Temperature Converter

Convert temperature values instantly between Celsius, Fahrenheit, Kelvin, and Rankine.

How Temperature Conversion Works

Temperature scales measure thermal energy differently. Celsius is used globally, Fahrenheit in the US, Kelvin in scientific contexts, and Rankine in thermodynamics.

Temperature Conversion Formulas

Celsius ↔ Fahrenheit:
  F = (C × 9/5) + 32
  C = (F − 32) × 5/9

Celsius ↔ Kelvin:
  K = C + 273.15
  C = K − 273.15

Fahrenheit ↔ Rankine:
  R = F + 459.67
  F = R − 459.67

Kelvin ↔ Rankine:
  R = K × 1.8
  K = R ÷ 1.8

Which Scale Should You Use?

  • Celsius (°C): everyday temperatures
  • Fahrenheit (°F): used in the US for weather
  • Kelvin (K): scientific absolute scale
  • Rankine (°R): engineering thermodynamic scale

Examples

  • 0°C = 32°F
  • 100°C = 212°F
  • 0 K = -273.15°C
  • 300 K = 80.33°F

Frequently Asked Questions

Yes. Celsius and Fahrenheit allow negative values. Kelvin and Rankine start at absolute zero.
No, Kelvin is mainly used in science, physics, and chemistry.
Different countries and scientific fields use different temperature standards.