About this calculator

Steel rebar weight per metre is (diameter² × π/4 × 7850) kg/m³. The calculator returns total weight from diameter, length and number of bars.

Formula: Weight = (π/4 × d² × L × ρ) × N, ρ = 7850 kg/m³

Frequently asked questions

What does the Rebar Weight Calculator do?

Calculate the weight of reinforcing steel bar from diameter and length. Steel rebar weight per metre is (diameter² × π/4 × 7850) kg/m³. The calculator returns total weight from diameter, length and number of bars.

Is the Rebar Weight Calculator free to use?

Yes. Every calculator on Calcora is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Rebar Weight Calculator?

Results are calculated in real time using the formula Weight = (π/4 × d² × L × ρ) × N, ρ = 7850 kg/m³. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified construction & building professional before committing to a purchase or a job.

What inputs does the Rebar Weight Calculator need?

Enter values for: Bar diameter (mm), Bar length (m), Number of bars. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Rebar Weight Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcora.