Temperature Converter
Converts temperature between all four scales. Unlike every other converter here, temperature needs an offset as well as a factor — the scales do not share a zero point, so you cannot convert by multiplying alone.
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The formula
result = value × (from factor ÷ to factor)
Each temperature unit is defined by its size relative to the Kelvin, so converting between any two is a single multiplication.
Every temperature unit
| Unit | Symbol | In one Kelvin |
|---|---|---|
| Celsius | °C | — |
| Fahrenheit | °F | — |
| Kelvin | K | — |
| Rankine | °R | — |
Frequently Asked Questions
What is the formula for Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. Going the other way, °C = (°F − 32) × 5/9.
Is there a temperature where Celsius and Fahrenheit are equal?
Yes — −40°. That is the single point where the two scales cross, which makes it a useful sanity check on any conversion.
What is absolute zero?
0 K, which is −273.15 °C or −459.67 °F. Kelvin and Rankine both start there, which is why they never go negative.