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Fahrenheit Converter

Convert Fahrenheit temperatures to Celsius and Kelvin, and back, using the exact affine relationships.

Formula shown0 inputs definedUpdated Nov 2025By CalcuTotal TeamFree, no sign-up

Quick Summary

Use this when you need:

Convert weather reports from °F to °C for international audiences
Check firmware readings that report °F while dashboards need °C or K
Normalize lab temperatures into Kelvin for calculations

You’ll get:Temperature

How this is calculated

Formula:

°C = (°F - 32) × 5/9

In plain language:

Fahrenheit and Celsius are affine scales. Subtract 32 and scale by 5/9 to reach Celsius; add 273.15 to reach Kelvin. Reverse with (°C × 9/5) + 32.

The formula is always visible so you can verify the math and explain your numbers to anyone who asks.

What these terms mean

Temperature

Temperature used in the calculation.

When to use this calculator

Convert weather reports from °F to °C for international audiences
Check firmware readings that report °F while dashboards need °C or K
Normalize lab temperatures into Kelvin for calculations

Last updated: November 26, 2025

Fahrenheit converter explained

Switch between Fahrenheit, Celsius, and Kelvin without retyping formulas. The tool centers on Fahrenheit inputs but supports two-way conversion for all three scales.

How the conversion works

Fahrenheit is an affine scale. Convert by shifting and scaling relative to Celsius, then offsetting Kelvin by 273.15:

\text{°C} = (\text{°F} - 32) \times \tfrac{5}{9}

K = \text{°C} + 273.15

Reverse directions:

\text{°F} = \text{°C} \times \tfrac{9}{5} + 32

\text{°F} = (K - 273.15) \times \tfrac{9}{5} + 32

Units and conversions

Scale	Symbol	Relation
Fahrenheit	°F	reference scale
Celsius	°C	°C = (°F − 32) × 5/9
Kelvin	K	K = (°F − 32) × 5/9 + 273.15

Worked examples

Weather forecast check Given 68 °F:
$\text{°C} = (68 - 32) \times \tfrac{5}{9} = 20.0\,\text{°C}$ $K = 20.0 + 273.15 = 293.15\,\text{K}$
Result: 20.0 °C, 293.15 K.
Lab equipment readout Given 310 K:
$\text{°C} = 310 - 273.15 = 36.85\,\text{°C}$ $\text{°F} = 36.85 \times \tfrac{9}{5} + 32 = 98.33\,\text{°F}$
Result: 36.85 °C, 98.33 °F.

Tips and pitfalls

Temperature differences behave differently: a change of 1 K equals a change of 1 °C but equals 1.8 °F.
For cooking, round to whole degrees; for lab work, keep one or two decimals.
Kelvin never drops below zero; if a calculation yields negative K, a sign flipped.

References and further reading

Frequently Asked Questions

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Calculator info

Version:: v1.0.0
Last reviewed:: Nov 26, 2025
Sensitivity:: low

Last updated: November 26, 2025

Fahrenheit converter explained

Switch between Fahrenheit, Celsius, and Kelvin without retyping formulas. The tool centers on Fahrenheit inputs but supports two-way conversion for all three scales.

How the conversion works

Fahrenheit is an affine scale. Convert by shifting and scaling relative to Celsius, then offsetting Kelvin by 273.15:

\text{°C} = (\text{°F} - 32) \times \tfrac{5}{9}

K = \text{°C} + 273.15

Reverse directions:

\text{°F} = \text{°C} \times \tfrac{9}{5} + 32

\text{°F} = (K - 273.15) \times \tfrac{9}{5} + 32

Units and conversions

Scale	Symbol	Relation
Fahrenheit	°F	reference scale
Celsius	°C	°C = (°F − 32) × 5/9
Kelvin	K	K = (°F − 32) × 5/9 + 273.15

Worked examples

Weather forecast check Given 68 °F:
$\text{°C} = (68 - 32) \times \tfrac{5}{9} = 20.0\,\text{°C}$ $K = 20.0 + 273.15 = 293.15\,\text{K}$
Result: 20.0 °C, 293.15 K.
Lab equipment readout Given 310 K:
$\text{°C} = 310 - 273.15 = 36.85\,\text{°C}$ $\text{°F} = 36.85 \times \tfrac{9}{5} + 32 = 98.33\,\text{°F}$
Result: 36.85 °C, 98.33 °F.

Tips and pitfalls

Temperature differences behave differently: a change of 1 K equals a change of 1 °C but equals 1.8 °F.
For cooking, round to whole degrees; for lab work, keep one or two decimals.
Kelvin never drops below zero; if a calculation yields negative K, a sign flipped.

Quick Summary

Calculator Tool

How this is calculated

What these terms mean

Temperature

When to use this calculator

Fahrenheit converter explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

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Calculator info

Fahrenheit converter explained

How the conversion works

Units and conversions

Worked examples

Tips and pitfalls

References and further reading

Frequently Asked Questions

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