🌡️ Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly.
C → F: (°C × 9/5) + 32
F → C: (°F − 32) × 5/9
C → K: °C + 273.15
K → C: K − 273.15
Temperature Scales Explained
Four main temperature scales are used globally. Celsius (°C) is the international standard used in India, Europe, and most of the world. Fahrenheit (°F) is used primarily in the United States. Kelvin (K) is the SI unit used in science — it starts at absolute zero, the coldest possible temperature. Rankine (°R) is used in some US engineering applications.
Key Reference Points
Absolute Zero: −273.15°C = −459.67°F = 0K (no molecular motion possible)
Water Freezes: 0°C = 32°F = 273.15K
Room Temperature: 22–25°C = 72–77°F = 295–298K
Human Body: 37°C = 98.6°F = 310.15K
Water Boils: 100°C = 212°F = 373.15K
Water Freezes: 0°C = 32°F = 273.15K
Room Temperature: 22–25°C = 72–77°F = 295–298K
Human Body: 37°C = 98.6°F = 310.15K
Water Boils: 100°C = 212°F = 373.15K
Quick Conversion Tricks
Easy °C to °F Estimate
Quick approximation: double the Celsius and add 30. So 25°C ≈ 80°F (actual is 77°F). Not exact but good for quick mental estimates when travelling abroad.
Indian Weather Context
India summer: 35–45°C (95–113°F). Pleasant winter: 15–22°C (59–72°F). Hill stations in winter: −5 to 5°C (23–41°F). AC setpoint: 24°C (75°F) recommended by BEE for energy efficiency.
Cooking Temperatures
Oven: 180°C = 356°F (moderate baking). Deep fry: 175–190°C = 347–374°F. Sugar caramel: 170°C = 338°F. Most Indian recipes use °C but international recipes often use °F.
Why Kelvin for Science?
Kelvin has no negative values, making equations in physics and chemistry simpler. Gas laws (PV=nRT) require temperature in Kelvin. 0K is the theoretical limit of cold — nothing can be colder.