Temperature Converter

1.1 Enter a value in any temperature field:

• Celsius (°C)
• Fahrenheit (°F)
• Kelvin (K)
• Other Scale (Rankine, Réaumur, Delisle, Newton, Rømer)

1.2 Automatic Real-Time Conversion

• All other temperature units update automatically as you type.
• Switch the Other Scale dropdown at any time to see the value in different historical or thermodynamic scales.

1.3 Environmental Weather Conditions

• Adjust Wind Speed in km/h to calculate perceived wind chill.
• Adjust Humidity percentage to calculate the summer Heat Index.

1.4 Quick Presets & History

• Click any quick preset (Freezing, Room, Body, Boiling, Absolute Zero) for instant values.
• Review previous conversions in the conversion history section.
• Click Clear to reset all fields and calculations.

2.1 Celsius (°C)

Standard metric temperature scale based on the freezing (0°C) and boiling points (100°C) of water.

2.2 Fahrenheit (°F)

Commonly used in the United States. Formula: °F = (°C × 9/5) + 32.

2.3 Kelvin (K)

The SI base unit of thermodynamic temperature where 0 K is absolute zero (-273.15°C). Formula: K = °C + 273.15.

2.4 Rankine (°R)

The absolute thermodynamic scale counterpart to the Fahrenheit scale. Formula: °R = (°C + 273.15) × 1.8.

2.5 Réaumur (°Ré)

Historical scale where water freezes at 0°Ré and boils at 80°Ré. Formula: °Ré = °C × 0.8.

3.1 Wind Chill Index

Calculated for temperatures ≤ 10°C and wind speeds ≥ 4.8 km/h. Explains how moving air accelerates heat loss from exposed skin.

3.2 Heat Index (Humidex)

Combines air temperature and relative humidity for temperatures ≥ 27°C (80°F) to determine human-perceived equivalent temperature.

4.1 Scientific Research & Laboratory Experiments

Convert thermodynamic temperatures between Celsius and Kelvin for gas law calculations, chemical reactions, and physics problem sets.

4.2 Culinary & Baking Temperature Conversions

Quickly translate oven temperatures and recipe specifications between Fahrenheit and Celsius for domestic and international recipes.

4.3 Weather Forecasting & Outdoor Recreation

Calculate realistic 'feels like' temperatures factoring in wind chill for winter sports or heat index warnings for summer athletics.

4.4 HVAC & Thermal Engineering

Convert air conditioning, refrigeration, and furnace thermal loads across Rankine and standard industrial scales.

5.1 How do I convert Celsius to Fahrenheit manually?

Multiply the temperature in Celsius by 9/5 (or 1.8) and then add 32. For example, 20°C × 1.8 = 36 + 32 = 68°F.

5.2 What is Absolute Zero?

Absolute zero is the theoretical point where all molecular motion ceases. It is defined as 0 Kelvin, -273.15° Celsius, or -459.67° Fahrenheit.

5.3 How does wind speed change 'feels like' temperature?

Wind removes the thin insulating layer of warm air surrounding the human body. Faster wind speeds accelerate heat loss, making cold air feel significantly colder than thermometer readings indicate.

5.4 Is this temperature calculator accurate for scientific use?

Yes. All conversions utilize exact standard thermodynamic conversion constants and official National Weather Service algorithms for wind chill and heat index.