🌡️ Temperature Converter

Temperature Unit Converter
( °C, °F, K, °R )

Convert between Celsius, Fahrenheit, Kelvin, and Rankine using exact formulas. Enter any value, get instant results.

Converter Tool
°C
°F
From
    To
      Result
      0 °C = 32 °F
      32
      °F
      The Formula
      °F = °C × 9/5 + 32
      0 °C = 32 °F
      0°C= 32°F
      100°C= 212°F
      0 K= -273.15°C
      0°R= -459.67°F
      Unit Reference Table

      Key temperature points across all scales.

      Kelvin (K)Celsius (°C)Fahrenheit (°F)Rankine (°R)Description

      Understanding Temperature Scales

      Temperature is measured using several scales. The most common are Celsius (°C) and Fahrenheit (°F). In science, Kelvin (K) is the standard absolute scale. Rankine (°R) is an absolute scale with the same degree size as Fahrenheit, used mainly in engineering.

      Key Formulas

      • Celsius to Fahrenheit: °F = °C × 9/5 + 32
      • Fahrenheit to Celsius: °C = (°F – 32) × 5/9
      • Celsius to Kelvin: K = °C + 273.15
      • Kelvin to Celsius: °C = K – 273.15
      • Fahrenheit to Rankine: °R = °F + 459.67
      • Rankine to Fahrenheit: °F = °R – 459.67
      • Kelvin to Rankine: °R = K × 9/5
      • Rankine to Kelvin: K = °R × 5/9

      Important Fixed Points

      Water freezes at 0°C / 32°F / 273.15 K / 491.67°R.
      Water boils at 100°C / 212°F / 373.15 K / 671.67°R.
      Absolute zero is 0 K = -273.15°C = -459.67°F = 0°R.

      Frequently Asked Questions
      How do I convert Celsius to Fahrenheit quickly? +
      Double the Celsius value, subtract 10%, then add 32 for an estimate. Exact formula: °F = °C × 9/5 + 32.
      What is 20°C in Fahrenheit? +
      20°C × 9/5 + 32 = 68°F.
      How do I convert Fahrenheit to Celsius? +
      °C = (°F – 32) × 5/9. For example, 68°F – 32 = 36, × 5/9 = 20°C.
      What is absolute zero in all scales? +
      0 K = -273.15°C = -459.67°F = 0°R.
      What is the Rankine scale used for? +
      Rankine is used in some engineering fields, especially in the U.S., because it is an absolute scale with the same degree size as Fahrenheit.
      How do I convert Kelvin to Rankine? +
      °R = K × 9/5. For example, 300 K × 9/5 = 540°R.
      All Temperature Conversion Pages

      Browse all dedicated conversion pages, organized by unit.

      ✓ Copied to clipboard!