Celsius to Fahrenheit Converter
Updated on September 29, 2026
Brighterly’s free temperature converter turns Celsius into Fahrenheit and Fahrenheit into Celsius in one click. Type a temperature, press Convert, and get the answer in seconds with full explanation.
Below the tool you’ll find the exact formulas, a full °C to °F chart, popular conversions like 22 °C, 180 °C, and 70 °F, and quick tricks for estimating temperatures in your head. Students can use it to check homework, and parents can use it for recipes, weather, and travel.
Enter a temperature in Celsius to convert it to Fahrenheit.
Step-by-Step Solution
Common Temperatures
| What | Celsius | Fahrenheit |
|---|---|---|
| Water boils | 100 °C | 212 °F |
| Body temperature | 37 °C | 98.6 °F |
| Room temperature | 20 °C | 68 °F |
| Water freezes | 0 °C | 32 °F |
| Very cold day | −18 °C | 0 °F |
Temperature Problems Getting Tricky?
A free math assessment shows where your child needs support in just a few minutes. Grades 1–10.
How to Use the Celsius to Fahrenheit Converter
- Pick a direction. Select Celsius → Fahrenheit to convert °C to °F, or Fahrenheit → Celsius to convert °F to °C.
- Enter the temperature. Type your number in the input field. Whole numbers and decimals both work.
- Click Convert. The converted temperature appears right away.
- Check it against the table. Compare your result with the Common Temperatures table. If you converted 100 °C, you should see 212 °F.
- Switch tabs to double-check. Convert your answer back. If 22 °C gives 71.6 °F, then 71.6 °F should give 22 °C.
💡 Pro tip: You can use the converter to practice. Estimate the answer in your head first, then press Convert to see how close you got.
How to Convert Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply the temperature by 9/5 (or 1.8), then add 32.
| °F = (°C × 9/5) + 32 | Multiply by 1.8, then add 32. |
|---|
Steps:
- Multiply the Celsius temperature by 9/5 (or 1.8).
- Add 32 to the result.
- Write the answer with the °F symbol.
Example: convert 22 °C to °F. 22 × 1.8 = 39.6, and 39.6 + 32 = 71.6 °F.
Example: convert 100 °C to °F. 100 × 1.8 = 180, and 180 + 32 = 212 °F.
Example: convert 0 °C to °F. 0 × 1.8 = 0, and 0 + 32 = 32 °F.
Why 9/5 and 32? Between freezing and boiling, the Celsius scale has 100 degrees while the Fahrenheit scale has 180 (from 32 °F to 212 °F). That gives a ratio of 180/100, which simplifies to 9/5. The +32 shifts the starting point, because water freezes at 0 °C but at 32 °F. If fractions feel rusty, try our fraction calculator to practice working with 9/5.
How to Convert Fahrenheit to Celsius
To convert Fahrenheit to Celsius, subtract 32, then multiply by 5/9.
| °C = (°F − 32) × 5/9 | Subtract 32 first, then multiply by 5/9. |
|---|
Steps:
- Subtract 32 from the Fahrenheit temperature.
- Multiply the result by 5/9 (or divide by 1.8).
- Round if needed and write the answer with the °C symbol. Our rounding calculator can help with that step.
Example: convert 70 °F to °C. 70 − 32 = 38, and 38 × 5/9 = 21.1 °C.
Example: convert 32 °F to °C. 32 − 32 = 0, and 0 × 5/9 = 0 °C.
Example: convert 100 °F to °C. 100 − 32 = 68, and 68 × 5/9 = 37.8 °C.
The order matters. Subtract first, then multiply. Multiplying first gives the wrong answer.
Celsius to Fahrenheit Chart (°C to °F)
Use this chart for a quick lookup without the calculator. Values are rounded to one decimal place.
| °C | °F | °C | °F | °C | °F |
|---|---|---|---|---|---|
| −40 | −40 | 16 | 60.8 | 30 | 86 |
| −18 | −0.4 | 18 | 64.4 | 32 | 89.6 |
| −10 | 14 | 20 | 68 | 34 | 93.2 |
| 0 | 32 | 21 | 69.8 | 36 | 96.8 |
| 4 | 39.2 | 22 | 71.6 | 37 | 98.6 |
| 5 | 41 | 23 | 73.4 | 40 | 104 |
| 6 | 42.8 | 25 | 77 | 45 | 113 |
| 8 | 46.4 | 26 | 78.8 | 50 | 122 |
| 10 | 50 | 28 | 82.4 | 60 | 140 |
| 12 | 53.6 | 15 | 59 | 100 | 212 |
Fahrenheit to Celsius Chart (°F to °C)
| °F | °C | °F | °C |
|---|---|---|---|
| 0 | −17.8 | 70 | 21.1 |
| 10 | −12.2 | 80 | 26.7 |
| 25 | −3.9 | 90 | 32.2 |
| 32 | 0 | 98.6 | 37 |
| 40 | 4.4 | 100 | 37.8 |
| 50 | 10 | 104 | 40 |
| 60 | 15.6 | 212 | 100 |
Popular Celsius to Fahrenheit Conversions
These are the temperatures people search for most. Each answer is exact, and you can check it with the converter above.
