Instant Conversion
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Multiple Scales
Celsius, Fahrenheit, Kelvin, Rankine
Precise Results
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How to Convert Temperature Units Online
Step-by-Step Instructions:
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Enter Temperature: Type the temperature value you want to convert.
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Select Source Scale: Choose from Celsius, Fahrenheit, Kelvin, or Rankine.
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Select Target Scale: Choose your desired temperature scale.
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Get Results: Click "Convert" for instant accurate conversion.
Key Temperature Points:
- Water freezes: 0°C = 32°F = 273.15 K
- Water boils: 100°C = 212°F = 373.15 K
- Absolute zero: -273.15°C = -459.67°F = 0 K
- Body temperature: 37°C = 98.6°F = 310.15 K
- Room temperature: 20°C = 68°F = 293.15 K
Understanding Temperature Scales
Celsius (°C)
Used: Worldwide standard, metric system
Zero point: Water freezing point
Scale: 0°C (freezing) to 100°C (boiling)
Fahrenheit (°F)
Used: United States, some Caribbean countries
Zero point: Brine freezing point
Scale: 32°F (freezing) to 212°F (boiling)
Kelvin (K)
Used: Scientific research, physics, chemistry
Zero point: Absolute zero (-273.15°C)
Scale: 273.15 K (freezing) to 373.15 K (boiling)
Rankine (°R)
Used: Engineering applications in US
Zero point: Absolute zero
Scale: 491.67°R (freezing) to 671.67°R (boiling)
When to Use Temperature Conversion
Cooking & Baking
Convert oven temperatures between Celsius and Fahrenheit for international recipes.
Travel & Weather
Understand weather forecasts when traveling between countries using different scales.
Science & Research
Convert between Kelvin and Celsius for scientific experiments and calculations.
Health & Medicine
Convert body temperature readings between different measurement systems.
Engineering
Work with temperature specifications in manufacturing and industrial processes.
Education
Learn and practice temperature conversions for science and math studies.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Use the formula: °F = (°C × 9/5) + 32. For example, 20°C × 9/5 = 36, then 36 + 32 = 68°F. Our converter performs this calculation instantly.
What is the freezing point of water in different scales?
Water freezes at 0°C (Celsius), 32°F (Fahrenheit), 273.15 K (Kelvin), and 491.67°R (Rankine) under standard atmospheric pressure at sea level.
What is Kelvin and when is it used?
Kelvin is the SI base unit for temperature, starting at absolute zero (the coldest possible temperature). It's used in scientific research, physics, chemistry, and astronomy. 0 K equals -273.15°C or -459.67°F.
Why does the US use Fahrenheit?
The United States adopted Fahrenheit before the metric system became widespread. While most countries switched to Celsius, the US continues using Fahrenheit for everyday temperature measurements, though Celsius is used in scientific contexts.
What is absolute zero?
Absolute zero is the lowest possible temperature where all molecular motion stops. It equals 0 K, -273.15°C, or -459.67°F. It's theoretically impossible to reach absolute zero.
Is this temperature converter free?
Yes, completely free with no registration or limits. Convert unlimited temperature measurements between any supported scales anytime.
Temperature Conversion Formulas
From Celsius:
- °F = (°C × 9/5) + 32
- K = °C + 273.15
- °R = (°C × 9/5) + 491.67
From Fahrenheit:
- °C = (°F - 32) × 5/9
- K = (°F - 32) × 5/9 + 273.15
- °R = °F + 459.67