How do you convert Celsius to Fahrenheit?

Multiply Celsius by 1.8 (or 9/5) and add 32: °F = (°C × 1.8) + 32.

At what point are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are exactly equal at -40 degrees (-40 °C = -40 °F).

What is absolute zero in Kelvin and Celsius?

Absolute zero is 0 Kelvin, which equals -273.15 °C (-459.67 °F).

Why does the Kelvin scale not use degrees?

Kelvin is an absolute temperature scale starting at absolute zero (the point where molecular motion theoretically stops), so its units are simply called "kelvins," not "degrees Kelvin" — unlike Celsius and Fahrenheit, which are relative scales based on reference points like water's freezing point.

How do I convert Kelvin to Celsius?

Subtract 273.15: °C = K - 273.15. For example, 300 K equals 26.85°C.

Temperature Converter

Instant, precise temperature converter with live formula explanations and interactive lookup tables.

TL;DR: Temperature Converter performs exact deterministic conversion across temperature units with zero server latency.

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Mathematical Formula

Reference Conversion Table

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Why Use This Tool?

Temperature Converter switches between Celsius, Fahrenheit, and Kelvin instantly — useful for reading weather forecasts, cooking temperatures, and scientific measurements from a different scale.

How to Use the Temperature Converter

Our Temperature Converter uses exact international metrology factors to deliver accurate and reliable conversions right inside your web browser. Choose your starting unit and target unit, then type a value — the conversion updates instantly.

Celsius	Fahrenheit	Kelvin
0°C	32°F	273.15 K
20°C	68°F	293.15 K
100°C	212°F	373.15 K
-273.15°C	-459.67°F	0 K (absolute zero)

Mathematical Formula & Methodology

Here is the standard mathematical equation used to calculate this result accurately:

^\circ\text{F} = (^\circ\text{C} \times \frac{9}{5}) + 32, \quad \text{K} = ^\circ\text{C} + 273.15

Formula Variables Explained:
Thermodynamic temperature scale conversions across Celsius, Fahrenheit, and Kelvin.

Step-by-Step Worked Example

Converting 25°C to Fahrenheit: $(25 \times 1.8) + 32 = 45 + 32 = 77^\circ\text{F}$.

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Frequently Asked Questions

: Multiply Celsius by 1.8 (or 9/5) and add 32: °F = (°C × 1.8) + 32.
: Celsius and Fahrenheit are exactly equal at -40 degrees (-40 °C = -40 °F).
: Absolute zero is 0 Kelvin, which equals -273.15 °C (-459.67 °F).
: Kelvin is an absolute temperature scale starting at absolute zero (the point where molecular motion theoretically stops), so its units are simply called "kelvins," not "degrees Kelvin" — unlike Celsius and Fahrenheit, which are relative scales based on reference points like water's freezing point.
: Subtract 273.15: °C = K - 273.15. For example, 300 K equals 26.85°C.

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