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⚠️ Approximate estimate, based on average industry rates. Verify against the manufacturer datasheet.
Rebar weight is set by bar diameter and mesh spacing: Ø8 weighs 0.395 kg/m, Ø10 — 0.617, Ø12 — 0.888 kg/m. A floor slab typically gets two meshes at 150–200 mm spacing; bar laps at joints are at least 40 diameters, adding ~5–10% to the total length.
The calculator works out total bar length with laps, converts it to kilograms and tonnes, and adds tying wire and cover spacers. Diameter and spacing for a specific structure are always set by the design — the calculator helps you estimate quantity and cost fast.
Total bar length depends on slab dimensions, spacing in both directions, number of layers and laps. Length is then converted to weight from the mass per metre of the selected diameter. The calculator also adds tying wire and spacers.
This is a quantity calculation, not structural design. Diameter, spacing, anchorage, lap length and cover must be specified by the structural design.
Suppliers often price by kilogram or tonne, while drawings show bars in metres and pieces. The calculator connects the two.
No. Diameter and spacing are structural design decisions. They are entered only to calculate quantity and cost.
Extra bars at supports and openings, U-bars, anchorage, laps, cages and installation waste.