22 Celsius to Fahrenheit
22 °C = 71.6 °F. This is a comfortable indoor temperature and a pleasant spring day.
21 Celsius to Fahrenheit
21 °C = 69.8 °F, which is close to 70 °F. It is a standard target for room temperature.
16 Celsius to Fahrenheit
16 °C = 60.8 °F. Expect a cool morning or a light-jacket day.
23 Celsius to Fahrenheit
23 °C = 73.4 °F. It feels mild and warm without being hot.
28 Celsius to Fahrenheit
28 °C = 82.4 °F. This is a warm summer afternoon.
40 Celsius to Fahrenheit
40 °C = 104 °F. That is dangerous heat, so drink plenty of water and avoid long stretches outside.
60 Celsius to Fahrenheit
60 °C = 140 °F. Water at this temperature can scald skin in seconds.
100 Celsius to Fahrenheit
100 °C = 212 °F, the boiling point of water at sea level.
0 Celsius to Fahrenheit
0 °C = 32 °F, the freezing point of water.
180 Celsius to Fahrenheit (Oven Temperature)
180 °C = 356 °F. Recipes from outside the US often say 180 °C, and US recipes usually round it to 350 °F.
| Oven (°C) | Oven (°F, exact) | Common US setting |
|---|---|---|
| 150 °C | 302 °F | 300 °F |
| 160 °C | 320 °F | 325 °F |
| 180 °C | 356 °F | 350 °F |
| 190 °C | 374 °F | 375 °F |
| 200 °C | 392 °F | 400 °F |
| 220 °C | 428 °F | 425 °F |
Popular Fahrenheit to Celsius Conversions
- 32 °F to Celsius: 0 °C. It is the freezing point of water.
- 50 °F to Celsius: 10 °C. It is cool, and you’ll want a jacket.
- 70 °F to Celsius: 21.1 °C. It is a comfortable room temperature.
- 80 °F to Celsius: 26.7 °C. It is warm and pleasant.
- 90 °F to Celsius: 32.2 °C. It is hot.
- 100 °F to Celsius: 37.8 °C. It is very hot weather, or a slightly raised body temperature.
Is It Hot or Cold? Temperature Guide
Numbers like 22 or 32 only mean something once you know which scale they are on. Use this guide to see how each temperature feels.
| °C | °F | How it feels |
|---|---|---|
| −18 °C | 0 °F | Very cold. Winter coat, hat, and gloves |
| 0 °C | 32 °F | Freezing |
| 10 °C | 50 °F | Cool. Jacket weather |
| 18 °C | 64 °F | Mild. Light sweater |
| 20–22 °C | 68–72 °F | Comfortable room temperature |
| 25 °C | 77 °F | Warm |
| 30 °C | 86 °F | Hot |
| 37 °C | 98.6 °F | Normal body temperature |
| 40 °C | 104 °F | Extreme heat |
This also answers a common confusion. 32 °C is hot (89.6 °F), but 32 °F is freezing (0 °C). The same number means very different things depending on the scale.
Body Temperature and Fever: °C and °F
Normal body temperature is about 37 °C (98.6 °F). Doctors generally consider a fever to start at 38 °C (100.4 °F). That means 100 °F (37.8 °C) is a slightly raised temperature and not yet a fever by that measure. For any health concern, especially with young children, check with a doctor.
Celsius vs. Fahrenheit: What’s the Difference?
Both scales measure temperature. They differ in where they start and how big one degree is.
| Celsius (°C) | Fahrenheit (°F) | |
|---|---|---|
| Water freezes | 0 °C | 32 °F |
| Water boils | 100 °C | 212 °F |
| Degrees between freezing and boiling | 100 | 180 |
| Size of one degree | Larger | Smaller (1 °C = 1.8 °F) |
| Where it’s used | Most of the world, and science | The United States and a few other countries |
- Celsius is based on water. Its 0 and 100 are the freezing and boiling points.
- Fahrenheit is finer-grained. Each degree is smaller, so weather forecasts can describe small changes without decimals.
- Centigrade is the older name for Celsius. “10 degrees centigrade” means 10 °C, or 50 °F.
