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Pole pocket calculator

Work out the cut allowance, finished pocket depth and weld position for a round tube.

Enter your dimensions

mm
mm
mm
mm

Measured vertically from the top of the tube to the point where the pocket closes at the lower edge of the weld.

End profile

Live drawing

Extra fabric beyond finished size

0mm

Cut extension from the finished-size line.

Rear mark from cut edge

0mm

Measure up from the new cut edge and mark the top-of-weld line.

Total fabric cut height

0mm

Finished height plus the extra pocket allowance.

Effective pocket diameter

0mm

Theoretical circular pocket size.

How the calculation works

The weld point sits directly above the tube by the specified gap. From there the fabric runs tangent to the tube, wraps around its exposed lower arc, and returns along the opposite tangent. Because the finished height already reaches to the bottom of the loaded pocket, the vertical weld-to-bottom distance (diameter + gap) is already included. Extra fabric = complete pocket path + weld width − (diameter + gap). Total cut height = finished height + extra fabric. For the rear marking line, turn the cut sheet over and measure upward from its new cut edge by the complete pocket path plus two weld widths. Effective pocket diameter is the complete usable pocket path divided by π, showing the theoretical size if the welded pocket formed a perfect circle. Values are rounded to the nearest millimetre. Always confirm a sample against your fabric stretch, weld process and tube fittings.