. The scales cross at −40.

°C to °F vs °F to °C?

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

How do I get Kelvin from Celsius?

**K = °C + 273.15**. See [Celsius to Kelvin](/convert/temperature/celsius-to-kelvin).