Celsius to Fahrenheit Converter
Free online Celsius to Fahrenheit converter. Convert °C to °F instantly with the formula °F = (°C × 9/5) + 32. Includes reference tables, cooking temps, and body temperature guide.
Formula
°F = (°C × 9/5) + 32
Quick Reference Table
Popular Celsius to Fahrenheit Conversions
The most commonly searched Celsius to Fahrenheit conversions. These cover everyday weather, body temperature, cooking, and key scientific reference points.
C & F are equal
Water freezes
Cool weather
Room temperature
Warm day
Hot day
Body temperature
Heat wave / Fever
Water boils
Oven (moderate)
Oven (hot)
Oven (very hot)
Celsius to Fahrenheit Formula
Celsius to Fahrenheit
°F = (°C × 9/5) + 32
Fahrenheit to Celsius
°C = (°F − 32) × 5/9
Quick Mental Math Shortcut
°F ≈ (°C × 2) + 30
Example 1: 25°C → (25 × 9/5) + 32 = 45 + 32 = 77°F
Example 2: 37°C → (37 × 9/5) + 32 = 66.6 + 32 = 98.6°F
Example 3: 100°C → (100 × 9/5) + 32 = 180 + 32 = 212°F
Quick estimate: 25°C → (25 × 2) + 30 = ~80°F (actual: 77°F)
Fahrenheit to Celsius Conversion Table
Complete Fahrenheit to Celsius reference table. Looking for Celsius to Fahrenheit? Scroll up to the main conversion table above.
Weather Temperature Guide: Celsius vs Fahrenheit
Cooking Temperature Conversions
Essential oven and cooking temperature conversions between Celsius and Fahrenheit. Most recipes from the US use Fahrenheit, while European and international recipes use Celsius.
Body Temperature: Celsius to Fahrenheit
Medical temperature reference chart. Normal human body temperature is 37°C (98.6°F). Temperatures above 38°C (100.4°F) indicate a fever.
Hypothermia (<35°C / <95°F)
Body temperature below 35°C (95°F) is hypothermia. Seek immediate medical attention. Symptoms include shivering, confusion, and drowsiness.
Normal (36.1-37.2°C / 97-99°F)
Normal body temperature ranges from 36.1°C to 37.2°C (97°F to 99°F). The average is 37°C (98.6°F). Temperature varies by time of day and activity.
Low Fever (37.3-38°C / 99.1-100.4°F)
A mild or low-grade fever. Monitor symptoms. Rest, stay hydrated, and take temperature readings regularly. Consult a doctor if it persists.
High Fever (>38°C / >100.4°F)
A temperature above 38°C (100.4°F) is a significant fever. Above 39.4°C (103°F) is a high fever. Seek medical attention, especially in children and elderly.
Celsius vs Fahrenheit: Understanding the Difference
The Celsius scale is based on water: 0°C is the freezing point and 100°C is the boiling point, making it intuitive for scientific and everyday use. Fahrenheit was designed around different reference points and has a wider range (180 degrees between freezing and boiling vs 100 in Celsius), which some argue gives more precision for weather temperatures without decimals.
All Temperature Scales Compared
Convert Celsius to Fahrenheit in Code
function celsiusToFahrenheit(celsius) {
return (celsius * 9 / 5) + 32;
}
function fahrenheitToCelsius(fahrenheit) {
return (fahrenheit - 32) * 5 / 9;
}
// Examples
celsiusToFahrenheit(0); // 32
celsiusToFahrenheit(100); // 212
celsiusToFahrenheit(37); // 98.6
fahrenheitToCelsius(72); // 22.22def celsius_to_fahrenheit(celsius):
return (celsius * 9 / 5) + 32
def fahrenheit_to_celsius(fahrenheit):
return (fahrenheit - 32) * 5 / 9
# Examples
print(celsius_to_fahrenheit(0)) # 32.0
print(celsius_to_fahrenheit(100)) # 212.0
print(celsius_to_fahrenheit(37)) # 98.6
print(fahrenheit_to_celsius(72)) # 22.22// Celsius (A1) to Fahrenheit:
=(A1*9/5)+32
// Fahrenheit (A1) to Celsius:
=(A1-32)*5/9Common Mistakes When Converting Temperature
Forgetting to add 32 in the formula
The most common error: 25°C × 9/5 = 45, but you must add 32 to get 77°F. Without adding 32, your answer will always be 32 degrees too low.
