Celsius to Fahrenheit Converter (°C to °F, C to F) – Formula, Chart & Examples
Last updated: February 28, 2026
[°F] = [°C] × 9⁄5 + 32
Convert any Celsius value to Fahrenheit using the standard thermodynamic relation between these two scales.
How to convert from Celsius to Fahrenheit
It is easy to convert a temperature value from Celsius to Fahrenheit by using the formula below:
[°F] = [°C] × 9⁄5 + 32
or
Value in Fahrenheit = Value in Celsius × 9⁄5 + 32
To change 0° Celsius to Fahrenheit, just need to replace the value [°C] in the formula below and then do the math.
Step-by-step Solution:
-
Write down the formula: [°F] = [°C] × 9⁄5 + 32
-
Plug the value in the formula: 0 × 9⁄5 + 32
-
Multiply by 9: 0⁄5 + 32
-
Divide by 5: 0 + 32
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Add 32: 32 (answer)
Quick Mental Math Shortcut
No calculator? Multiply the Celsius value by 2 and add 30 for a rough estimate.
°F ≈ °C × 2 + 30
Example: 25 °C × 2 + 30 = 80 °F (actual: 77 °F). This shortcut works well for everyday temperatures between 0 °C and 40 °C, with an error of just a few degrees.
Key Reference Temperatures
| °C | °F | Significance |
|---|---|---|
| -40 | -40.0 | Celsius/Fahrenheit intersection |
| -18 | 0.0 | Zero Fahrenheit |
| 0 | 32.0 | Freezing point of water |
| 10 | 50.0 | Cool day |
| 20 | 68.0 | Room temperature |
| 37 | 98.6 | Body temperature |
| 40 | 104.0 | High fever / hot day |
| 100 | 212.0 | Boiling point of water |
| 150 | 302.0 | Low oven |
| 180 | 356.0 | Moderate oven (baking) |
| 200 | 392.0 | Hot oven (roasting) |
| 220 | 428.0 | Very hot oven (pizza) |
Celsius to Fahrenheit Conversion Table (1–100 °C)
| Celsius | Fahrenheit | Celsius | Fahrenheit |
|---|---|---|---|
| 1 | 33.8 | 2 | 35.6 |
| 3 | 37.4 | 4 | 39.2 |
| 5 | 41.0 | 6 | 42.8 |
| 7 | 44.6 | 8 | 46.4 |
| 9 | 48.2 | 10 | 50.0 Cool day |
| 11 | 51.8 | 12 | 53.6 |
| 13 | 55.4 | 14 | 57.2 |
| 15 | 59.0 | 16 | 60.8 |
| 17 | 62.6 | 18 | 64.4 |
| 19 | 66.2 | 20 | 68.0 Room temperature |
| 21 | 69.8 | 22 | 71.6 Comfortable indoor |
| 23 | 73.4 | 24 | 75.2 |
| 25 | 77.0 | 26 | 78.8 |
| 27 | 80.6 | 28 | 82.4 |
| 29 | 84.2 | 30 | 86.0 |
| 31 | 87.8 | 32 | 89.6 |
| 33 | 91.4 | 34 | 93.2 |
| 35 | 95.0 | 36 | 96.8 |
| 37 | 98.6 Body temperature | 38 | 100.4 Fever threshold (CDC) |
| 39 | 102.2 | 40 | 104.0 High fever |
| 41 | 105.8 | 42 | 107.6 |
| 43 | 109.4 | 44 | 111.2 |
| 45 | 113.0 | 46 | 114.8 |
| 47 | 116.6 | 48 | 118.4 |
| 49 | 120.2 | 50 | 122.0 |
| 51 | 123.8 | 52 | 125.6 |
| 53 | 127.4 | 54 | 129.2 |
| 55 | 131.0 | 56 | 132.8 |
| 57 | 134.6 | 58 | 136.4 |
| 59 | 138.2 | 60 | 140.0 |
| 61 | 141.8 | 62 | 143.6 |
| 63 | 145.4 | 64 | 147.2 |
| 65 | 149.0 | 66 | 150.8 |
| 67 | 152.6 | 68 | 154.4 |
| 69 | 156.2 | 70 | 158.0 |
| 71 | 159.8 | 72 | 161.6 |
| 73 | 163.4 | 74 | 165.2 |
| 75 | 167.0 | 76 | 168.8 |
| 77 | 170.6 | 78 | 172.4 |
| 79 | 174.2 | 80 | 176.0 |
| 81 | 177.8 | 82 | 179.6 |
| 83 | 181.4 | 84 | 183.2 |
| 85 | 185.0 | 86 | 186.8 |
| 87 | 188.6 | 88 | 190.4 |
| 89 | 192.2 | 90 | 194.0 |
| 91 | 195.8 | 92 | 197.6 |
| 93 | 199.4 | 94 | 201.2 |
| 95 | 203.0 | 96 | 204.8 |
| 97 | 206.6 | 98 | 208.4 |
| 99 | 210.2 | 100 | 212.0 Boiling point |
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius value by 9/5 (or 1.8) and then add 32. For example, 100 °C × 9/5 + 32 = 212 °F.
