Temperature Converter Formula

Understand the math behind the temperature converter. Each variable explained with a worked example.

Use the Temperature Converter

Formulas Used

Fahrenheit

fahrenheit = celsius * 9/5 + 32

Kelvin

kelvin = celsius + 273.15

Rankine

rankine = (celsius + 273.15) * 9/5

Variables

VariableDescriptionDefault
celsiusTemperature(°C)25

How It Works

Temperature Converter

Formulas from Celsius

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

    • Worked Example

    Convert 25°C to Fahrenheit, Kelvin, and Rankine.

    celsius = 25
    1. 01°F = (25 × 9/5) + 32 = 45 + 32 = 77°F
    2. 02K = 25 + 273.15 = 298.15 K
    3. 03°R = (25 + 273.15) × 9/5 = 298.15 × 1.8 = 536.67°R

    Frequently Asked Questions

    What is absolute zero in Celsius?

    Absolute zero is -273.15°C, or 0 Kelvin.

    How do I convert Celsius to Kelvin?

    Add 273.15 to the Celsius temperature to get Kelvin.

    Learn More

    Guide

    Metric vs Imperial: A Complete Guide to the Two Measurement Systems

    Understand the differences between the metric and imperial measurement systems. Learn their history, how they compare, and when to use each system for length, weight, volume, and temperature.

    Ready to run the numbers?

    Open Temperature Converter