Mixing up the order of operations
For C to F: multiply first, then add. For F to C: subtract first, then multiply. Getting the order wrong gives wildly incorrect results. Remember: °F = (°C × 9/5) + 32.
Using the wrong direction formula
C to F and F to C are different formulas. If converting from Celsius, multiply and add. If converting from Fahrenheit, subtract and multiply. Using the wrong formula gives nonsensical results.
Assuming equal increments
A 1°C change equals a 1.8°F change (not 1°F). So if temperature rises from 20°C to 25°C, that is a 9°F increase (68°F to 77°F), not a 5°F increase.
Frequently Asked Questions
What is the formula to convert Celsius to Fahrenheit?
The formula is: °F = (°C × 9/5) + 32. Multiply the Celsius temperature by 9, divide by 5, then add 32. For example, 25°C × 9/5 + 32 = 77°F. You can also use the shortcut: double the Celsius value and add 30 for a rough estimate.
What is 0 degrees Celsius in Fahrenheit?
0°C equals 32°F. This is the freezing point of water at standard atmospheric pressure. It is one of the two key reference points used to define the Fahrenheit and Celsius scales.
What is 100 degrees Celsius in Fahrenheit?
100°C equals 212°F. This is the boiling point of water at standard atmospheric pressure (sea level). It is the second key reference point for both temperature scales.
What is 37 degrees Celsius in Fahrenheit?
37°C equals 98.6°F. This is the average normal human body temperature. A temperature above 38°C (100.4°F) is generally considered a fever.
What is body temperature in Celsius and Fahrenheit?
Normal human body temperature is approximately 37°C or 98.6°F. However, it can range from 36.1°C to 37.2°C (97°F to 99°F) depending on the time of day, activity level, and individual variation.
At what temperature are Celsius and Fahrenheit the same?
-40 degrees is where Celsius and Fahrenheit are exactly equal. That is, -40°C = -40°F. This is the only point where both scales intersect. You can verify: (-40 × 9/5) + 32 = -72 + 32 = -40.
How do I convert Fahrenheit to Celsius?
The formula is: °C = (°F - 32) × 5/9. Subtract 32 from the Fahrenheit temperature, multiply by 5, then divide by 9. For example, 77°F: (77 - 32) × 5/9 = 45 × 5/9 = 25°C. Use our converter above — click the swap button to convert F to C.
Why does the US use Fahrenheit instead of Celsius?
The US adopted Fahrenheit in the 18th century from Britain and never switched. Most other countries adopted Celsius as part of the metric system. The US, along with a few other territories, continues to use Fahrenheit for everyday weather and cooking temperatures.
What is room temperature in Celsius and Fahrenheit?
Room temperature is typically defined as 20-22°C (68-72°F). In scientific contexts, standard room temperature is 25°C (77°F). Most thermostats in the US are set to around 70°F (21°C).
How do I quickly estimate Celsius to Fahrenheit?
Quick mental math: double the Celsius number and add 30. For example, 20°C → 20×2 + 30 = 70°F (actual: 68°F). This gives a close approximation within a few degrees for everyday temperatures.
What is the boiling point of water in Fahrenheit?
Water boils at 212°F (100°C) at standard atmospheric pressure (sea level). At higher altitudes, water boils at a lower temperature due to reduced atmospheric pressure. For example, at 5,000 feet elevation, water boils at about 202°F (95°C).
What is the freezing point of water in Fahrenheit?
Water freezes at 32°F (0°C) at standard atmospheric pressure. Below 32°F, water turns to ice. This is why 32°F is such an important threshold in weather forecasting.
Which countries use Celsius vs Fahrenheit?
Almost every country in the world uses Celsius, including all of Europe, Asia, Africa, South America, and Oceania. The United States, its territories, and a few Caribbean nations (Bahamas, Cayman Islands, Palau) are the primary users of Fahrenheit.
What are common oven temperatures in Celsius and Fahrenheit?
Common oven temperatures: 150°C = 300°F (slow), 180°C = 350°F (moderate), 200°C = 400°F (hot), 220°C = 425°F (very hot), 230°C = 450°F (extremely hot), 250°C = 480°F (broil). 180°C/350°F is the most common baking temperature.
What is absolute zero in Celsius and Fahrenheit?
Absolute zero — the coldest possible temperature — is -273.15°C or -459.67°F. At this temperature, all molecular motion stops. It is 0 Kelvin on the Kelvin scale.
Disclaimer: This tool provides approximate conversions for reference purposes. Results may vary slightly depending on browser rendering, root font size, and viewport settings. Always verify values in your specific development environment.