TMT Bar Weight Calculator
Calculate the theoretical weight of a steel reinforcement bar from its diameter and length.
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Unit weight
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Weight per bar
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Method:
Theoretical mass is calculated from the nominal circular cross-section using steel density 7,850 kg/m³:
Weight = (π/4) × (d/1000)² × L × 7,850.
The commonly used shortcut d²/162 kg/m is an approximation of the same relationship. Actual supplied TMT bar mass can vary within manufacturing and standard tolerances, so use measured or certified mass where contractual accuracy is required.
Weight = (π/4) × (d/1000)² × L × 7,850.
The commonly used shortcut d²/162 kg/m is an approximation of the same relationship. Actual supplied TMT bar mass can vary within manufacturing and standard tolerances, so use measured or certified mass where contractual accuracy is required.