Need to convert between temperature scales? Our free online temperature converter makes it easy to switch between Celsius, Fahrenheit, and Kelvin instantly. Whether you're checking the weather, following a recipe, working on a science project, or traveling abroad, our tool provides accurate conversions. Support for all three major temperature scales with formulas and reference points included.
Temperature is a measure of the average kinetic energy of particles in a substance. Three main scales measure temperature: Celsius (°C) uses water's freezing (0°) and boiling (100°) points as references, Fahrenheit (°F) uses a different scale where water freezes at 32° and boils at 212°, and Kelvin (K) is an absolute scale starting at absolute zero. Our converter transforms values between these scales using precise mathematical formulas.
Our temperature converter provides: Instant conversion between Celsius, Fahrenheit, and Kelvin. Precise calculations using standard formulas. Reference temperature guide for common values. Support for all temperature ranges including negative values. Mobile-responsive design. Copy-to-clipboard functionality. Works offline. No registration required.
The converter uses established temperature 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. The tool applies the appropriate formula based on your selected scales and displays results instantly with precision to two decimal places.
Cooking and Baking - Convert oven temperatures and ingredient storage temperatures between scales. Weather - Understand forecasts when traveling internationally. Science and Education - Complete homework and lab experiments requiring temperature conversions. Medicine - Convert body temperature readings. Travel - Pack appropriate clothing based on destination weather. HVAC - Work with heating and cooling system specifications.
Our converter offers: Accuracy using precise conversion formulas. Speed with instant results. Convenience without needing to remember formulas. Universal support for all three major scales. Reference points to understand temperature context. Accessibility on any device.
Home cooks and bakers following international recipes. Students studying science and math. Travelers checking weather abroad. Medical professionals converting patient temperatures. Scientists and researchers. HVAC technicians. Weather enthusiasts.
Simply enter your temperature value, select the current scale, choose your target scale, and see the result instantly. Use the reference guide to understand common temperature points.
Check your input scale carefully. Use Kelvin for scientific calculations. Remember that Kelvin doesn't use degrees. Use reference points to verify reasonableness.
The converter assumes standard atmospheric pressure. Some specialized scales (Rankine, Réaumur) are not included. Very extreme temperatures may require scientific notation.
To convert Celsius to Fahrenheit, use the formula: F = (C × 9/5) + 32. For example, 25°C × 9/5 = 45, then 45 + 32 = 77°F. To convert Fahrenheit to Celsius: C = (F - 32) × 5/9. For example, 77°F - 32 = 45, then 45 × 5/9 = 25°C. Our converter does this instantly.
Kelvin (K) is the SI base unit of temperature used in science. It starts at absolute zero (-273.15°C), the theoretical lowest possible temperature. Unlike Celsius and Fahrenheit, Kelvin doesn't use degrees. Use Kelvin for: scientific calculations, thermodynamics, physics equations, and absolute temperature measurements. Conversion: K = C + 273.15.
Important reference temperatures: Water freezes at 0°C (32°F, 273.15K), Water boils at 100°C (212°F, 373.15K), Room temperature is 20-22°C (68-72°F, 293-295K), Normal body temperature is 37°C (98.6°F, 310.15K), Absolute zero is -273.15°C (-459.67°F, 0K). These help estimate conversions without a calculator.
Common oven temperature conversions: 150°C = 300°F (slow oven), 180°C = 350°F (moderate oven), 200°C = 400°F (hot oven), 220°C = 425°F (very hot oven), 250°C = 480°F (extremely hot). Note that some ovens use gas marks (1-9) which are primarily used in the UK.
Celsius is used by most countries worldwide and in science because it's based on water's properties (0°C freezing, 100°C boiling). Fahrenheit is primarily used in the United States for weather and cooking. It was designed so that 0°F was the coldest temperature achievable with ice and salt, and 100°F was approximately body temperature. Kelvin is used universally in scientific contexts.
For a quick mental estimate: Double the Celsius temperature and add 30. Example: 20°C × 2 = 40, then 40 + 30 = 70°F (actual: 68°F). For Fahrenheit to Celsius: Subtract 30 and divide by 2. Example: 70°F - 30 = 40, then 40 ÷ 2 = 20°C (actual: 21.1°C). This gives approximate results suitable for weather and everyday use.
Absolute zero is 0 Kelvin (-273.15°C or -459.67°F), the theoretical temperature at which all molecular motion stops. It's the lowest possible temperature in the universe. While scientists have achieved temperatures within billionths of a degree of absolute zero, reaching absolute zero itself is impossible according to the third law of thermodynamics.
Yes, our converter handles all temperature ranges including negative values. Negative Celsius and Fahrenheit temperatures are common in winter weather. Note that while Celsius and Fahrenheit can be negative, Kelvin cannot (it starts at 0). Very low negative temperatures are used in cryogenics, space research, and certain industrial processes.