MAXScanner calculator widget

Rebar Weight Calculator — kg/m, lb/ft, Bars & Tonnes

Editable live calculator

Change any input — the result updates immediately

No hidden assumptions. Inputs, units and the working stay visible so you can check the calculation.

Diameter unit Bar diameter Nominal diameter from drawing/BBS.Cut-length unit Cut length per bar Number of bars Whole bars only.Lap / cutting / waste allowance (%) Enter only a project-approved planning allowance.Rate per kg (optional) 0 disables cost.Target mass unit Target mass (optional) Reverse-solves whole equal-length bar count.Measured / published kg per metre (optional) Reports variance without replacing theoretical mass.

Calculated result

532.69 kg · 0.5327 t

0.8878 kg/m · 0.5966 lb/ft

10.654 kg per 12 m bar · 532.69 kg net for 50 bar(s)

No cutting/lap/waste allowance entered

93 whole 12 m bars per theoretical metric tonne

Enter rate/kg for cost planning

Enter target mass for reverse bar-count planning

Enter measured/published kg/m to audit variance

Show the working

1. Area = π/4 × 12² = 113.097 mm².
2. Unit mass = 113.097 × 10⁻⁶ × 7,850 = 0.8878 kg/m.
3. Net mass = 0.8878 × 12 × 50 = 532.688 kg.
4. Order mass = net mass = 532.688 kg.

This is theoretical mass from nominal circular diameter and 7,850 kg/m³ steel density. Rib geometry, rolling tolerances, grade/product standards and actual mill mass can differ. Enter lap/cutting/waste only when your BBS or project method requires it; this calculator does not design reinforcement, lap length, spacing or structural capacity.

More actions

Shared links reopen these inputs. Recent and saved calculations stay in this browser unless you clear site data.