Celsius to Fahrenheit Converter
Convert any temperature from Celsius to Fahrenheit and Kelvin.
How to use this celsius to fahrenheit
- 1Enter the temperature in Celsius.
- 2The converter shows Fahrenheit and Kelvin instantly.
- 3For weather, key reference points: 0°C = 32°F (freezing), 20°C = 68°F (comfortable room temperature), 37°C = 98.6°F (body temperature), 100°C = 212°F (boiling).
- 4For cooking, oven temperatures in Celsius convert directly to Fahrenheit: 180°C = 356°F, 200°C = 392°F.
- 5For science and physics, the Kelvin output is automatically calculated.
- 6Mental shortcut: multiply °C by 2 and add 30 for a rough °F estimate (works well between 0–40°C).
How it's calculated
°F = (°C × 9/5) + 32. K = °C + 273.15.
About the Celsius to Fahrenheit
Celsius and Fahrenheit are two temperature scales in use today, with the Celsius scale used by virtually all scientific contexts and most of the world for everyday weather and temperature measurement, while Fahrenheit is primarily used in the United States for daily weather reports, cooking, and body temperature.
The conversion formula is °F = (°C × 9/5) + 32. This can be rearranged to °C = (°F − 32) × 5/9. The formula has two steps: multiply by 9/5 (or 1.8) to account for the different scale size, then add 32 to account for the different zero points. Celsius defines 0° as the freezing point of water and 100° as the boiling point at sea level; Fahrenheit defines 32° as freezing and 212° as boiling — a 180° range vs Celsius's 100° range.
Weather is the most frequent practical context for Celsius-to-Fahrenheit conversion. The US is nearly alone in reporting daily temperatures in Fahrenheit; every other country reports in Celsius. A US traveler in Europe sees a forecast for 22°C and needs to know whether to pack a jacket (comfortable, no). Someone in the US trying to understand an international news story about a heat wave at 42°C needs to convert to understand the severity (108°F — dangerously hot). The key reference points for weather: 0°C = 32°F (freezing), 10°C = 50°F (cold), 20°C = 68°F (pleasant), 30°C = 86°F (warm), 40°C = 104°F (hot).
Cooking creates a constant need for temperature conversion. Most recipes worldwide are written for one or the other system, and ovens in different countries may be calibrated in different scales. European recipes specify temperatures in Celsius; American recipes use Fahrenheit. The key cooking benchmarks: 180°C = 356°F (standard baking for cakes, cookies), 200°C = 392°F (roasting vegetables, chicken), 220°C = 428°F (pizza, bread). Most ovens allow setting in both scales, but knowing the conversion prevents errors when following international recipes.
Medical temperature references are an important practical category. Normal body temperature is 37°C = 98.6°F; a fever is generally defined as above 38°C (100.4°F) in most medical guidelines. Hypothermia begins below 35°C (95°F). US medical contexts often use Fahrenheit (patient's temperature is "101.2"), while international and clinical research uses Celsius. Understanding the conversion helps patients and caregivers interpret medical information from different sources.
Frequently asked questions
What is 37°C in Fahrenheit?
37°C × 9/5 + 32 = 98.6°F — the standard normal human body temperature. A fever is typically considered above 38°C (100.4°F).
What temperature is the same in both Celsius and Fahrenheit?
−40° is exactly the same in both scales. This is the point where the two temperature lines intersect: −40°C = −40°F.
What are common oven temperatures in Celsius and Fahrenheit?
150°C = 302°F (low/slow), 175°C = 347°F (moderate), 180°C = 356°F (standard baking), 200°C = 392°F (hot), 220°C = 428°F (very hot), 250°C = 482°F (maximum most ovens). Most recipes round to: 180°C = 350°F, 200°C = 400°F, 230°C = 450°F.
Why does the US use Fahrenheit while most countries use Celsius?
Fahrenheit was the dominant temperature scale in science until the mid-20th century and was adopted early in the US. As other countries metricated their measurement systems (typically in the 1960s–1980s), they switched to Celsius. The US metrication effort largely stalled, and the cultural familiarity with Fahrenheit was retained. For science, medicine, and engineering, Celsius (or Kelvin) is used universally even in the US.
What is a comfortable room temperature in both scales?
Most people find 20–22°C (68–72°F) comfortable indoors. Air conditioning systems in the US are typically set to 68–72°F; in metric countries, the equivalent 20–22°C is the standard. Outdoor comfortable weather is considered 18–24°C (64–75°F) by most weather services.