Rebar Weight Schedules for Slabs and Excel

Start with the specified bar schedule

Record each bar type’s nominal diameter or confirmed kg/m, actual cut length and number of identical pieces. Different lengths, diameters or mass rates belong on separate calculator lines. Include specified bends, hooks and laps in the scheduled cut length before entering it. The calculator does not derive those details from a bar shape or choose a design lap automatically.

Slab schedules are quantity inputs, not designs

Use the engineer’s schedule for each direction, layer, edge reinforcement, chairs and other included items. A slab footprint alone does not determine the required bar diameter, spacing, cover or reinforcement arrangement. The tool can total the specified pieces but does not design the slab, count mesh sheets or approve missing components. Reconcile the take-off with the actual drawings and schedule before ordering.

A mixed-rate schedule example

Suppose one illustrative line uses a confirmed 0.888 kg/m rate, 6 m cut length and 20 pieces. Its mass is 106.56 kg. A second line using 1.58 kg/m, 6 m and 10 pieces adds 94.8 kg, making 201.36 kg scheduled total. These rounded rates are arithmetic inputs and are not a certificate or universal product schedule. Using full nominal diameter calculations can produce a slightly different result.

Keep extra allowance separate

A chosen 5% on the example adds 10.068 kg, giving 211.428 kg of allowance-adjusted estimating mass. The calculator shows both scheduled and adjusted totals. The added equivalent length does not specify whole stock bars, bundle counts or an optimised cutting order. Do not add another lap allowance when those laps are already included in the cut lengths. Confirm the actual stock and purchasing rules separately.

Compare quote bases and tonnes

One metric tonne is 1000 kg, so the example adjusted mass is 0.211428 t. A hypothetical R20/kg material quote gives R4,228.56. With separately quoted R100 fabrication and R50 delivery, the entered budget is R4,378.56. These are arithmetic prices, not current South African market rates. An equivalent per-tonne quote should give the same result. Use one VAT basis and avoid repeating included fabrication or delivery charges.

Download a CSV for Excel

Calculate the result and choose Download CSV for Excel. The snapshot includes each line’s mass basis, diameter where used, cut length in metres, piece count, kg/m, scheduled length, scheduled kg and allowance-adjusted kg. Summary rows provide totals and entered quotes. The file opens or imports in spreadsheet software but has no live formulas and is not a certified bar-bending schedule. Recalculate and export again after editing inputs; keep the source design and supplier documents alongside the snapshot.

Frequently asked questions

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