Online Temperature Converter

Our free online Temperature Converter allows you to convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Perfect for weather, cooking, science, engineering, and everyday use. Accurate temperature conversion with real-time results.

Features:

• Celsius (°C): Metric temperature scale, water freezes at 0°C and boils at 100°C.
• Fahrenheit (°F): Imperial scale, water freezes at 32°F and boils at 212°F.
• Kelvin (K): Absolute temperature scale starting at absolute zero (0K = -273.15°C).
• Rankine (°R): Absolute scale based on Fahrenheit increments.
• Real-time Conversion: Instant results as you type with high precision.

1. Temperature Scales Explained

Celsius (°C): Used worldwide. Based on water's freezing (0°C) and boiling (100°C) points at sea level.
Fahrenheit (°F): Used primarily in the USA. More granular scale with 180 degrees between water's freezing and boiling.
Kelvin (K): Scientific standard. Starts at absolute zero (no molecular motion). No degree symbol used.
Rankine (°R): Like Kelvin but using Fahrenheit increments. Rarely used outside thermodynamics.

2. Conversion 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 Kelvin: K = (°F + 459.67) × 5/9

3. Practical Applications

• Weather & Climate: Understanding forecasts when traveling internationally
• Cooking & Baking: Converting oven temperatures between recipes
• Science & Lab Work: Chemistry, physics experiments require Kelvin or Celsius
• HVAC & Engineering: Heating, cooling system specifications
• Medical: Body temperature readings (fever thresholds vary by scale)

4. Temperature Conversion Tips

Quick Mental Math:
• C to F: Double it, subtract 10%, add 32 (approximate)
• F to C: Subtract 30, then halve (rough estimate)
• -40°C = -40°F (the only point where C and F are equal)
• 0°C = 32°F (water freezes)
• 100°C = 212°F (water boils)

5. Important Temperature Facts

• Absolute Zero: -273.15°C / -459.67°F / 0K - coldest possible temperature
• Room Temperature: Typically 20-22°C (68-72°F)
• Human Body: Normal is 37°C (98.6°F), fever is 38°C+ (100.4°F+)
• Oven Temperatures: Recipes vary: 180°C = 350°F (moderate), 200°C = 400°F (hot)
• Freezer: Should be -18°C (0°F) or colder for food safety