Celsius to Fahrenheit Converter
Quick Reference Conversions
°C to °F Conversion Table
This table shows common temperature conversions you’ll encounter in everyday life. Temperatures are rounded to one decimal place for practical use.
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -40°C | -40.0°F | Extremely cold (same value) |
| -30°C | -22.0°F | Severe winter conditions |
| -20°C | -4.0°F | Very cold winter day |
| -10°C | 14.0°F | Cold winter day |
| 0°C | 32.0°F | Freezing point of water |
| 5°C | 41.0°F | Chilly spring/autumn day |
| 10°C | 50.0°F | Cool day, light jacket needed |
| 15°C | 59.0°F | Mild day, comfortable |
| 20°C | 68.0°F | Room temperature, pleasant |
| 25°C | 77.0°F | Warm summer day |
| 30°C | 86.0°F | Hot summer day |
| 35°C | 95.0°F | Very hot, heat warning |
| 37°C | 98.6°F | Normal body temperature |
| 40°C | 104.0°F | Extreme heat |
| 100°C | 212.0°F | Boiling point of water |
Conversion Formula & Steps
Alternatively, you can use: °F = (°C × 1.8) + 32
How to Convert Celsius to Fahrenheit
- Multiply the Celsius temperature by 9/5 (or 1.8) — This adjusts for the different scale intervals.
- Add 32 to the result — This accounts for the different zero points on each scale.
- Round if needed — Most practical applications need only one decimal place.
Worked Example
Let’s convert 21°C (typical room temperature) to Fahrenheit:
- Start with 21°C
- Multiply by 1.8: 21 × 1.8 = 37.8
- Add 32: 37.8 + 32 = 69.8°F
So 21°C equals approximately 70°F.
For Fahrenheit to Celsius conversion, use this formula instead.
Temperature Scales Compared
Celsius Scale
- Water freezes: 0°C
- Water boils: 100°C
- Absolute zero: -273.15°C
- Used in: UK, Europe, most countries
- Also called: Centigrade
Fahrenheit Scale
- Water freezes: 32°F
- Water boils: 212°F
- Absolute zero: -459.67°F
- Used in: USA, some Caribbean nations
- Named after: Daniel Gabriel Fahrenheit
Temperature in British Context
The UK officially switched from Fahrenheit to Celsius in the 1970s as part of metrication. Most Britons under 60 think exclusively in Celsius for weather and cooking.
You’ll still encounter Fahrenheit in older recipe books and when chatting with grandparents. Some tabloids use Fahrenheit during heatwaves because “90°F” sounds more dramatic than “32°C”.
British homes typically maintain 18-21°C in living rooms and 16-18°C in bedrooms. Weather forecasts, thermostats, and medical thermometers all display Celsius as standard.
Common UK Temperature References
- Below 0°C: Frost and ice expected, gritters out
- 5-10°C: Autumn weather, jumper needed
- 15°C: Mild day, light jacket optional
- 20-25°C: Lovely summer day, parks full
- 30°C+: Proper hot, tabloids go mad
Everyday Temperature Conversions
These are the temperature conversions you’ll actually use in daily British life, from weather watching to cooking Sunday roast.
Weather Temperatures
| °C | °F | What to Expect |
|---|---|---|
| -5°C | 23°F | Icy pavements, scraping car windscreens |
| 0°C | 32°F | Water freezes, potential snow |
| 12°C | 54°F | Light coat weather |
| 18°C | 64°F | Pleasant day, no jacket needed |
| 25°C | 77°F | Beach weather, ice cream sales soar |
| 32°C | 90°F | Official heatwave territory |
Cooking Temperatures
| °C | °F | Oven Setting |
|---|---|---|
| 140°C | 284°F | Low/slow cooking |
| 160°C | 320°F | Moderate oven |
| 180°C | 356°F | Standard baking temperature |
| 200°C | 392°F | Hot oven, roasting |
| 220°C | 428°F | Very hot, pizza oven |
Related Temperature Conversions
Need to convert other temperature scales? Here are the most common temperature unit conversions you might need.
FAQs
Why do we use Celsius in the UK?
The UK adopted Celsius in the 1970s as part of metrication. Celsius aligns with the metric system used across Europe and most of the world. It’s based on water’s freezing (0°C) and boiling (100°C) points at sea level, making it intuitive for scientific and everyday use.
Is 0 degrees Celsius the same as 0 degrees Fahrenheit?
No, they’re completely different. Water freezes at 0°C but at 32°F. The temperature where both scales show the same value is -40°, which is why -40°C equals -40°F.
Why does America still use Fahrenheit?
The United States retains Fahrenheit primarily due to tradition and the massive cost of switching. American infrastructure, manufacturing, and everyday life are built around Fahrenheit. Educational systems, weather services, and consumer products would all need updating.
What’s a quick way to estimate Celsius to Fahrenheit?
Double the Celsius temperature and add 30. This gives you a rough Fahrenheit estimate. For example, 20°C doubled is 40, plus 30 equals 70°F (actual: 68°F). It’s not exact but works well for quick mental maths.
At what temperature are Celsius and Fahrenheit equal?
The two scales meet at -40 degrees. At this point, -40°C equals -40°F exactly. This is the only temperature where both scales show identical numerical values.
Do British ovens use Celsius or Fahrenheit?
Modern British ovens display Celsius as standard. Some older models or imported American recipes might show Fahrenheit, but Celsius is now universal in UK kitchens. Most newer ovens include both scales for convenience.
What’s the difference between Celsius and Centigrade?
They’re the same thing. The scale was originally called Centigrade (meaning “hundred steps”) but was officially renamed Celsius in 1948 after Swedish astronomer Anders Celsius who designed it.
Why does Fahrenheit have 180 degrees between freezing and boiling?
Daniel Gabriel Fahrenheit designed his scale in 1724 before Celsius. He set 0°F as the freezing point of brine (salt water) and 96°F as human body temperature. This resulted in water freezing at 32°F and boiling at 212°F—a 180-degree span.
Is normal body temperature 37°C or 98.6°F?
Both are correct—they’re the same temperature. Normal body temperature is 37°C (98.6°F), though it varies slightly throughout the day and between individuals. Recent studies suggest the average may actually be slightly lower.
How accurate does temperature conversion need to be?
For weather and cooking, rounding to the nearest whole degree is fine. Scientific work requires more precision. Most everyday situations need accuracy within 1-2 degrees, which simple rounding provides.