Temperature Converter (Full): Celsius, Fahrenheit and Kelvin

This calculator converts temperatures between the three most widely used scales: Celsius (°C), Fahrenheit (°F) and Kelvin (K), essential in science, cooking and everyday life.

Conversion formulas

The relationships between scales are:

• Celsius to Fahrenheit: °F = °C × 9/5 + 32
• Fahrenheit to Celsius: °C = (°F − 32) × 5/9
• Celsius to Kelvin: K = °C + 273.15
• Fahrenheit to Kelvin: K = (°F − 32) × 5/9 + 273.15

Absolute zero is 0 K = −273.15 °C = −459.67 °F.

Example 1: body temperature

Problem: Convert 37 °C to Fahrenheit and Kelvin.

1. Fahrenheit:
   • °F = 37 × 9/5 + 32 = 66.6 + 32 = 98.6 °F.
2. Kelvin:
   • K = 37 + 273.15 = 310.15 K.

Answer: 37 °C = 98.6 °F = 310.15 K.

Example 2: water boiling point

Problem: Convert 100 °C to Fahrenheit and Kelvin.

1. Fahrenheit:
   • °F = 100 × 9/5 + 32 = 180 + 32 = 212 °F.
2. Kelvin:
   • K = 100 + 273.15 = 373.15 K.

Answer: 100 °C = 212 °F = 373.15 K.

Common uses of temperature conversion

• Converting cooking recipes between countries with different scales.
• Interpreting international weather data.
• Working with thermodynamic equations that require Kelvin.
• Calibrating temperature measurement instruments.
• Understanding technical specifications of equipment.
• Traveling and understanding weather forecasts in other countries.

Common mistakes with temperature

• Forgetting to add 32 when converting from Celsius to Fahrenheit.
• Using 273 instead of 273.15 for precise conversions.
• Confusing the direction of conversion.
• Not considering that Kelvin does not use the degree symbol (K, not °K).

Pro tip

For a quick °C to °F estimate: multiply by 2 and add 30. For example, 20 °C ≈ 20×2+30 = 70 °F (exact value is 68 °F). It is useful for a quick mental check.