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Steel Weight Calculator
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This Steel Weight Calculator estimates the weight of reinforcement bars (rebar) from their diameter, length, and quantity, using both the standard steel density calculation (7850 kg/m³) and the widely used construction quick-reference formula d²/162 for unit weight in kg/m. Enter your bar diameter in millimeters, length per bar, and how many bars you need, and get the weight per bar and total weight in both kilograms and tonnes. It's built for estimating material weight for transport, ordering, or structural load calculations. Everything runs locally in your browser. Scroll down to enter your bar specifications.
Features
- Calculates rebar weight from diameter, length, and quantity
- Shows both exact volumetric and d²/162 quick-reference results
- Total weight shown in kilograms and tonnes
- Instant recalculation as you adjust inputs
Why use this steel weight calculator?
- Matches standard construction industry reference formulas
- Useful for material ordering and transport weight estimates
- Fully private — nothing uploaded
- Free with unlimited use
Frequently asked questions
What is the d²/162 formula?
It's a widely used construction industry approximation for mild steel rebar unit weight in kg per meter, where d is the bar diameter in millimeters — this calculator shows it alongside the exact volumetric calculation for cross-checking.
What steel density does this use?
7850 kg/m³, the standard density for mild steel used in construction rebar calculations.
Why do the two weight figures sometimes differ slightly?
The d²/162 formula is a rounded industry approximation; the volumetric calculation (using π × r² × length × density) is mathematically exact — both should be close but the volumetric figure is more precise.
Can I use this for structural design?
This is a material weight estimation tool for ordering and planning, not a substitute for structural engineering calculations, which should be done by a qualified engineer.
Does this work for other bar diameters like #4, #6 rebar sizes?
Convert your bar's designation to its actual millimeter diameter first (e.g. US #4 rebar ≈ 12.7mm), then enter that value.