Celsius to Fahrenheit Calculator | °C to °F Conversion Chart
🌡️ Advanced Temperature Converter
Conversion History
Celsius and Fahrenheit conversion is a basic but essential skill that everyone needs in daily life. Whether you are a student, reporter, or simply curious about temperature differences, knowing how to convert Celsius to Fahrenheit is necessary. But it can be confusing because there are many conversion formulas that can sometimes mix. To solve this issue, we are here with our Celsius to Fahrenheit Calculator.
This calculator easily converts Celsius to Fahrenheit and Fahrenheit to Celsius. It does not stop here; you can also convert many temperature units, such as Kelvin, Reaumur, Romer, Rankine, and Delisle, into each other. Here you will know how this tool works and how you can use this, including its features.
What is the Celsius to Fahrenheit Calculator?
A tool designed to make it easy for you to convert various temperatures. While studying Science, we know students have to face many conversions which can be so confusing. Moreover, there are different temperature units used worldwide, such as the US uses Fahrenheit, while most countries rely on Celsius. This leads to an issue when we try to convert them.
To help people with this, our Celsius to Fahrenheit Calculator comes in. With this, you don’t need to do the manual conversion; just enter the temperature and select which unit you want it to convert. It will give you an accurate result in no time.
How to Use Our Celsius to Fahrenheit Converter
It’s a simple process of using our tool; however, we have provided some steps for your help.
1. Enter Temperature in Celsius (°C)
Enter the Celsius temperature in the input field.
2. Get Accurate Results
The calculator will automatically show the result in Fahrenheit in the output field.
Why Choose Our Converter
Below, we have mentioned our tool’s best features, which you will get nowhere except from our website. So, go through them one by one.
Completely Free:
You can use this tool for free anytime and anywhere. It’s especially designed to help people, whether they are students, researchers, forecasters, etc, in temperature conversion for free.
Easy-to-use Interface:
You get an easy-to-use interface with the input and output fields. Just enter the temperature, and the tool will automatically give the accurate result in the desired temperature unit.
Secure & Private:
This tool is end-to-end encrypted; it never interfaces with your personal data nor stores it on the server. You will get the100% security of the data.
Instant & Accurate:
Based on the accurate formula, it gives instant and precise results. You can choose any conversion mode and enter the temperature, and then get the answer.
Mobile Friendly:
It is compatible with all devices, whether mobile, desktop, tablets, or MacBooks, making it accessible for all users.
Various Conversion Modes
Besides Celsius to Fahrenheit and Fahrenheit to Celsius, there are many other conversion modes, which are:
How to Convert Celsius to Fahrenheit
- Multiply degrees Celsius by 9/5 or 1.8
- Add 32 to the product answer
There is a common formula used for the conversion between Celsius and Fahrenheit: Formula: (°C × 9/5) + 32 = °F.
Now, we will use this formula and help you understand the conversion of 20 degrees Celsius (centigrade) to degrees Fahrenheit.
- °F = (°C × (9/5)) + 32
- °F = (20 × (9/5)) + 32
- °F = (20× 1.8) + 32
- °F = 36 + 32
- °F = 68
- 20 degrees Celsius is equal to 68 degrees Fahrenheit.
Examples No. 1
Convert 1 degree Celsius to degrees Fahrenheit:
- Formula: (°C × 9/5) + 32 = °F.
- Fahrenheit = 1°C × 9/5 + 32
- = 33.8 °F
Example No. 2
Convert 30 degrees Celsius to degrees Fahrenheit:
- Formula: (°C × 9/5) + 32 = °F.
- Fahrenheit = 30°C × 9/5 + 32
- = 86 °F
Example No. 3
Convert 37 Celsius to Fahrenheit:
- Formula: (°C × 9/5) + 32 = °F.
- Fahrenheit = 37°C × 9/5 + 32
- = 98 °F
Example No. 4
Convert 23 Celsius to Fahrenheit:
- Formula: (°C × 9/5) + 32 = °F.
- Fahrenheit = 23°C × 9/5 + 32
- = 73 °F
Example No. 5
Convert 25 Celsius to Fahrenheit:
- Formula: (°C × 9/5) + 32 = °F.
