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Steel Weight Calculator

Estimate reinforcement steel weight from bar diameter, length and number of bars (unit weight tables).

Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.

Result

Fill in the form and click Calculate to see your result here.

How it's calculated

Weight (kg) ≈ d² × L × count / 162 (d in mm, L in metres) for typical TMT, as implemented in the handler.

Example

Example: Steel Weight Calculator

Inputs

  • Bar Diameter: 12
  • Bar Length: 12
  • Number Of Bars: 1
  • Wastage Percent: 3
  • Rate Per Kg: 0

Outputs

  • Unit Weight Per Meter: 0.8889
  • Total Weight: 10.99
  • Estimated Cost: 0

This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.

About this calculator

Steel billing uses kg from diameter and running metres. This calculator applies the standard unit-weight relation so a cutting list can be priced before the bazaar trip.

It does not design beams. Barbending schedules, laps, hooks and seismic detailing come from the structural drawing. Undercutting 12 mm to “save money” is a safety issue, not an optimisation.

Frequently Asked Questions

Standard SI/IS unit weight for round bars: kg per metre ≈ diameter(mm)² / 162, from steel density ≈ 7850 kg/m³. Then × length × bars × (1 + wastage %). Default waste 3%.
kg/m = 144/162 ≈ 0.889 kg/m × 12 m ≈ 10.7 kg before waste.
Only if you put them into length per bar. Straight-length take-off understates cutting schedules.
Same formula for mass of a round section. Grade does not change kg/m.
Optional cost = weight × rate. Zero rate means no cost line.
Form allows 6–40 mm. Outside that, do not trust the 162 formula without a mill certificate.
You enter length per bar and count. For a schedule, sum each diameter separately.
Common cutting waste default. Congested rafts may need more.
No. Bar bending schedule (BBS) from the designer governs purchase.
Same unit-weight idea (d²/162). Rebar page is length × qty; steel page also has wastage and optional rate.

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