Cable Reel Calculator
Professional Tool

Cable Reel Capacity Calculator

Calculate maximum reel capacity and recommended cable length for any drum dimensions.

Calculator
History
Guide
Reel Parameters
Enter drum dimensions and cable properties below
Unit System
Drum Dimensions
A Flange Diameter
mm
B Barrel Diameter
mm
C Traverse Width
mm
D Cable Diameter
mm
E Edge Clearance
mm

Results are theoretical estimates. Actual capacity may vary due to cable stiffness and winding method.

Reel Diagram
A B C D E
A Flange
B Barrel
C Traverse
D Cable
E Clearance
📐 Calculation Formula
1
Usable Radius (winding depth)
Usable R = (A − B) / 2 − E
Flange ka half minus barrel half, phir clearance minus karo
2
Usable Width
Usable W = C − 2 × E
Traverse width se dono side ki clearance minus karo
3
Layers & Turns per Layer
Layers = floor( Usable R / D )
Turns/Layer = floor( Usable W / D )
Cable diameter se divide karo, floor lena zaroori hai (poori turns)
4
Total Turns
Total = Layers × Turns/Layer
5
Average Winding Diameter
Avg Ø = B + D × (Layers + 1)
Barrel se start, har layer D add karta hai, average lene ke liye +1
6
Max Cable Length
Max Length = Total × π × Avg Ø
Result mm mein aata hai → ÷ 1000 = metres (Metric)  |  ÷ 304.8 = feet (Imperial)
★
Recommended Length (90%)
Rec Length = Max Length × 0.9
Safety margin ke liye 10% kam — actual winding variation ke liye
Calculation History
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How It Works
Dimension guide and calculation method
A
Flange Diameter

Outer diameter of the reel disc — the largest measurement of the drum.

B
Barrel Diameter

Inner core diameter where cable starts winding. Must be smaller than Flange (A).

C
Traverse Width

Usable width of the reel between the two flanges.

D
Cable Diameter

Outer diameter of the cable being wound onto the reel.

E
Edge Clearance

Safety gap at the top of each flange. Optional — set to 0 if not required.

⚠ Note: Results are theoretical estimates based on ideal winding geometry. Actual capacity may vary due to cable stiffness, winding method, and packing efficiency.