- Fahrenheit = 25°C × 9/5 + 32
- = 77 °F
Example No. 6
Convert 0 degrees Celsius to Fahrenheit
- Formula: (°C × 9/5) + 32 = °F.
- Fahrenheit = 0°C × 9/5 + 32
- = 32 °F
How to convert Fahrenheit to Celsius
The temperature in degrees Celsius (°C) is equal to minus 32 times 5/9 the temperature in degrees Fahrenheit (°F). There are some simple formulas you can use to convert Fahrenheit to Celsius
- Celsius = (Fahrenheit – 32) × 5/9 or
- Celsius = (Fahrenheit – 32) / (9/5) or
- Celsius = (Fahrenheit – 32) / 1.8
Example No. 1
Convert 35 degrees Fahrenheit to degrees Celsius:
- Formula: Celsius = (Fahrenheit – 32) × 5/9
- Celsius = (35°C – 32) × 5/9
- = 1.6 °C
Example No. 2
Convert 60 degrees Fahrenheit to degrees Celsius:
- Formula: Celsius = (Fahrenheit – 32) × 5/9
- Celsius = (60°C – 32) × 5/9
- = 15.5°C
Why is converting Celsius to Fahrenheit so difficult?
The first noticeable thing is that both Celsius and Fahrenheit scales do not define as starting at zero. The second thing is that Celsius and Fahrenheit scales add a different value for every additional unit of heat energy.
We can’t say that doubling the °C or °F means doubling the amount of heat energy. So it becomes difficult to estimate how much energy 1 degree Fahrenheit or Celsius is. However, the only system that is easy to understand is Kelvin because if we double the value, the heat energy also doubles.
The absolute zero is 0, body temperature is 310.15K, and boiling water is 373.15K. The only thing we cannot use about this scale is its zero end of the scale because it’s too far from human experience to be useful.
How to Convert a Temperature Without a Calculator
There is a shortcut method used to convert Celsius to Fahrenheit without a calculator. It’s important to know that it’s not an accurate yet rough way to estimate conversion when you don’t have a calculator. The way is:
- Multiply the temperature by two,
- Then add 30.
For example
Convert 20 °C to Fahrenheit:
- Start by multiplying the temperature by 2.
- 20 °C × 2 = 40
- Then, add 30.
- 40 + 30 = 70
- So, 20 °C is 70 °F using this method.
Temperature and temperature units
Here we have discussed different temperatures, so it becomes easy to understand them, which will help you a lot in your study as well.
What is temperature?
Temperature is the measure of hotness or coldness, or the energy state of matter. It is an intensive quantity expressed in terms of any of several scales, including Fahrenheit and Celsius. In other words, we can say it’s the average kinetic energy of the atoms and molecules of the object.
Temperature indicates the direction of the heat energy, i.e., from a hotter body at a higher temperature to a colder body at a lower temperature.
What is Fahrenheit?
Fahrenheit is a temperature scale that was first introduced by the Dutch, Gabriel Fahrenheit, in 1724. Its unit is degrees Fahrenheit and is denoted by °F. On the scale, there are different reference points, such as the boiling point of water is 212 °F, the freezing point of water is 32 °F, the temperature of the human body is about 98 °F, and absolute zero is −459.67 °F.
What is Celsius?
In the SI system, Celsius is currently a derived unit for temperature, denoted by °C, which is stated as degrees Celsius. The actual Celsius scale and unit were first introduced by the Swede, Anders Celsius, in 1742. The main reference points on the scale are the boiling point of water, 100 °C, the freezing point of water, 0 °C, and absolute zero, −273.15 °C.
What is Kelvin (K)?
In the SI system, it is the base unit of temperature, which is abbreviated as K. It was first introduced by William Thomson in 1848. The Kelvin scale begins at absolute zero, 0K, the coldest possible temperature, and a change of one kelvin is the same amount of temperature change as one degree Celsius.
What is Rankine (°R, °Ra)?
