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Conduit Bending Planner

Lay out offsets, 3‑bend saddles, 4‑bend saddles, 90° stubs, and back‑to‑back 90s. Get mark spacing, shrink, and take‑up, with a live visual and a phone tilt readout for angle checks.

All math runs locally in your browser. No uploads. No tracking.

Mode & basics

Geometry

Angle presets, multipliers & shrink (info)

Offset multiplier M = 1 / tan(θ). Common M values: 10° 5.76, 15° 3.86, 22.5° 2.61, 30° 2.00, 45° 1.41, 60° 1.15.

Approx. shrink per inch of rise for a two-bend offset (rules of thumb): 10° ≈ 1⁄16 in, 15° ≈ 1⁄8 in, 22.5° ≈ 3⁄16 in, 30° ≈ 1⁄4 in, 45° ≈ 3⁄8 in, 60° ≈ 1⁄2 in.

Results

Enter your details and select Calculate.

Visual layout

Drag the blue marks along the conduit line to experiment; values update on Calculate.

Phone tilt (optional)

Use your phone to check bend angle. Grant motion permission if prompted.

0.0°
Method & assumptions
  • Offset (two-bend): spacing S = M × rise, where M = 1 / tan(θ). Shrink ≈ rise × shrinkFactor(θ). We subtract shrink from the advance.
  • Three-bend saddle: outer bends at θ, center bend at 2θ. Place marks: first outer; then S = M × rise to center; then S again to second outer.
  • Four-bend saddle: four bends all at θ. Spacing pattern along the conduit: S, then obstacle width, then S. Here S = M × rise.
  • 90° stub: stub length to back-of-bend = desired stub + take-up; springback adds to the dial setting.
  • Back-to-back 90s: inside length between 90s = desired inside dimension − 2 × take-up.

About this free conduit bending calculator

This online conduit bending calculator plans two-bend offsets, three-bend saddles, four-bend saddles, 90° stubs, and back-to-back 90s. It shows mark spacing, estimated shrink, and lets you enter your own take-up and springback. Everything runs in your browser, with a visual layout, shareable URL, and PNG/SVG export.

What are multipliers and shrink?

The multiplier converts rise to spacing between bends: M = 1 / tan(θ). Shrink is the reduction in straight-line advance due to the offset; many electricians use simple rules of thumb per degree to keep layout quick in the field.

Conduit bending FAQ

Do I enter the bend angle on the bender or the final angle?

Enter the intended finished angle. The tool adds your springback value to the dial target so you can slightly over-bend and return to the intended angle.

Does take-up vary by bender and conduit size?

Yes. Enter your own take-up (deduct) measured from your bender and size. The tool uses your value for 90° stubs and back-to-back 90s.

How accurate are shrink factors?

They are common field approximations. For critical work, measure on your specific bender and material and adjust the shrink factor accordingly.