If you live in the United States you live and think Fahrenheit but the rest of the world (almost) measures temperature in Celsius so you may often find yourself asking:

How Do You Convert Celsius To Fahrenheit?

The United States is slowly moving to the metric system, but you will keep thinking in Fahrenheit.

You may find things like thermometers, ovens and recipes that give you Celsius temperatures.

To your (fahrenheit) mind a 32 degree day is pretty cold, but if it’s a Celsius temperature, it’s a perfect day for swimming.

I will give you the formula and then I will teach you some shortcuts in case you don’t have a calculator handy…

Fahrenheit = 9/5 C + 32

Now what does that mean? The formula means you take nine fifths of the Celsius number and then you add 32 to that number…

Or in simpler words – The way to do it on your calculator

1. Divide the Celsius number by 5
2. Multiply by 9
3. Add 32

Another Simple Way

Let’s say our Celsius number is 40 (can be the temperature on a very hot day or a very sick child)

1. Multiply the Celsius number by 2 – 40 * 2 = 80
2. Now you want to find 10% of that number (if the number ends with 0 like 80 you only have to take the 0 off so you have 8 – if it’s a different number like 25, write the number with a decimal point at the end – 25. and then move the decimal point one place to the left – 2.5) – For 80 10% is 8
3. Subtract the answer from #2 from #1 80 – 8 = 72
4. Add 32 to the answer 72 + 32 =  104

That’s it – 40C = 104F  (Pretty Hot!!)

How Do You Convert Celsius To Fahrenheit When You Don’t have a Calculator?

After growing up in Brooklyn NY, twenty years ago I moved to a country that uses the metric system. I think I will always think in Fahrenheit but I had to learn some quick tricks for daily life to quickly convert units – Do I need a sweater today? Does my child have fever? Am I baking in a very hot oven or medium? Am I deep frying or charring my wings? …

If You don’t have a calculator you can do most the math in your head and come out with a pretty close number – If you don’t need an exact number you can use this

Keep in mind that Celsius is almost half of Fahrenheit

Fahrenheit boils water at 212 degrees – Celsius boils at 100 degrees

Fahrenheit freezes at 32 degrees – Celsius goes swimming at 32 degrees

The range from freezing to boiling in Celsius is 0-100 or 100 degrees difference

The range from freezing to boiling in Fahrenheit is 32-212 or 180 degree difference

That means a Fahrenheit degree is much smaller than a Celsius one – Ice cream that’s freezing (32F or 0C) almost has to go up 2 Fahrenheit degrees for every Celcius one before it boils (212F or 100C) – It’s actually 9/5, not fully 2 times (2 times would be 10/5)

In daily life, I was always converting Celsius to Fahrenheit so these the short cuts I found:

Look at the steps above

1. Divide by 5 – Any number that ends with 5 or 0 is easy to divide in your head, so just round to the closest 5 or 0 number
2. Now multiply that number by 9 – Do you remember the trick for multiplying by 9? (back to grade 3 or 4 when you learned the times table) – Any number times 9 – Hold up your hands – if you need 9 times 4, put down your fourth finger, starting on the left – Now, how many fingers are on the left of the one that’s down? (3) How many are on the right? (6) – so 9 x 4 = 36
3. Now add 32 to the number (36 + 32 = 68) – with a number like 32 you probably won’t add to a number over 9

If you rounded up or down more than 1 degree add or subtract that degree from your answer

Now, I have to confess, I am pretty good at math, but this is basically simple math so even if math wasn’t your best subject, you can probably do it too

But Here are some other tricks

Basically there are three times that you need to convert

1- Outdoor Temp

2- Oven Temp

3- Fever Temp

Each is different

Outdoor

I really don’t need exact numbers so I can usually use the method of rounding to the nearest 5. In addition, I have learned a few of the daily numbers by heart-

25C = 77F, 30C= 86F, 40C = 104F, 20C = 68F, 15C = 59F — Those are most the temperatures I need in my current home  so while I still “feel” in Fahrenheit, when I hear 25C I automatically think “nice spring day”

Oven Temperature

I just remember the most common temperature for baking – my oven is now Celsius so I think the other way

350F = 180C,  325F = 170C, 400F = 200C

Learn those and it’s easy – every 25 degree Fahrenheit is a 10 degree jump Celsius

Fever

For those you really need exact but if you use them a lot (my kids are always sick) there is a method to remember it all

36.5C = 97.7F, 37C=98.6F, 37.5C = 99.5F, 38C = 100.4F… 40C = 104F

It just goes in steps every step up of .5 Celsius is a step up of .9 in Fahrenheit

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How Do You Convert Celsius To Fahrenheit?

• You can use the formula
• You can prepare charts of common temperatures
• Or, You can learn some of the quickie ways to figure it out yourself and you’ll always be prepared

I hope I answered your question: How Do You Convert Celsius To Fahrenheit