It is an absolute temperature scale, meaning its zero point is absolute zero, which was first presented by a Scottish, William Rankine, in 1859. The reference point on the Rankine scale is the absolute zero point, being 0 °Ra, like in the Kelvin scale, and the freezing point of water equals 491.67 °Ra. Its formula is °R = °F + 459.67. One Rankine degree is equal to one Fahrenheit degree.
What is Réaumur (°Ré, °Re)?
The Réaumur scale is a historical unit of temperature that was introduced by Réne de Réaumur in 1730. It has the reference points being the freezing point of water, 0 °Re, and the boiling point of water being 80 °Re. The Rømer scale (Danish pronunciation: [ˈʁœˀmɐ]; notated as °Rø), also known as Romer or Roemer. On this scale, the reference points are the freezing point and boiling point of water at 0 and 80 degrees, respectively.
What is Delisle?
It is a temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle.
The reference points on this scale are that the boiling point of water is set at 0 degrees, while the freezing point is set at 150 degrees. It opposite of the other scales because here, as the temperature increases, the Delisle value decreases
What is the Celsius to Fahrenheit chart?
The conversion chart shows various relevant temperatures on both Celsius and Fahrenheit scales. Usually, these useful charts have calibrations for both scales that can help read or estimate any temperature of interest.
However, the conversion formula can be used where the charts are not helpful. The conversion formulas are shown below:
- F=(1.8xC) + 32, or C= (F-32) / 1.8
- F is the temperature on the Fahrenheit scale
- C is the temperature on the Celsius scale.
Celsius to Fahrenheit conversion table:
Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
-273.15 °C | -459.67 °F | Absolute zero temperature |
-50 °C | -58.0 °F | |
-40 °C | -40.0 °F | |
-30 °C | -22.0 °F | |
-20 °C | -4.0 °F | |
-10 °C | 14.0 °F | |
-9 °C | 15.8 °F | |
-8 °C | 17.6 °F | |
-7 °C | 19.4 °F | |
-6 °C | 21.2 °F | |
-5 °C | 23.0 °F | |
-4 °C | 24.8 °F | |
-3 °C | 26.6 °F | |
-2 °C | 28.4 °F | |
-1 °C | 30.2 °F | |
0 °C | 32.0 °F | Freezing point of water |
1 °C | 33.8 °F | |
2 °C | 35.6 °F | |
3 °C | 37.4 °F | |
4 °C | 39.2 °F | |
5 °C | 41.0 °F | |
6 °C | 42.8 °F | |
7 °C | 44.6 °F | |
8 °C | 46.4 °F | |
9 °C | 48.2 °F | |
10 °C | 50.0 °F | |
11 °C | 51.8 °F | |
12 °C | 53.6 °F | |
13 °C | 55.4 °F | |
14 °C | 57.2 °F | |
15 °C | 59.0 °F | |
16 °C | 60.8 °F | |
17 °C | 62.6 °F | |
18 °C | 64.4 °F | |
19 °C | 66.2 °F | |
20 °C | 68.0 °F | |
21 °C | 69.8 °F | Room temperature |
22 °C | 71.6 °F | |
23 °C | 73.4 °F | |
24 °C | 75.2 °F | |
25 °C | 77.0 °F | |
26 °C | 78.8 °F | |
27 °C | 80.6 °F | |
28 °C | 82.4 °F | |
29 °C | 84.2 °F | |
30 °C | 86.0 °F | |
31 °C | 87.8 °F | |
32 °C | 89.6 °F | |
33 °C | 91.4 °F | |
34 °C | 93.2 °F | |
35 °C | 95.0 °F | |
36 °C | 96.8 °F | |
37 °C | 98.6 °F | Average body temperature |
38 °C | 100.4 °F | |
39 °C | 102.2 °F | |
40 °C | 104.0 °F | |
50 °C | 122.0 °F | |
60 °C | 140.0 °F | |
70 °C | 158.0 °F | |
80 °C | 176.0 °F | |
90 °C | 194.0 °F | |
100 °C | 212.0 °F | Boiling point of water |
200 °C | 392.0 °F | |
300 °C | 572.0 °F | |
400 °C | 752.0 °F | |
500 °C | 932.0 °F | |
600 °C | 1112.0 °F | |
700 °C | 1292.0 °F | |
800 °C | 1472.0 °F | |
900 °C | 1652.0 °F | |
1000 °C | 1832.0 °F |
Is the formula for Celsius to Fahrenheit exact?
