Free Temperature Converter Online

Comprehensive Guide to Temperature Conversions

Temperature measures the average kinetic energy of molecules in a system. To quantify this energy, three primary scales are used globally:

1. Celsius (°C): Used in almost all countries for weather and daily temperature readouts, based on the freezing point (0°C) and boiling point (100°C) of water.
2. Fahrenheit (°F): Used mainly in the United States and territories, where water freezes at 32°F and boils at 212°F.
3. Kelvin (K): Used primarily in thermodynamic science, where 0 Kelvin represents Absolute Zero (equal to -273.15°C).

Non-Linear Temperature Formulas

Unlike distance or weight conversions which use simple multipliers, temperature conversions require offset adjustments:

1. Converting Celsius

• Celsius to Fahrenheit: $$T_{\text{Fahrenheit}} = \left( T_{\text{Celsius}} \times \frac{9}{5} \right) + 32$$
• Celsius to Kelvin: $$T_{\text{Kelvin}} = T_{\text{Celsius}} + 273.15$$

2. Converting Fahrenheit

• Fahrenheit to Celsius: $$T_{\text{Celsius}} = \left( T_{\text{Fahrenheit}} - 32 \right) \times \frac{5}{9}$$
• Fahrenheit to Kelvin: $$T_{\text{Kelvin}} = \left( (T_{\text{Fahrenheit}} - 32) \times \frac{5}{9} \right) + 273.15$$

3. Converting Kelvin

• Kelvin to Celsius: $$T_{\text{Celsius}} = T_{\text{Kelvin}} - 273.15$$
• Kelvin to Fahrenheit: $$T_{\text{Fahrenheit}} = \left( (T_{\text{Kelvin}} - 273.15) \times \frac{9}{5} \right) + 32$$

Step-by-Step Example Calculation

Suppose you want to convert room temperature of 68°F into Celsius:

1. Apply the Fahrenheit to Celsius equation: $$T_{\text{Celsius}} = (68 - 32) \times \frac{5}{9}$$
2. Subtract 32: $$68 - 32 = 36$$
3. Multiply by 5/9: $$36 \times 0.555555… = 20$$
4. Conclusion: A temperature of 68°F is exactly 20°C.