°C to °F Converter
Convert Celsius temperatures into Fahrenheit values
Celsius to Fahrenheit FAQ
How do you convert Celsius to Fahrenheit exactly?
The standard formula is: °F = (°C × 9⁄5) + 32. First you multiply the Celsius temperature by 9/5, then you add 32. For example, 20 °C becomes (20 × 9/5) + 32 = 68 °F. This calculator applies that °C to °F formula for you and formats the result so it is easy to read and copy into homework, reports or notes.
Why do we add 32 in the formula?
The Celsius and Fahrenheit scales have different zero points. Water freezes at 0 °C but at 32 °F. Adding 32 after scaling the °C value shifts the result so that 0 °C lines up with 32 °F and 100 °C lines up with 212 °F. The 9/5 part adjusts for the fact that 100 degrees on the Celsius scale correspond to 180 degrees on the Fahrenheit scale.
What are some common °C to °F conversions?
A few useful reference points are:
- 0 °C = 32 °F (water freezes)
- 10 °C = 50 °F (cool day)
- 20 °C = 68 °F (comfortable room temperature)
- 25 °C = 77 °F (warm day)
- 30 °C = 86 °F (hot summer day)
- 37 °C ≈ 98.6 °F (normal body temperature)
The calculator uses the exact formula for any value you enter, including negative temperatures and decimals.
Can I use this for weather and travel planning?
Yes. If you normally think in Celsius but see forecasts in Fahrenheit while travelling to the US or to websites that use °F, a quick Celsius to Fahrenheit conversion helps you understand what the numbers actually feel like. You can plug in your preferred comfort range in °C and see the matching °F values for thermostats, car displays and local weather apps.
Is this suitable for oven temperatures and cooking?
Definitely. Many European or international recipes use °C for oven settings, while US ovens are marked in °F. This tool lets you convert °C recipe temperatures into °F dial settings quickly. Remember that real ovens can be a little off, so it is still useful to keep an oven thermometer if you bake a lot, but the converter gives you the correct target figure to aim for.
Does this work for science, HVAC and lab calculations?
Yes. The Celsius and Fahrenheit scales are both linear, so the same (°C × 9/5) + 32 relationship applies across everyday and scientific ranges. For absolute temperature calculations in physics and engineering, you may still need to convert to Kelvin using K = °C + 273.15, or use a dedicated Kelvin converter for those problems.
How many decimal places of °F do I need?
For weather, comfort and cooking, whole degrees or one decimal place are usually enough. For example, 23 °C is often rounded to 73 °F. In more technical work you may want more digits, but the key is to match the precision of your instruments and requirements. The calculator keeps full precision internally and then presents a tidy, readable value.
From familiar Celsius readings to Fahrenheit numbers
This °C to °F converter is made for the situations where you think in Celsius but need to communicate or work in Fahrenheit. That might be emailing someone in the US about heat waves, adjusting a thermostat that only shows °F, or reading an HVAC or appliance manual written for the US market. Instead of memorising the formula every time, you type the Celsius temperature, tap convert, and get a clear line such as “25 °C = 77 °F”.
1. Single Celsius box, single Fahrenheit result
The interface stays deliberately minimal: one input for °C and a result card below. You can type whole numbers like 18 °C for room temperature, or decimals such as 37.5 °C for body temperature or lab values. The converter applies the exact (°C × 9/5) + 32 formula behind the scenes and formats the result so it is easy to read on phones, tablets and desktop screens.
If you later need the reverse direction, from °F back to °C, the “Swap Units” button takes you straight to the dedicated Fahrenheit to Celsius page so you can move between both directions without changing tools or layout.
2. Linear relationship between °C and °F
The Celsius and Fahrenheit scales are both linear, defined by the freezing and boiling points of water at standard pressure. Celsius sets these at 0 °C and 100 °C, while Fahrenheit uses 32 °F and 212 °F. The 100-degree span on the Celsius scale matches 180 degrees on the Fahrenheit scale, which leads to the 9/5 factor in the formula. Adding 32 realigns the zero points. This converter relies on that exact linear relationship so your results match scientific calculators, textbooks and standards documents.
When you need to move beyond Celsius and Fahrenheit to Kelvin or other scales, the temperature conversion calculator lets you link multiple temperature units in a single place.
3. Common °C to °F values at a glance
Here are some example conversions that match what the calculator produces. They are helpful for building intuition or quickly checking numbers in your head:
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 35 °C | 95 °F |
| 40 °C | 104 °F |
| 100 °C | 212 °F |
A quick mental rule is to double the °C value and add 30. For example, 20 °C → about 70 °F (the exact answer is 68 °F). That shortcut is fine for rough estimates. When you need an accurate value for planning, cooking or technical work, the converter gives you the precise result with the proper formula.
4. Where the °C to °F converter shines
You will most often use this tool in scenarios like:
- Weather and travel — translate Celsius temperatures from your local forecast into Fahrenheit values for thermostats and US discussions.
- Cooking and baking — convert °C oven temperatures in recipes to °F dial settings on US ovens.
- HVAC and building work — align set points, comfort ranges and specification sheets that mix °C and °F.
- Science, engineering and homework — handle textbook problems or lab notes that require Fahrenheit outputs.
- Everyday comparisons — quickly see what “a 25 °C day” or “a 4 °C fridge” look like in Fahrenheit for friends or colleagues.
Because it is grounded in the official linear relationship between the two temperature scales, you can return to this Celsius to Fahrenheit converter at any time and get consistent, predictable results that work for everyday life and more technical applications.
References and further reading on Celsius and Fahrenheit
These references explain how the Celsius and Fahrenheit scales are defined and used:
- Celsius — describes the Celsius scale, its history and connection to Kelvin.
- Fahrenheit — covers the Fahrenheit scale, its fixed points and common usage.
- SI Units — Temperature (NIST) — gives official background on temperature units and the Kelvin/Celsius relationship.
For scientific, industrial or regulatory work, always follow your organisation’s official conversion and rounding rules when moving between Celsius, Fahrenheit and Kelvin.