Yes, it is exact and used for all common purposes. The reason behind this is that
- Both the C and F scales are linear (y = mx + b)
- Two of the well-known temperatures are well-defined: the boiling and freezing points of water. 0C = 32F, freezing and 100C = 212F, boiling
Regarding these valves, the formula is exact. F = (180 C) / 100 + 32 = (9 C) / 5 + 32.
Note: 180 = 212 – 32, which is a required adjustment in balance between C and F (the “b” intercept). And once the intercept is removed, the difference is just in slope: 180/100 or 9/5.
Historically, the relationship between C and F was not always exact, but they are now bound by this equation.
How do you convert Celsius to Fahrenheit without doing any math?
We have provided a crazy shortcut that no one was taught in school. Follow the steps below.
- Double the Celsius number,
- Subtract a tenth of it (a tenth is the same as moving the decimal one place to the left)
- Add 32.
Best example problem:
- C-°37 = F-°98.6
- Double 37 = 74.0
- Minus 7.4 = 66.6
- Add 32 = 98.6
The Reality
You might be thinking that the above shortcut still involves math, but it is still as easy as math can get. It’s simple that if we use our brain for critical thinking, then everything gets easier, whereas the less we use our brain for critical thinking, the harder it gets.
What is Celsius in Fahrenheit?
When we are studying, many questions come into mind, and sometimes we don’t get hte answer clearly. This is one of those questions, and here we have explained it well.
First of all, see the formulas of both units, which are:
- °F = ((°C + 40)* 9/5) – 40 and
- °C = ((°F + 40)* 5/9) – 40
- The equation is like that because it -40°F equals -40°C.
- See that the equations are identical EXCEPT for the fractions.
Here comes the 2nd form of each formula, which is
- °F = ((°C + 40)* 1.8) – 40
- °C = ((°F + 40)/ 1.8) – 40
- This works because -40°F equals -40°C
- Notice that the equations are identical EXCEPT for multiplying or dividing by 1.8.
- To multiply by 1.8, double the number, then subtract 10% of the result.
Why can’t we just add 32 degrees to get from Celsius to Fahrenheit?
If we think as a student, we always wish that why cant things could be simpler and understandable, but this is not how thing works. The same is with this question. The answer is that the people who created these measurements were looking for very different things. They have to keep certain things in mind, e.g, Celsius – 0 should be when water freezes, we use water a lot, and 100 should be when water boils.
However, the Fahrenheit, in some respects, created a measurement more similar to our body. In simple words, we can say that Celsius designed his system with chemistry, and Fahrenheit designed his system with biology.
In the Fahrenheit system, 0 is about the temperature where brine stabilizes, a mixture of ice, water, and ammonium chloride; 32 is the temperature where water freezes, and 96 is about the temperature of the human body. However, these references were later adjusted, such as the 98.6 °F being the temperature of the human body as we know it today.
Example for Better Understanding
Suppose we wanted to measure speed.
Group A decides to use a specific car, and uses 1 A/s as the speed the car is going after accelerating from 0, up to 10 seconds, and 10 A/s as the speed after 15 seconds.
Group B decides to use a horse, and uses 1 B/s as the speed of the horse after accelerating from 0, up to 10 seconds, and 2 B/s as the speed of the horse after 20 seconds.
Results
Both groups end up with very different starting points and scales.
Let’s say A has the following: 1 A/s = 60 mph, and 10 A/s = 95 mph
And B has the following: 1 B/s = 6 mph, and 2 B/s = 12 mph.
A/s = 3.88888 * mph + 56.1111
B/s = B * 2 * mph
What do we understand from this Example?
Of course, the first scale is nonsensical, but let’s work with it anyway. They have very different starting points when they are 0, and they change at different speeds. So, this is the same reason we can’t just say, add X to one of them to get the other. They were designed for different purposes, and thus there’s no exact scale.
