Spike's Calculators

Bend Radius and Angle

Curved Pipe

Calculate the bend radius and the angle from the length of the curve and the height. This calculator uses inches for measurements. You do not always know the angle or the bend radius to calculate the volume of a curved section of pipe, but the two measurements needed for this calculation are easy to get.

Bend Radius and Angle

Curve Length in
Curve Height in
Decimal Precision #


Bend Radius in
Angle in Radians rad
Decimal Degrees °
Degrees Minutes Seconds ° ' "


  1. enter the curve length in inches
  2. the height of the curve in inches
  3. decimal precision, the number of digits after the decimal point


  1. the bend radius in inches
  2. the internal angle in radians
  3. in decimal degrees
  4. in degrees, minutes, and seconds

r = (d²/h+h)/2
a = sin-1(d/r)
where r is the bend radius
the angle in radians
d half the length of the curve
h the height of the curve
r the bend radius
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