Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur scales.
Enter Temperature
📝 Conversion Formulas
°C = (°F - 32) × 5/9
°C = K - 273.15
°F = °R - 459.67
°C = °Ré × 5/4
Note: This calculator provides precise temperature conversions using standard formulas. For scientific applications, consider atmospheric pressure effects on boiling/freezing points. Medical temperature readings should always be verified with calibrated instruments.
Understanding Temperature Scales
Learn about different temperature measurements and their practical applications
Temperature Scales Explained
Celsius
Water freezes at 0°C, boils at 100°C. Used worldwide and in science.
Fahrenheit
Water freezes at 32°F, boils at 212°F. Primary scale in the United States.
Kelvin
Absolute temperature scale starting at absolute zero. Used in scientific calculations.
Rankine
Absolute scale using Fahrenheit degrees. Zero Rankine equals -459.67°F.
Quick Conversion Tips
Quick Estimate
°C to °F ≈ double and add 30
Key Reference Points
0°C = 32°F, 100°C = 212°F
Remember
Room temperature ≈ 20°C = 68°F = 293K
Absolute Scale Rule
Kelvin and Rankine are always positive (no negative values)
Quick Reference Temperatures
Temperature Extremes & Fascinating Facts
Discover interesting temperature records and scientific phenomena
Absolute Zero
The coldest possible temperature: -459.67°F or -273.15°C or 0K. At this point, all molecular motion theoretically stops.
Hottest on Earth
Death Valley reached 134°F (56.7°C) in 1913 - the highest reliably recorded air temperature on Earth.
Liquid Nitrogen
Boils at -321°F (-196°C). Used in scientific research, food preservation, and medical applications.
Human Body
Normal body temperature ranges from 96.8-100.4°F (36-38°C), with 98.6°F (37°C) being average.
Sun's Core
Reaches approximately 27 million°F (15 million°C) - hot enough to fuse hydrogen into helium.
Outer Space
Space has a background temperature of -454°F (-270°C) - just 2.7 degrees above absolute zero.