Temperature Converters
6 tools available
Fahrenheit to Celsius
°C = (°F − 32) × 5/9
Celsius to Fahrenheit
°F = (°C × 9/5) + 32
Celsius to Kelvin
K = °C + 273.15
Kelvin to Celsius
°C = K − 273.15
Fahrenheit to Kelvin
K = (°F - 32) × 5/9 + 273.15
Kelvin to Fahrenheit
°F = (K - 273.15) × 9/5 + 32
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Complete Guide to Temperature Unit Conversions
Temperature conversion is uniquely complex because the three main scales — Celsius, Fahrenheit, and Kelvin — do not share a common zero point or degree size. Converting requires both multiplication and addition (°F = °C × 9/5 + 32), unlike most unit conversions which use simple multiplication. Celsius and Kelvin share the same degree size but are offset by 273.15 degrees. Fahrenheit degrees are smaller (5/9 the size of Celsius degrees), which gives Fahrenheit more resolution for weather temperatures — a useful property for distinguishing comfortable indoor temperatures. All three scales intersect at −40, where −40 °C = −40 °F exactly.
When to Use Temperature Conversions
- Reading weather forecasts when traveling — European forecasts use Celsius, US forecasts use Fahrenheit.
- Following cooking recipes from other countries. A UK recipe calling for 180 °C equals 356 °F (typically rounded to 350 °F).
- Setting medical fever thresholds: 37 °C = 98.6 °F (normal), 38 °C = 100.4 °F (fever).
- Scientific work requiring Kelvin, where 0 K is absolute zero (−273.15 °C), the lowest theoretically possible temperature.
Common Temperature Conversion Mistakes
- 1Trying to convert temperature by simple multiplication. Unlike length or weight, temperature requires both multiplying and adding/subtracting.
- 2Assuming "double the Celsius to get Fahrenheit" works beyond rough estimates. 20 °C is 68 °F, not 40 °F.
- 3Confusing Celsius and Fahrenheit in oven settings. A recipe at 350 °F requires about 175 °C — setting your oven to 350 °C (662 °F) will burn food instantly.
- 4Using Celsius/Fahrenheit in scientific contexts that require Kelvin. Gas law calculations (PV = nRT) only work with absolute temperature.