Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine temperature scales.
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20 °C (Celsius) =
68
°F (Fahrenheit)
20 °C (Celsius) in every unit
- °C (Celsius)
- 20
- °F (Fahrenheit)
- 68
- K (Kelvin)
- 293.15
- °R (Rankine)
- 527.67
Reference Points
Freezing (water): 0°C = 32°F = 273.15K
Room temp: 20°C = 68°F = 293.15K
Body temp: 37°C = 98.6°F = 310.15K
Boiling (water): 100°C = 212°F = 373.15K
Quick Tips
Rough conversion: °F ≈ °C × 2 + 30
Accurate formula: °F = (°C × 1.8) + 32
Celsius is metric and used worldwide except USA
Kelvin: No degree symbol, used in science
How to use the Temperature
Enter a temperature value, select the current scale (Celsius, Fahrenheit, Kelvin, or Rankine), choose your target scale, and the conversion displays instantly. Essential for cooking, science, and weather.
Formula
Celsius ↔ Fahrenheit: °F = (°C × 9/5) + 32
Celsius ↔ Kelvin: K = °C + 273.15
Rankine: °R = (°C + 273.15) × 9/5 = °F + 459.67
History & interesting facts
Did you know?
Absolute zero (−273.15°C, −459.67°F, 0K) is the lowest possible temperature in the universe, where all molecular motion theoretically stops.
Origin & history
Celsius (1742): Named after Anders Celsius, water freezes at 0°C and boils at 100°C. Fahrenheit (1724): Named after Daniel Fahrenheit, uses water 32°F-212°F. Kelvin: SI unit, absolute zero at 0K.
Fascinating facts
- 1
Room temperature is typically 20-25°C (68-77°F)
- 2
Typical body temperature is about 37°C (98.6°F)
- 3
Water boils at 100°C (212°F) at sea level
- 4
The formula for Celsius to Fahrenheit: multiply by 1.8, then add 32
- 5
Kelvin is used in science because it has no negative values
- 6
Rankine is rarely used except in engineering
Frequently asked questions
What is absolute zero?
Absolute zero is the lowest possible temperature: −273.15°C, −459.67°F, or 0K. All molecular motion theoretically stops here.
Why is Kelvin used in science?
Kelvin is the SI unit of temperature. It starts at absolute zero and has no negative values, making calculations and ratios simpler.
What is room temperature?
Room temperature is typically 20-25°C (68-77°F), which is 293-298K. It varies by location and preference.