Many countries adopt the unit of measurement of degrees Celsius for atmospheric temperature. There are several online applications that can convert the temperature expressed in degrees Celsius exactly to degrees Fahrenheit, but you may not have access to the internet: in this case you can use one of the following techniques, which are able to do the conversion with a good approximation.
Steps
Method 1 of 3: Make a rough calculation
Step 1. Establish the temperature
Find a place where it is displayed. Public clocks usually indicate the thermal clock below the hourly data. If you don't have public clocks or thermometers available, ask someone for information.
Step 2. Multiply the temperature by 2
Use a calculator or do the math in your head. In any case, it is a question of doubling the figure.
Step 3. Add 30 to the resulting figure
Take the doubled number and add 30. Use a calculator or do the math in your head. This will give you the corresponding approximate temperature in degrees Fahrenheit. For instance:
- Establish the temperature in degrees Celsius: 20 degrees.
- Multiply the number by two: 20 x 2 = 40.
- Add 30 to the resulting figure. 40 + 30 = 70 degrees Fahrenheit.
Method 2 of 3: Make a Reasonably Accurate Calculation
Step 1. Establish the temperature
Look for a place where it is displayed, such as a clock on the walls of a public building (such as a bank). Public clocks usually indicate the thermal clock below the hourly data. If you don't have public clocks or thermometers available, ask someone for the information.
Step 2. Multiply the temperature by 2
Use a calculator or do the math in your head. In any case, it is a question of doubling the figure.
Step 3. Subtract 10% from the resulting figure
Calculate 10% by multiplying the figure by 0, 1. For example, 100 x 0, 1 = 10. Subtract this number from what you got by multiplying by 2. For greater accuracy, use a calculator.
Step 4. Add 32 to the resulting figure
Take the doubled number and add 32. Use a calculator or do the math in your head. This will give you a reasonably accurate temperature in degrees Fahrenheit. For instance:
- Establish the temperature in degrees Celsius: 20 degrees.
- Multiply the number by two: 20 x 2 = 40.
- Calculate 10% of this figure: 40 x 0, 1 = 4.
- Subtract the result obtained from your figure: 40 - 4 = 36.
- Add 32 to the resulting figure. 36 + 32 = 68 degrees Fahrenheit.
Method 3 of 3: Memorize the Most Significant Values
Step 1. Memorize comparable round-digit temperatures (multiples of 10)
They are easy to memorize numbers, which allow you to do the conversion quickly. Stores the corresponding temperature in multiples of 10:
- 0 degrees Celsius equals 32 degrees Fahrenheit.
- 10 degrees Celsius equals 50 degrees Fahrenheit.
- 20 degrees Celsius equals 68 degrees Fahrenheit.
- 30 degrees Celsius equals 86 degrees Fahrenheit.
- 40 degrees Celsius equals 104 degrees Fahrenheit.
Step 2. Memorize comparable temperatures (multiples of 5)
These numbers are quite easy to memorize, which allow you to calculate the conversion in a precise way. Stores the corresponding temperature in multiples of 5:
- -5 degrees Celsius equals 23 degrees Fahrenheit.
- 5 degrees Celsius equals 41 degrees Fahrenheit.
- 15 degrees Celsius equals 59 degrees Fahrenheit.
- 25 degrees Celsius equals 77 degrees Fahrenheit.
- 35 degrees Celsius equals 95 degrees Fahrenheit.
Step 3. Memorize comparable temperatures (Fahreneit vs Celsius)
Perform the inverse calculation to obtain the temperature expressed in degrees Celsius starting from degrees Fahreneit:
- 32 degrees Fahrenheit equals 0 degrees Celsius.
- 40 degrees Fahrenheit equals 4.4 degrees Celsius.
- 50 degrees Fahrenheit equals 10 degrees Celsius.
- 60 degrees Fahrenheit equals 15.5 degrees Celsius.
- 70 degrees Fahrenheit equals 21.1 degrees Celsius.
- 80 degrees Fahrenheit equals 26.6 degrees Celsius.
