3-Point Saddle Calculator — Center & Outside Bend Marks
Who this is for: For electricians hopping pipes, ducts and strut with a saddle that clears on the first pull — and apprentices tired of saddles that pinch the very obstacle they were dodging.
Not the right tool for: 4-point saddles (weaving over two obstructions) — a different mark layout · Obstructions taller than a hand-bender saddle can clear — upsize the conduit or reroute
Enter the obstruction's width and height — get the saddle depth, center-to-side mark spacing, and the total shrink for each angle combo.
Quick answer: 3-point saddle: center mark on the obstruction's centerline, side marks at depth × side multiplier — 45°/22.5° ×2.6, 60°/30° ×2.0, 30°/15° ×3.9 — and total shrink = 2 × depth × side shrink rate. A 4×3" pipe with 1" clearance: depth 4", marks 10.4" either side (45°/22.5°), shrink 1-1/2".
Added to height → saddle depth.
| Combos — for this depth (4") | 45°/22.5° | 60°/30° | 30°/15° |
|---|---|---|---|
| Center ↔ side marks / total shrink | 10.4″ / 1 1/2″ | 8″ / 2″ | 15.6″ / 1″ |
| Mark layout | Center on obstruction · sides at depth × side multiplier |
|---|---|
| Combos | 45°/22.5° ×2.6 · 60°/30° ×2.0 · 30°/15° ×3.9 |
| Total shrink | 2 × depth × side shrink (up-hill + down-hill) |
| Example | 4"×3" pipe + 1" clearance → depth 4", ±10.4", shrink 1-1/2" |
| Footprint check | Spacing must beat half the obstruction width |
| Status | Hand-bender teaching reference (Benfield take-ups, multipliers and shrink), compiled September 2026. Brand shoes vary — the chart stamped on your bender wins. Factory elbows, hydraulic and mechanical bender work are different methods. |
How does a 3-point saddle work?
A saddle hops an obstruction with three bends: up at the first side mark, over the top at the center bend, back down at the second side mark. The classic combo bends the center 45° and the sides 22.5°; tighter work uses 60°/30° and gentle rises use 30°/15°. The side bends use half the center angle, and the marks follow the side-angle multiplier: center mark on the obstruction's centerline, side marks at saddle depth × multiplier — 2.6 per inch of depth for 45°/22.5°, 2.0 for 60°/30°, 3.9 for 30°/15°. Example: a 4" wide, 3" tall pipe with 1" of clearance gives a 4" depth; on the 45°/22.5° combo the side marks sit 10.4" either side of center and the saddle consumes 1-1/2" of run length in shrink (2 × depth × 3/16"). If the spacing comes out smaller than half the obstruction's width, the side bends land on the obstacle — add clearance and try again.
Common uses
- Hopping a crossing pipe or EMT run without an offset on each side
- Clearing a strut or duct in a tight ceiling space where 60°/30° fits
- Batching several saddles at the same depth for a pipe rack row
- Teaching apprentices the mark order: side, center, side
Why the side multiplier, not the center angle
It's tempting to multiply by the center angle's number, but the conduit between a side mark and the center rises at the side angle — the center bend only reverses the direction. So the spacing math uses the side bend's multiplier: 22.5° → 2.6 per inch of depth. The same logic sets the shrink: the saddle is two half-offsets, so its total shrink is double the side-angle rate. That consistency is the handy thing about this calculator's table: the offset page and the saddle page share one multiplier set, so a number learned once works everywhere.