Best Tips to Convert Celsius to Fahrenheit Without Doing Any Math
|Best Tips to Convert Celsius to Fahrenheit Without Doing Any Math|
As you know, all the important countries in the world use Fahrenheit: We use it, plus the Bahamas, Liberia, Palau, Cayman Islands, Marshall Islands, and the Federated States of Micronesia. Again, all the world’s most prominent countries.
But since lots of other countries still haven’t gotten on the Fahrenheit train, you’re gonna encounter temperatures in Celsius from time to time. And converting Celsius to Fahrenheit takes math: It’s the Celsius temperature times 1.8, plus 32. No thanks.
So here’s a trick to “convert” Celsius to Fahrenheit without using any math. You won’t get the EXACT temperature, but you’ll get a decent ballpark number.
What is Celsius?
Let’s start with the basics: what is celsius? Celsius—sometimes called the centigrade scale—is the most common method of quantifying temperature. It is employed by the International System of Units, or the metric system, which is used in all countries except:
- United States
- Cayman Islands
Named after Anders Celsius, this system has been around since the early 1700s. In today’s form, you will see it depicted as a degree symbol followed by a capital ‘c’ ( °C).
What is Fahrenheit?
If you live in one of the five countries listed above, you’re probably already familiar with Fahrenheit. The Fahrenheit system’s zero degrees (written as 0°F) came about from the temperature of brine, a combination made from equal parts ice, water, and salt.
Daniel Gabriel Fahrenheit proposed this scale in 1724, and it was later adopted as the primary measurement in the above five countries, as well as on various islands. Unlike Celsius, Fahrenheit is a component of the Imperial system (think of inches, pounds, and gallons). That said, it is not nearly as prevalent in the science community as its metric system counterpart.
Celsius vs Fahrenheit: Key Differences
Before we explain how to convert Celsius to Fahrenheit (and Fahrenheit to Celsius), let’s review the main differences between the two temperature scales.
Celsius (written as °C and also called Centigrade) is the most common temperature scale in the world, used by all but five countries. It’s part of the International System of Units (SI), or what you might know as the metric system, which is typically used in science classes (think centimeters, meters, kilograms, milliliters, etc.) and in science as a whole.
By contrast, Fahrenheit (written as °F) is only used officially by five countries in the world:
- United States
- Cayman Islands
Fahrenheit is not part of the metric system; rather, it’s part of the Imperial system, which includes forms of measurements such as inches, feet, pounds, gallons, etc. Moreover, unlike Celsius, it is not typically used in science.
Why do some recipes use Celsius and others Fahrenheit?
Recipes either appear in Celsius and/or Fahrenheit due to their country of origin's use of the metric system (as Europe does) or imperial units (as the United States does). All countries in the world except for the United States, Myanmar and Liberia use the metric system.
How to Convert Celsius to Fahrenheit (Exact Calculation)
If you're looking to get a more precise calculation, you can use this exact formula. You may want to have a calculator handy when you do this.
(Celsius temp. × 1.8) + 32 = Fahrenheit temp.
Begin the conversion by multiplying the temperature in Celsius by 1.8 (or 9/5), then add 32 to your answer to get the Fahrenheit reading.
Here's an example using 30 degrees Celsius.
(30 x 1.8) + 32 = 86 F
How to Convert Fahrenheit to Celsius (Exact Calculation)
When converting Fahrenheit to Celsius, you simply reverse the same equation above. Subtract 32 from the degrees in Fahrenheit, then divide your answer by 1.8.
(Fahrenheit temp. – 32) ÷ 1.8 = Celsius temp.
Here is the formula in action starting with 80 degrees F:
(80 – 32) ÷ 1.8 = 26.6 C (or round up to 27 C)
How to Convert Celsius to Fahrenheit Quickly
This formula will help you make a close estimate for a Fahrenheit temperature when you're converting from Celsius. This is a great formula to do quickly in your head. Simply multiply the Celsius temperature by 2 and add 30 to it:
(Celsius temp. x 2) + 30 = Fahrenheit temp.
Here's an example using 30 degrees C.
(30 x 2) + 30 = 90 degrees F.
This is pretty close to the 86 degrees F reading you'd get using the more precise method (explained later).
How to Convert Fahrenheit to Celsius Quickly
To do a rough approximation of Celsius using Fahrenheit, reverse the earlier formula. Subtract 30 from the Fahrenheit degrees, then divide your answer by 2.
(Fahrenheit temp. – 30) ÷ 2 = Celsius temp.
Let's say the Fahrenheit temperature is 80 degrees. The approximate Celsius temperature would be:
(80 – 30) ÷ 2 = 25 C