How is kg/m calculated?

Cross-section area × 7850 kg/m³. 12 mm bar ≈ 0.888 kg/m — matches IS/ASTM tables within rounding.

Mesh sheets instead of bars?

Weigh the sheet from the supplier label — mesh isn't a simple diameter × length product.

Steel weight by diameter, length, and bar count.

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weight (kg) = kg/m (by diameter) × length × bar count

Each rebar diameter has a standard mass per metre (derived from πr² × steel density). Multiply by bar length and quantity for total order weight.

Twenty 6 m bars of 12 mm rebar at 0.888 kg/m weigh about 106.6 kg total — useful for comparing against a mini-truck payload or dealer minimum order.

Epoxy-coated or stainless rebar weighs essentially the same as plain carbon steel.
Cutting waste and lap splices aren't added — extend length or bar count for overlaps.
Deformed bar nominal diameter is the size stamped on the bar, not caliper measure of ribs.

: Cross-section area × 7850 kg/m³. 12 mm bar ≈ 0.888 kg/m — matches IS/ASTM tables within rounding.