Temperature Converter
Enter a temperature and select the unit to see the equivalent in all other scales.
Reviewed by Richard Ross · Last updated April 2026
How Temperature Converter works
Celsius to Fahrenheit
°F = (°C × 9/5) + 32. Example: 100°C = 212°F. Common reference: 0°C = 32°F (water freezes), 100°C = 212°F (water boils at sea level).
Fahrenheit to Celsius
°C = (°F − 32) × 5/9. Example: 98.6°F (normal body temperature) = 37°C.
Kelvin
Kelvin is the SI base unit of temperature. 0 K is absolute zero (−273.15°C), the coldest possible temperature. K = °C + 273.15. No degree symbol is used with Kelvin.
UK and US usage
The UK uses Celsius for all official purposes — weather forecasts, cooking, medicine, and science. Fahrenheit persists in the US and is occasionally referenced in older British cookbooks that predate metrication. If a recipe lists an oven temperature of 350°F, that is approximately 180°C or Gas Mark 4, a common moderate oven temperature in British baking.
Weather and practical reference points
Useful UK weather benchmarks: 0°C is freezing (ice on roads); 10°C is cool; 20°C is mild and comfortable; 25°C is warm; 30°C+ is a UK heatwave. The UK record high is 40.3°C (July 2022). For the US, these translate to: 32°F, 50°F, 68°F, 77°F, 86°F, and 104.5°F respectively.
Oven temperatures and precision
Home ovens typically operate between 100°C and 250°C (212°F–482°F). Gas ovens use Gas Marks (Gas Mark 1 ≈ 140°C; Gas Mark 9 ≈ 240°C). Note that water boils at 100°C only at sea level (1 atm); at altitude the boiling point decreases, which matters for cooking times. For scientific work, use Kelvin to avoid negative values and enable ratio calculations.
Frequently asked questions
What is 100°C in Fahrenheit?
100°C = 212°F. This is the boiling point of water at sea level.
What is 37°C in Fahrenheit?
37°C = 98.6°F. This is average human body temperature.
What is 0°C in Fahrenheit?
0°C = 32°F. This is the freezing point of water.
At what temperature are Fahrenheit and Celsius equal?
At −40°. Both scales give −40 at this point.
What is 180°C in Fahrenheit? (oven temperature)
180°C = 356°F, approximately 350°F. This is Gas Mark 4 and one of the most common baking temperatures for cakes and biscuits.
How do I convert Celsius to Fahrenheit quickly in my head?
A quick mental approximation: double the Celsius value and add 30. So 20°C ≈ 70°F (actual: 68°F). For more accuracy: multiply by 1.8 and add 32. The shortcut is good enough for weather comparisons.
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