Calculator Suite
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine temperature scales
Popular Temperature Converter Conversions
Quick Presets
Base Unit Method
= Value in target unit
= Value in input unit
= Conversion factor to base
= Conversion factor from base
Category-Specific Formula
Temperature Scales
Celsius based on water (0° freeze, 100° boil). Fahrenheit originally used body temp as 100°. Kelvin is absolute, starting at 0.
Absolute Zero
0 K = -273.15°C = -459.67°F — where molecular motion theoretically stops.
Weather and Climate
Most countries use Celsius. Water freezes at 0°C/32°F, room temp is ~20°C/68°F, body temp is 37°C/98.6°F.
Scientific Use
Kelvin is used in physics/chemistry. Rankine is the absolute Fahrenheit scale.
°F = (°C × 9/5) + 32 and °C = (°F - 32) × 5/9. Key points: 0°C = 32°F (freezing), 100°C = 212°F (boiling),-40° is the same in both scales! Kelvin = Celsius + 273.15.
Select Scales
Choose "From" (e.g., Fahrenheit) and "To" (e.g., Celsius).
Enter Temperature
Type the temperature value.
View Result
Get the converted temperature instantly.
🌡️ Example: Body Temperature
98.6°F = 37°C = 310.15 K (normal body temp)
Assumes:
- • Standard ITS-90 temperature scale
- • Exact mathematical conversion
- • No pressure effects
Does NOT include:
- • Thermal expansion corrections
- • Altitude/pressure adjustments
- • Heat index or wind chill
Formula for C to F?
°F = (°C × 9/5) + 32. For reverse: °C = (°F - 32) × 5/9.
What is absolute zero?
0 K = -273.15°C = -459.67°F. Theoretical lowest temperature where particles have no motion.
At what temperature are C and F equal?
-40° is the same in both scales! -40°C = -40°F.
What is normal body temperature?
37°C = 98.6°F. A fever is typically above 38°C (100.4°F).
Why does Kelvin have no degree symbol?
Kelvin is an absolute scale, not relative. We write 300 K, not 300°K.