Enter a temperature in either Celsius or Fahrenheit. The other field updates automatically. No data is sent anywhere.
About this temperature converter
Temperature is measured with different scales around the world. The most common are Celsius (°C) and Fahrenheit (°F). Celsius is used in most countries and in the scientific community for everyday reporting (weather, cooking, health, industry). It is historically linked to water at standard pressure: water freezes at 0°C and boils at 100°C. Fahrenheit is mainly used in the United States and a few other places. On that scale, water freezes at 32°F and boils at 212°F.
This free converter helps you switch instantly between °C and °F for common situations: checking international weather forecasts, following recipes written in another country, comparing lab values, or understanding temperature settings on devices. Type a value in one field and the other field updates automatically. The conversion is precise and uses the standard linear formulas.
The relationship between the two scales is based on a fixed ratio: one degree Celsius equals 1.8°F (that is 9/5). To convert from Celsius to Fahrenheit, multiply by 9/5 and add 32. To convert from Fahrenheit to Celsius, subtract 32 and multiply by 5/9. Because these are linear conversions, the tool works for negative values too (for example winter temperatures).
Privacy is a key principle of Universe Tools: all calculations run 100% locally in your browser. Your inputs are not uploaded, stored, or shared.
Tip: the exact same conversion applies whether you are converting room temperature, cooking temperatures, or outdoor weather values.
What is this tool for?
This converter instantly switches a temperature between Celsius (°C) and Fahrenheit (°F). It’s useful when you read weather forecasts, recipes, appliance settings, or international documentation that uses a different temperature scale. The calculation runs locally in your browser (no upload).
Concrete examples
- Room temperature: 20°C = 68°F.
- Body temperature (approx.): 37°C = 98.6°F.
- Freezing point of water: 0°C = 32°F.
- Hot summer day: 30°C = 86°F.
Common mistakes
- Forgetting the +32 offset when converting °C → °F.
- Using 1.8 without subtracting 32 when converting °F → °C.
- Confusing “degrees” with “percent” (the relationship is linear, not proportional to zero).
Limitations
This tool converts only between °C and °F. If you need Kelvin (K) for science/engineering contexts, use a dedicated Celsius ↔ Kelvin tool. Results are shown with two decimals, which is more than enough for everyday use (weather, cooking, home devices).
Educational summary
The standard formulas are: °F = (°C × 9/5) + 32 and °C = (°F − 32) × 5/9. This page computes everything locally and does not store your inputs.