How can I write a C program to convert Celsius to Fahrenheit using a while loop?
You can follow the steps given below to do this.
- #include <stdio.h>
- #include <stdlib.h>
- int main()
- {
- float celsius, fahrenheit;
- printf(“\nEnter temperature in celsius: “);
- scanf(“%f”, &celsius);
- fahrenheit = (1.8) * celsius + 32;
- printf(“\n%f deg celsius is %f fahrenheit\n”, celsius, fahrenheit);
- return 0;
- }
Why do we subtract or add 32 in the conversion of Celsius to Fahrenheit?
Both systems used to agree on temperatures, reliable enough to be depended on. Those were agreed as the freezing point of water and the boiling point of water. Fahrenheit used 32 as the set point for the freezing of water to ice and the boiling point of water at 212, some 180 degrees apart.
Celsius, using the same two known repeatable physical values of water as Fahrenheit, decided to divide this scale into 100 units. This means the two systems measure the same two physical properties of water with different numbers of units, 180 (Fahrenheit) against 100 (Celsius), a ratio of 9 to 5, but starting from different points as a numerical value.
So the conversion is always the ratio of 9 to 5 or 5 to 9, and subtraction or addition of 32 adjusts the answer to take account of the different starting point on the measuring scale.
- For Celsius to Fahrenheit, C (9/5) + 32; so (30C x 9/5) 32 = 86
- For Fahrenheit to Celsius, (F-32) x 5/9: and (86F – 32) x 5/9 = 30
How to easily convert Temperature Units in your head?
Celsius to Fahrenheit
Sometimes it happens that we forget the calculator, but to tackle this situation, we have to know how to do conversions without any help. To easily convert, you can follow the Celsius temperature to a Fahrenheit temperature, as given below.
- One degree °C equals 1.8 °F or 9/5. Use the 1.8, which we think is easier.
- If you still find it difficult, then there is a pretty simple way here.
- Multiply the °C reading first by 2 and then take off 10%
- Finally, add that 32 °F
Examples
What is 42 °C in F°?
Multiply 40 by 2 = 80
Remove 10% from 80= 72
Add 32°F offset: 72 + 32 = 104°F
What is 20 °C in F°?
Multiply 20 by 2 = 40.
Remove 10 % from 40 = 40 – 4 = 36.
Add 32 °F offset to that 36 + 32 °F = 68 °F.
What is 100 °C in °F?
Multiply 100 by 2 = 200.
Remove 10 % from 200 = 200 – 20 = 180.
Add 32 °F offset to that 180 + 32 °F = 212 °F.
What is 170 celsius to fahrenheit?
Multiply 170 by 2 = 340.
Remove 10 % from 340= 62 – 6.2 = 55.8
Add 32 °F offset to that 306 + 32 °F = 338°F
What is 31 celsius to fahrenheit?
Multiply 31 by 2 = 62.
Remove 10 % from 62 – 6.2 = 55.8
Add 32 °F offset to that 55.8 + 32 = 87.8°F
What is 33 celsius to fahrenheit?
Multiply 33 by 2 = 66.
Remove 10 % from 66 – 6.6 = 59.4
Add 32 °F offset to that 59.4 + 32 = 91.4°F
Fahrenheit to Celsius
- Remove 32 °F from the °F temperature.
- Multiply the °F by 5/9.
- This is maybe difficult, as 5/9 is 0.555555.
- But we can get close if we divide it by 2 and then add 10 % .
Examples:
What is 100 °F in °C?
Remove 32 °F => 100 – 32 = 68.
Divide 68 by 2 = 34.
Add 10 % => 34 + 3.4 = 37.4.
So, 100 °F is roughly 37.4 °C.
FAQs
Wrapping Up
The Celsius to Fahrenheit calculator is especially designed for students, researchers, and people who have to deal with temperature conversions daily. You can use this tool to convert various temperature units, such as Celsius, Kelvin, Rankine, Reaumur, Romer, Delisle, and Fahrenheit, into each other easily.
All you have to do is select the conversion mode and enter the unit, and this tool will automatically show the result. Moreover, it has an easy-to-use interface, and you can use it as many times as you want for free.