Temperature Converter

Quick, accurate, and free temperature unit conversions

Temperature Converter

Celsius:0
Fahrenheit:0
Kelvin:0
Fact Bulb 0°C is the freezing point of water 🧊

Understanding Temperature Scales and Conversion

The Three Main Temperature Scales

Temperature is one of the most commonly measured physical properties, but different regions and scientific fields use different scales. Understanding these scales and how to convert between them is essential for international communication, scientific research, cooking, and weather reporting.

Celsius (°C)

Used by most countries worldwide and in scientific contexts. Based on the properties of water:

  • 0°C - Water freezing point
  • 100°C - Water boiling point

Fahrenheit (°F)

Primarily used in the United States and a few other countries. Based on:

  • 32°F - Water freezing point
  • 212°F - Water boiling point

Kelvin (K)

The SI base unit for temperature, used in scientific contexts. Based on absolute zero:

  • 0K - Absolute zero (-273.15°C)
  • 273.15K - Water freezing point

Temperature Conversion Formulas

Converting between temperature scales requires specific mathematical formulas. Unlike most unit conversions, temperature conversions aren't simple multiplication factors because the scales have different zero points.

Celsius to Fahrenheit

°F = (°C × 9/5) + 32

Fahrenheit to Celsius

°C = (°F - 32) × 5/9

Celsius to Kelvin

K = °C + 273.15

Common Temperature Reference Points

Reference Celsius Fahrenheit Kelvin
Absolute Zero -273.15°C -459.67°F 0K
Water Freezing Point 0°C 32°F 273.15K
Room Temperature 20°C 68°F 293.15K
Human Body Temp 37°C 98.6°F 310.15K
Water Boiling Point 100°C 212°F 373.15K

Tips for Accurate Temperature Conversion

  1. Use the correct formulas - Temperature conversions aren't simple ratios like other unit conversions.
  2. Understand the context - Different applications require different levels of precision.
  3. Be aware of rounding conventions - Weather temperatures are typically rounded to whole degrees, while scientific measurements may need more precision.

Quick Approximation: For a rough Celsius to Fahrenheit conversion, double the Celsius temperature and add 30. This gives a reasonable estimate for everyday temperatures (e.g., 20°C ≈ 20×2+30 = 70°F, actual value is 68°F).