Steel Weight Calculator

What is a Steel Weight?

Steel reinforcement bars (rebar) are the backbone of reinforced concrete construction — they provide tensile strength that concrete alone lacks. Accurately calculating steel weight is essential for structural design, procurement, and cost estimation. The universal formula used by civil engineers worldwide is: Weight (kg) = (Diameter in mm)² ÷ 162 × Length (m). This formula gives the weight of standard mild steel or deformed bars (Fe-415 or Fe-500) per meter, and is derived from the density of steel (7,850 kg/m³) and the cross-sectional area calculation.

How to Use This Calculator

Select the bar diameter from the dropdown — standard sizes in Pakistan are 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, and 32mm. Enter the length per bar in meters (standard bars are 12m, but cut lengths vary). Enter the number of bars. Click Calculate to see weight per individual bar, total weight of all bars, and total weight in metric tonnes. This is the exact format used in bill of quantities (BOQ) preparation.

💡 Pro Tips

• ✓Always add 3–5% for laps, hooks, and wastage when ordering steel for construction.
• ✓Store steel bars off the ground on supports and cover them to prevent rusting before use.
• ✓Use Fe-500 grade steel (yield strength 500 MPa) for earthquake-resistant construction as required by building codes.
• ✓Verify steel deliveries by weighing a sample bar and comparing with the calculated weight — short weight deliveries are common.
• ✓The standard bar lengths in Pakistan are 12 meters — plan your cutting schedule to minimize wastage.

Who Uses This Calculator?

Civil engineers preparing structural drawings with steel schedules. Contractors preparing material cost estimates and BOQs. Construction material suppliers calculating delivery weights. Site engineers verifying steel deliveries against design specifications. Project managers budgeting steel procurement costs for construction projects.

Frequently Asked Questions