Rebar Length Calculator
Calculate rebar quantities, weight, and cutting requirements for construction projects. Supports all standard rebar diameters from 8mm to 40mm.
Rebar Length Calculator
Selected: Ø12mm rebar — 0.888 kg/m standard weight
Tips for Rebar Estimation
Use Standard Bar Lengths
Rebar comes in standard lengths: 6m, 9m, 12m. Plan cuts around these to minimize waste.
Account for Hook Lengths
Standard hooks (90° and 135°) add extra length. Use bend allowance of 8-12× diameter for accurate calculations.
Consider Lap Splices
When bars need to be joined, lap splices add 40-60× diameter per splice. Factor this into total length.
Check Cover Requirements
Concrete cover (typically 25-50mm) affects bar placement. Ensure cut lengths account for proper cover on all sides.
Frequently Asked Questions
How do I calculate rebar length for a slab?
Multiply the slab dimension by the spacing factor (1000/spacing in mm), add lap splices and hook lengths. The calculator simplifies this by taking total required length.
What is the weight of 12mm rebar per meter?
12mm rebar weighs 0.888 kg/m. This is the standard weight for Fe 500 grade rebar.
How much extra rebar should I order?
Order 5-10% extra for waste, lap splices, and bending allowances. For complex cages, order 10-15% extra.
What bend allowance should I use?
Standard bend allowance is 8× diameter for 90° bends and 16× diameter for 135° bends. Check your local code for exact requirements.
Need 1D Bar Cutting Optimization?
Optimize rebar cuts from standard bar lengths to minimize waste.
Launch 1D Optimizer