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Total area of caliper pistons per axle in case of FIXED MOUNT calipers.

This is the area of one piston, multiplied by the number of pistons in one caliper, multiplied by the number of calipers on that axle.

In case of different piston diameters per caliper, calculate the area of every different piston, multiplied by the number in which every one of those different pistons occur in one caliper, add those numbers and multiply the result by the number of calipers on that axle.

Total area of caliper pistons per axle in case of FLOATING calipers: Do the calculation as described above, and multiply the result by two.

The area of one piston = π • r² = ¼ • π • d²       (π = 3.14)
So: the area of one piston = 0.785 • d • d        (d = piston diameter in inches or millimeters)

If you prefer to have the math done by your PC, than just enter the required numbers in one of the calculators below. You can overwrite/delete the current numbers. These are just some popular values entered as an example.

REMINDER: For floating calipers, multiply the result of the calculator by 2.

       Standard
N  =
d1  = in
n1  =
d2  = in
n2  =
d3  = in
n3  =

Total Caliper Piston Area
per Axle =  in2

   
N = number of calipers per axle*
d1 = Ø of largest piston in caliper
n1 = number of pistons with d1
d2 = Ø of 2nd largest piston in cal.
n2 = number of pistons with d2
d3 = Ø of 3rd largest piston in cal.
n3 = number of pistons with d3

* Usually 2, although some exotic and/or classic sports cars and race cars have 4 calipers on the front axle (2 per wheel), but not on the rear axle. NOTE:
n1, n2, n3 are per caliper; not per axle!!!

 
       Metric
N  =
d1  = mm
n1  =
d2  = mm
n2  =
d3  = mm
n3  =

Total Caliper Piston Area
per Axle =  mm2

 

Last Update: 01/01/2017
© Vanrossen 2011-2017