Celsius and Fahrenheit conversion formulas may be difficult for you to remember or keep straight. They initially were for me when I was studying for the PTCB Exam, so out of necessity I looked for a work around to use in a pinch.

The Ball-parking system below is very simple, yet surprisingly helpful. 30 degrees C is really as high as you can go using this system. Luckily, It covers just about everything you need for the purpose of the test you are taking.

Here's a low budget video of how to ball-park Temperature Conversions.

Here are instructions :

✓ Draw a vertical line (about 6").

✓ Put a small circle at the bottom so it looks like a thermometer.

✓ Just above the circle, draw a horizontal hash mark.

✓ Draw 3 more hash marks above that about 1" apart.

✓ Put a C on the Left and a F on the right at the top of the line.

✓ On the lowest hash mark, write 0 on the left and 30 on the right.

✓ On the next hash mark up write 10 on the left and 50 on the right.

✓ On the next hash mark up write 20 on the left and 70 on the right.

✓ On the next hash mark up write 30 on the left and 90 on the right.

✓ Do you notice the pattern?

✓ Each time CÂ° goes up 10Â°, FÂ° goes up by 20Â°.

Try some examples from your practice exams and see what you think.

** Disclaimer:
Using this ball-parking system is really just making a â€œbetter guess" at which answer is correct on a test. It should only be used if you cannot remember the formulas and should never be used in the workplace. The answer the system gives may be â€œclose" to correct, but it's really just in the â€œball-park". Think of it as an extended part of your process of elimination. It may also be used to cross check answers you get using the formula.