Spike's Calculators

Internal Angle from the Bend Radius

Curved Pipe

Calculate the internal angle of a curved section of pipe using the bend radius and the length of the curve. This calculator uses inches for measurements.

Bend Angle - Bend Radius

Curve Length in
Bend Radius in
Decimal Precision #


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


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


  1. the internal angle in radians
  2. in decimal degrees
  3. in degrees, minutes, and seconds

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