Celsius to Fahrenheit Converter — Instant Temperature Conversion
Convert temperatures between Celsius and Fahrenheit instantly — type in either field and get the result immediately. Also shows Kelvin and Rankine for scientific use. Works for any temperature from absolute zero upwards.
Used for cooking, weather, travel, science, and medicine. Whether you need to convert body temperature, oven settings, or weather forecasts, this tool gives instant accurate results.
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Celsius (°C) is the standard temperature scale used in most countries and all scientific contexts. Fahrenheit (°F) is used primarily in the United States for weather, cooking, and everyday measurements.
°C to °F: Multiply by 9/5, then add 32 · (°C × 1.8) + 32 °F to °C: Subtract 32, then multiply by 5/9 · (°F − 32) ÷ 1.8
Common temperature conversions
−40°C = −40°F (the only point where both scales are equal)
0°C = 32°F (water freezes) · 20°C = 68°F (room temperature)
37°C = 98.6°F (body temperature) · 100°C = 212°F (water boils)
180°C = 356°F (moderate oven) · 220°C = 428°F (hot oven)
Kelvin — the scientific scale
Kelvin (K) is used in physics and chemistry. It starts at absolute zero (−273.15°C), the coldest theoretically possible temperature. To convert °C to Kelvin: add 273.15. There are no negative Kelvin values.
In everyday life, Celsius is used for weather in Europe, Asia, Africa, and Australia, while Americans commonly reference Fahrenheit. When travelling internationally, this converter is essential for understanding local weather forecasts, cooking recipes, and medical readings.
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
Multiply the Celsius value by 1.8 (or 9/5), then add 32. Formula: °F = (°C × 1.8) + 32. Example: 25°C × 1.8 = 45 + 32 = 77°F.
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9 (or divide by 1.8). Formula: °C = (°F − 32) ÷ 1.8. Example: (98.6°F − 32) ÷ 1.8 = 37°C (body temperature).
At what temperature is Celsius equal to Fahrenheit?
Celsius and Fahrenheit are equal at −40°. This is the only point where both scales intersect. You can verify: (−40 × 1.8) + 32 = −72 + 32 = −40°F.
What is normal body temperature in Celsius and Fahrenheit?
Normal human body temperature is 37°C or 98.6°F. A fever is generally defined as a body temperature above 38°C (100.4°F). Hypothermia occurs when body temperature drops below 35°C (95°F).
What is Kelvin and how does it relate to Celsius?
Kelvin is the SI base unit of temperature, used in science and engineering. 0 K (absolute zero) is the lowest possible temperature. To convert: K = °C + 273.15. So 0°C = 273.15 K and 100°C = 373.15 K.