Free Steel Rebar Weight Calculator

How to Calculate the Weight of Steel per Meter

Site engineers and estimators use a universal derivation to find the unit weight of circular steel reinforcement (TMT) bars. The standard formula is D² / 162.28, where 'D' is the diameter of the bar in millimeters.

Where does 162.28 come from? It is derived from the standard density of steel, which is 7,850 kg/m³. By multiplying the cross-sectional area of the bar (πr²) by the density and a length of 1 meter, the calculation simplifies perfectly to the D²/162.28 constant.

Standard TMT Steel Weight Chart (IS 456)

For quick manual checking on site, here are the standard weights per meter for common bar diameters used in structural design:

Minimizing Wastage in BOQ Estimations

Steel is typically the highest-cost material on any structural project. While standard cutting wastage is usually restricted to 3% to 5%, inaccurate initial estimates or poorly optimized Bar Bending Schedules can severely impact contract margins.

For large-scale government contracts and multi-story structures, manual calculation becomes a liability. Moving your estimation to dedicated software ensures quantities are exact and dynamically linked to prevailing market rates.