Pi, also known as π, is one of the most important constants. Unfortunately it was later found that he had made a mistake and was only right to 527 decimal places! Measure the circumference of a cylinder or circle using a thin piece of string. A ratio of a circle's circumference to its diameter, pi never terminates but is often given as just 3.142. 10 foot of head to psi = 4.33528 psi. Divide the circumference you found in Step 1 by the diameter you found in Step 2. Ah, that takes me back to when I was a geek in grade school, living in a small town. • If you want to take this a step further, and be able to say that π 16 is roughly equal to 9 × 10 7, check out Nerd Paradise's Calculating Base 10 Logarithms in Your Head, the video Calculating logarithms in your head, and the PDF How to Quickly Calculate Logarithms to Three Decimal Places in Your Head. 20 foot of head to psi = 8.67055 psi Draw a radius from the center to the circumference that makes a small angle. Type in your own numbers in the form to convert the units! ›› Quick conversion chart of foot of head to psi. Pressure to Head / Pump Head Calculator. If you continue to divide, the numbers after the decimal point just keep repeating. It is almost impossible to do in your head. Converting pressure (psi or bar) to head (ft or m) from imperial or SI units. Drop a line from the point of the circle at the end of the radius to the x axis. Whether you're calculating a tip or just in need of some fast math, percentages can be something even math students goof. 5 foot of head to psi = 2.16764 psi. 1 foot of head to psi = 0.43353 psi. Imagine the unit circle centered at the origin of a grid. Fraction Calculator; Circumference Of A Circle Calculator; Arc Length Calculator; Area of a Circle Calculator; See All Calculators; Celebrate Pi. It is important to know whether the pump serves an open or a closed system, because the pump head calculation depends on the type of system that the pump serves. (The circumference is the distance around the circle.) Try to match the edge of the circle to the string as best as you can; the more closely your string matches the circle's circumference, the more accurate your measurement of pi will be. For example, if your circumference from Step 1 is 44 centimeters, and your diameter is 14 cm, then 44/14=3.14. There are formulas to calculate the value of pi, but you would have to repeat it an infinite number of times in your head to find it, so no. Calculating the Pump Head Before we can discuss pump head, we must understand the difference between an open hydronic system and a closed hydronic system. The height of this line is the sine. The nine or 10 digits of Pi (π) which you see on your calculator have been known about probably since 1400. So Pi= 3.142857142857142857142857142857 and so on ad infinitum. You can calculate the circle's circumference in inches with pi in the equations circumference = 2 * radius * pi and circumference = diameter * pi. Use this page to learn how to convert between feet of head and pounds/square inch. Pressure in the head calculator. There is a famous summation formula proudly given to us by mufasa that gives an approximation of pi. Pi Merch; Pi Day Deals; Pi Day Celebrations; Pi Day Competition; Fun Facts About Pi; Pi Quiz; Ways to Celebrate Pi Day; Pi Project; Your Birthday in Pi; Teacher Resources Now that you know how to calculate Pi (π), you could always try your hand at memorising the decimal places of Pi (π). I used to be impressed when mathematical geniuses mentally calculated the value of Pi to a large number of decimal places in their heads.Then I spotted the trick.Pi= 22 divided by 7 = 3.142857.