How do I convert Celsius to Fahrenheit (°C to °F)?
Multiply the Celsius temperature by 9/5 (or 1.8) and add 32. Formula: °F = (°C × 1.8) + 32. Example: 25°C × 1.8 + 32 = 77°F.
Temperature Converter (°C, °F, K, °R)
Instantly convert between Celsius, Fahrenheit, Kelvin, and Rankine with live calculation formulas and reference charts.
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Celsius to Fahrenheit(°C × 9/5) + 32 = °F
Live example
20 × 9/5 + 32 = 68 °FExplore the scaleRoom temperature
Celsius20°C
Fahrenheit68°F
Kelvin293.15K
What can the Temperature Converter (°C, °F, K, °R) do?
Convert temperatures accurately across Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) scales with live formula demonstrations, scientific definitions, and everyday temperature reference benchmarks (boiling point, room temperature, body heat, freezing point, and absolute zero).
- Bidirectional conversion between Celsius, Fahrenheit, Kelvin, and Rankine
- Live dynamic temperature calculation updated with every keystroke
- Step-by-step mathematical conversion formulas for physics and chemistry
- Interactive visual benchmark thermometer and landmark guide
- 100% client-side calculation with instant local responsiveness
How to use the Temperature Converter (°C, °F, K, °R)
- 1
Enter the numeric temperature value in the input field.
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Select your source temperature scale (°C, °F, K, or °R).
- 3
Choose the target unit or examine all four converted scales simultaneously.
- 4
Review the step-by-step formula breakdown below the converter.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius (°F to °C)?
Subtract 32 from Fahrenheit and multiply by 5/9. Formula: °C = (°F − 32) × (5/9). Example: (77°F − 32) × (5/9) = 25°C.
What is Absolute Zero in Celsius, Fahrenheit, and Kelvin?
Absolute Zero is 0 K (Kelvin), which corresponds to −273.15°C and −459.67°F. At this temperature, thermodynamic particle motion reaches its minimum.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are identical at exactly −40° (−40°C = −40°F).