What is the formula for °C to °F?
The formula is: °F = °C × 9/5 + 32. This can also be written as °F = °C × 1.8 + 32.
What is absolute zero in Celsius?
Absolute zero is -273.15 °C, which equals -459.67 °F or 0 Kelvin. It is the lowest possible temperature: a system there holds its minimum thermal energy, although quantum zero-point motion never stops completely.
Why is Fahrenheit different from Celsius?
Fahrenheit and Celsius use different reference points and scale divisions. Celsius sets 0° at the freezing point and 100° at the boiling point of water. Fahrenheit sets 32° at the freezing point and 212° at the boiling point, resulting in 180 divisions between the two references compared to 100 in Celsius.
Is 37 °C a fever?
No. 37 °C (98.6 °F) is generally considered normal body temperature. A fever is defined as 38 °C (100.4 °F) or higher (CDC). For children aged 2 months to 5 years, the WHO counts an armpit (axillary) temperature of 37.5 °C (99.5 °F) or higher as fever — equivalent to 38 °C (100.4 °F) rectally.
What is room temperature in Celsius and Fahrenheit?
Room temperature is typically 20–22 °C, which equals 68–72 °F. This range is considered comfortable for most indoor environments.
At what temperature are Celsius and Fahrenheit the same?
Celsius and Fahrenheit read the same value at −40°. This is the only point where both scales intersect: −40 °C = −40 °F.
How can I quickly estimate Celsius to Fahrenheit in my head?
Multiply the Celsius value by 2 and add 30. For example, 20 °C × 2 + 30 = 70 °F (actual: 68 °F). The error grows with temperature: −2 °F at 0 °C, +2 °F at 20 °C, +4 °F at 30 °C and +6 °F at 40 °C.
Related Temperature Conversions
Key Celsius to Fahrenheit Conversions
- 0 °C to °F (Freezing point)
- 37 °C to °F (Body temperature)
- 100 °C to °F (Boiling point)
- −40 °C to °F (C/F intersection)
Temperature Guides
Temperature Converters
- Celsius to Fahrenheit (°C to °F)
- Fahrenheit to Celsius (°F to °C)
- Celsius to Kelvin (°C to K)
- Kelvin to Celsius (K to °C)
- Fahrenheit to Kelvin (°F to K)
- Kelvin to Fahrenheit (K to °F)
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Engineering Applications
Weather & Aviation
Weather services worldwide report in Celsius, yet public forecasts in the United States still use Fahrenheit. Any syndicated weather data must pass through this formula before reaching American audiences. In aviation, all METARs and TAFs encode temperature in Celsius, but American pilots and ground crews often think in Fahrenheit when assessing icing risk or cabin comfort.
Cooking & Food Safety
A European recipe calling for 180 °C needs to become 356 °F for an American oven dial. Getting the internal temperature of roasted poultry right — 74 °C, equivalent to 165 °F — is a food-safety requirement enforced by the USDA.
Industrial & Manufacturing
Semiconductor fabs specify wafer-bake temperatures in Celsius, while legacy American furnace controllers may only accept Fahrenheit setpoints. A mapping error of even a few degrees can ruin an entire production batch. From plastics extrusion to pharmaceutical lyophilization, this conversion remains one of the most frequently performed unit translations in engineering worldwide.
Data Accuracy
Every conversion on this page uses double-precision floating-point arithmetic (IEEE 754), which provides at least 15 significant decimal digits of internal precision. Results are then rounded to one decimal place for display. The underlying formula — °F = °C × 9/5 + 32 — is the internationally defined relationship between the Celsius and Fahrenheit scales, consistent with the International Temperature Scale of 1990 (ITS-90).
About This Page
Content maintained by the CelsiusFahrenheit.co editorial team. All conversions follow the International Temperature Scale of 1990 (ITS-90) as defined by the Bureau International des Poids et Mesures (BIPM). Calculations use IEEE 754 double-precision arithmetic. Last reviewed: February 2026.