Construction & estimating · Concrete & reinforcement

Bar schedule & rebar weight calculator

Reinforcement mass by bar mark, totals by diameter and tonnage to order.

Standard: AS/NZS 4671 bar masses (d²/162 kg/m)

Inputs in the worked example

The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.

Input	Value	Unit
Bars: mark, diameter (mm), number, length (m) — one per line	B1, 12, 40, 6.0 B2, 16, 24, 7.2 L1, 10, 60, 1.8 C1, 20, 16, 3.6
Laps & wastage allowance	5	%

Concrete materials estimate — Cement bags, sand, aggregate and water for site-mixed concrete by ratio, with wastage.
Formwork contact area — Formwork area for slabs, beams, columns and footing edges, ply sheets allowing for re-use, and cost.
Concrete volumes & cost — Volumes for footings, slabs, beams and columns, order quantity rounded to 0.2 m³, trucks and cost.
Reinforcement quantities & cost — Steel tonnage from a kg/m³ ratio or a bar list, with laps and waste, supply and fix cost.
Earthworks cut & fill — Volumes from cross-section areas, loose and compacted volumes, truck loads and a mass-haul diagram.
Excavation, cart-away & disposal — Excavated bank volume with batters, bulking, backfill retained, truck loads, tonnes to tip and cost.

For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.