- The two scales meet at −40, where −40 °C equals −40 °F.
Mental Math Tricks for Temperature Conversion
You won’t always have a calculator, so learn one quick estimate and one accurate method.
Quick estimate, Celsius to Fahrenheit: double it and add 30.
For 22 °C, 22 × 2 = 44, and 44 + 30 = 74 °F. The exact answer is 71.6 °F, so it is close enough for a weather check.
Quick estimate, Fahrenheit to Celsius: subtract 30 and halve it.
For 70 °F, 70 − 30 = 40, and half of 40 is 20 °C. The exact answer is 21.1 °C.
More accurate method, Celsius to Fahrenheit: double it, subtract 10% of that, then add 32.
For 22 °C, 44 − 4.4 = 39.6, and 39.6 + 32 = 71.6 °F. This one is exact.
The estimates drift further from the true value as temperatures get higher. For cooking, science labs, or health, use the converter.
Why Temperature Conversion Matters in School
Temperature comes up all through school math:
- Grade 6: Temperatures above and below zero are the classic real-world model for positive and negative numbers (CCSS 6.NS.C.5).
- Grades 6–7: Students evaluate and write expressions like C × 9/5 + 32, and work with fractions and decimals along the way.
- Grade 8 and up: °F = 9/5 × °C + 32 is a linear function. Its slope is 9/5 and its y-intercept is 32, which makes it a friendly first example in algebra.
If your child can use the formula but not explain it, a tutor can help. Brighterly’s middle school math tutors work 1:1, aligned to US state standards, and focus on the exact gap each student has.
Common Temperature Conversion Mistakes
| ❌ Common mistake | ✅ Fix |
|---|---|
| Adding 32 before multiplying (C → F) | Multiply by 1.8 first, then add 32 |
| Multiplying before subtracting (F → C) | Subtract 32 first, then multiply by 5/9 |
| Using 5/9 for C → F, or 9/5 for F → C | C → F uses 9/5. F → C uses 5/9. |
| Forgetting the sign on negative temperatures | Keep the minus sign through every step |
| Assuming the same number means the same heat | 32 °C is hot and 32 °F is freezing. Always check the unit. |
| Rounding too early | Keep the decimals until the last step |
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 1.8 (or 9/5), then add 32. For example, 22 °C × 1.8 = 39.6, and 39.6 + 32 = 71.6 °F. Or select Celsius → Fahrenheit in the converter above and enter your number.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, (80 − 32) × 5/9 = 26.7 °C. In the converter, switch to the Fahrenheit → Celsius tab.
What is 22 Celsius in Fahrenheit?
22 °C is 71.6 °F. That is a comfortable room temperature.
What is 180 Celsius in Fahrenheit?
180 °C is 356 °F. In US recipes it is usually written as 350 °F.
What is 32 Fahrenheit in Celsius?
32 °F is exactly 0 °C, the freezing point of water.
What is 100 Celsius in Fahrenheit?
100 °C is 212 °F, the boiling point of water at sea level.
Is 100 degrees Fahrenheit a fever?
Not quite. 100 °F equals 37.8 °C, which is slightly above normal body temperature (98.6 °F, or 37 °C). A fever is generally 100.4 °F (38 °C) or higher. Talk to a doctor if you are worried.
Is 32 degrees hot or cold?
It depends on the scale. 32 °C (89.6 °F) is hot. 32 °F (0 °C) is freezing.
At what temperature are Celsius and Fahrenheit equal?
At −40. Both −40 °C and −40 °F describe the same temperature. It is the only point where the two scales match.
What is the difference between Celsius and centigrade?
Nothing in practice. Centigrade was the older name for the Celsius scale, and “10 degrees centigrade” means the same as 10 °C.
What is normal room temperature in Celsius and Fahrenheit?
Room temperature is usually 20–22 °C, which is 68–72 °F.
Why does the United States use Fahrenheit?
Fahrenheit was widely used in the English-speaking world before the metric system spread, and the US never switched for everyday use. Most other countries, and science worldwide, use Celsius.
Convert Temperatures with Confidence
Whether you’re checking homework, adjusting a recipe, planning a trip, or reading a weather forecast, Brighterly’s Celsius to Fahrenheit converter gives you the answer in seconds. Use the charts and formulas above to understand it, too.
When the calculator isn’t enough and your child needs to really understand formulas, negative numbers, and functions, Brighterly’s online math tutors are ready. You can also explore our free math worksheets for extra practice.
Math & reading from 1st to 12th grade
Looking for homework support for your child?
Choose kid's grade
Math & Reading for Grades 1–12
Build real confidence for your child with a Brighterly math or reading tutor.
