EleCanada
Cable handling

Cable reel calculator

Estimate round-cable reel capacity and loaded mass, with separate checks against volume, cable payload and a supplied minimum drum diameter.

Calculation inputs

Cable and reel data

Cable and planned length
mm

Use the complete cable outside diameter, including jacket or armour. This method assumes regular winding of one uniform round cable.

kg/km

Use verified data for the actual complete cable. This is not conductor metal mass alone.

mm

Obtain the cable manufacturer's reel-winding requirement. Enter drum diameter, not pulling bend radius. No generic cable-type multiplier is assumed.

m

The length to place on this reel. This tool does not infer remaining cable length from a partly filled reel.

Reel dimensions and payload
mm

Outside diameter of the reel flange (A). The method reserves radial clearance of 25.4 mm or one cable diameter, whichever is larger.

mm

Diameter of the barrel supporting the first cable layer (B), not the flange or arbor hole.

mm

Usable winding width between the flanges (C), not the reel's overall outside width.

kg

Verified cable load permitted for the actual reel and condition, excluding its tare. Do not enter reel mass or an unresolved gross-weight limit.

kg

Actual empty-reel mass. Added coverings and other packaging are outside the loaded-mass total unless included in this value.

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Round-cable estimate

Enter all nine cable and reel quantities.

The lesser upper bound accounts for volume and cable payload only. The drum condition must also be met. None of these comparisons approves a reel, winding operation, lifting arrangement or transport load.

The volume method assumes regular winding of one round cable and its stated flange clearance. Different packing or a greater required clearance needs another supported method. Equality does not provide reserve; actual dimensions, cable construction and reel condition still matter.

Gather the actual cable and reel data

Use the cable's overall diameter and mass, the reel's clear winding dimensions, an established cable-payload rating and the cable manufacturer's minimum reel drum diameter. Winding drum diameter is a different requirement from bend radius during pulling or final installation. A reel can have enough space and payload capacity while its drum is too small.

Payload is the allowed cable mass carried by the reel. Tare is the empty reel's own mass. Loaded mass here adds tare to the planned cable mass; it does not establish a permissible gross load for lifting, a vehicle or a reel stand. Resolve gross versus payload ratings with the actual supplier before entering them.

This tool estimates a complete known round-cable/reel combination. It does not select a reel class, derive a product's minimum drum diameter, estimate stock from partial winding, or calculate cable-tray fill. Flat cable, mixed diameters and random winding are outside the method.

Capacity method

Nexans Canada's reel presentation uses flange diameter A, drum diameter B, clear traverse C and overall cable diameter D. In this page's millimetres, radial clearance X = max(25.4, D). Set n = (A − 2X − B) / (1.9D) and t = 0.95C / D. The source equation is F = 0.2617 × [(B + 0.95Dn) / 25.4] × n × t feet, then M = 0.3048F metres.

The 25.4 divisor converts the mean diameter to the inches used by the source. Its continuous factors and approximate coefficient are retained; n and t are not rounded into whole layers or turns. The result is a volume estimate, not an exact winding pattern. The calculator withholds a result if the remaining space cannot accommodate even one full cable layer or one cable width.

Payload-based length is allowable cable payload × 1000 / cable mass in kg/km. Planned cable mass is planned metres × kg/km / 1000. Loaded mass adds the supplied tare. Each comparison uses unrounded arithmetic; displayed values use three decimals or scientific notation.

Worked example

For a hypothetical reel with a 685.8 mm flange, 304.8 mm drum and 457.2 mm traverse, use a 19.05 mm round cable with a supplied minimum drum diameter of 266.7 mm and mass of 417 kg/km. With 250 kg cable payload, 17 kg tare and a planned 300 m length, the volume estimate is 306.940 m and the payload-based length is 599.520 m.

The planned cable weighs 125.100 kg; adding tare gives 142.100 kg. The drum meets the supplied minimum, and the planned length is below both capacity estimates. These are numerical conditions for the supplied scenario, not verified product data or handling approval.

The original presentation gives rounded or truncated example lengths and labels 0.75 inch as 18.9 mm. This example uses the exact conversion 0.75 inch = 19.05 mm and retains arithmetic precision, so small differences from its displayed examples are expected.

Read each condition separately

If the drum is below the required minimum, an apparently generous length estimate does not make the combination suitable. If payload is exceeded, extra empty space does not increase the reel's structural rating. If the volume estimate is exceeded, an adequate mass rating does not create more winding space.

The fixed radial clearance is part of this specific estimate. Use a different supported method if the actual reel, cable or packing instructions require more. Confirm reel condition, product compatibility, coverings, winding arrangement and handling requirements with the relevant supplier. This calculator provides no CEC, provincial or territorial acceptance decision.

For an electrical check on a known installed run, see the voltage drop calculator. Its electrical inputs and limitations are separate from reel capacity.

Common questions

Can I use the reel weight as its cable payload?

No. Reel tare and allowable cable payload describe different quantities. A reel specification listing only its own weight does not establish how much cable it may carry.

Is traverse the overall reel width?

No. It is the usable winding width between the flanges. Overall width includes other parts of the reel.

Does the length estimate prove the cable can bend onto this drum?

No. Enter the manufacturer's minimum reel drum diameter and read that separate comparison. The volume equation cannot establish a cable's permitted drum diameter.

Conduit bendLay out supported offset, segment and saddle marks.PVC expansionEstimate Scepter PVC movement and piston settings.Voltage dropEstimate voltage loss or maximum distance from supplied impedance.

Source and scope

Nexans Canada, Wissam Geahchan, REEL Talk — All You Need to Know, September 28, 2022, PDF pages 19–25; original checked November 10, 2026. The presentation supplies the round-cable volume equation, payload comparison and separate minimum-drum check. Its illustrative product and reel tables are not presets here.

This is a manufacturer's approximate packaging method, not a current wiring-code or structural approval. Inputs and results stay in this page without saving or transmission. Report a problem or suggest a source; values are not attached automatically.