Content

• Steps
• Method 1 of 3: Calculating the Approximate Temperature
• Method 2 of 3: Finding a More Accurate Temperature
• Method 3 of 3: Memorize Key Metrics
• Warnings

In most countries, the unit of measure for temperature is Celsius. Many online applications can convert Celsius to Fahrenheit with absolute precision, but if you don't have internet access, use the following methods to get an approximate value.

Steps

Method 1 of 3: Calculating the Approximate Temperature

1. 1 Determine the current temperature. Take a look at the temperature reading. In many tower clocks, the temperature is shown below the time. If you can't find a thermometer or temperature display, ask the other person what temperature they are.
2. 2 Multiply the temperature by 2. Use a calculator or just multiply the number in your head. Be that as it may, the number needs to be doubled.
3. 3 Add 30 to the result. Take the already doubled number and add 30 to it. Use a calculator or do the addition in your head. You will get the approximate temperature in Fahrenheit. For example:
   • Determine the temperature in Celsius: 20 degrees
   • Multiply this number by 2: 20 x 2 = 40
   • Add 30: 40 + 30 = 70 degrees Fahrenheit to the result

Method 2 of 3: Finding a More Accurate Temperature

1. 1 Determine the current temperature. Take a look at the temperature reading. In many tower clocks, the temperature is shown below the time. If you can't find a thermometer or temperature display, ask the other person what temperature they are.
2. 2 Multiply the temperature by 2. Use a calculator or just multiply the number in your head. Be that as it may, the number needs to be doubled.
3. 3 Subtract 10% from this number. Find 10% by multiplying the previous result by 0.1. For example, 100 x 0.1. = 10. Subtract this number from what was obtained in the first calculation. To do this, it is better to use a calculator.
4. 4 Add 32 to the result. Take the number from the previous calculation and add 32 to it. Use a calculator or simply multiply the number in your head. This will give us an approximate Fahrenheit temperature. For example:
   • Determine the temperature in Celsius: 20 degrees
   • Multiply this number by 2: 20 x 2 = 40
   • Find 10% of this number: 40 x 0.1 = 4
   • Subtract this number from the result in the second step: 40 - 4 = 36
   • Add 32: 36 + 32 = 68 degrees Fahrenheit to the result

Method 3 of 3: Memorize Key Metrics

1. 1 Memorize the comparable temperature readings. These numbers are pretty easy to remember and can be used to perform quick temperature conversions. Remember the Celsius to Fahrenheit conversion 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
2. 2 Memorize the comparable temperature readings. These numbers are pretty easy to remember and can be used to perform accurate temperature conversions. Remember the Celsius to Fahrenheit conversion in multiples of 5:
   • -5 degrees Celsius is equal to 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
3. 3 Memorize the comparable temperature readings. Remember the rough conversion from Fahrenheit to Celsius in multiples of 10:
   • 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 is equal to 26.6 degrees Celsius

Warnings

• The fast method is only suitable for the temperature range felt by the human body. The further you go from this range, the less accurate the result becomes.