What is the Steel Weight Calculator?
Calculate steel weight for round bar, rebar, square bar, flat bar, plate, and pipe with this free steel weight calculator. Enter dimensions and quantity — get total weight in kg or lb, weight per meter or foot, and steel volume. Uses carbon steel density 7850 kg/m³ (490 lb/ft³), adjustable for stainless or other alloys. Metric (mm, m) and imperial (in, ft) units. Runs instantly in your browser.
How to use the Steel Weight Calculator
- Select a steel shape: round bar, square bar, flat bar, plate, or pipe.
- Choose metric or imperial units.
- Enter cross-section dimensions, bar length (or plate width × length), and quantity.
- Adjust steel density if not using standard carbon steel.
- Review total weight, weight per piece, weight per meter/foot, and copy results.
Common use cases
- Estimating rebar weight for a reinforced concrete pour
- Quoting steel plate or flat bar for fabrication
- Calculating pipe weight for structural or plumbing takeoffs
- Comparing metric vs imperial bar sizes on site
- Construction and civil engineering coursework
Frequently asked questions
- What density is used for steel?
- Default is 7850 kg/m³ (490 lb/ft³) for carbon steel. Stainless steel is about 8000 kg/m³; you can change the density field for other alloys.
- How do I calculate rebar weight?
- Choose Round Bar / Rebar, enter diameter in mm (or inches) and bar length in meters (or feet). Weight = π(d/2)² × L × ρ.
- How is pipe weight calculated?
- Hollow cylinder: V = π/4 × (OD² − ID²) × L, where ID = OD − 2 × wall thickness. Then weight = ρ × V.
- Does quantity multiply the total?
- Yes. Enter the number of identical pieces; total weight = weight per piece × quantity.
- What units should I use for plate?
- Enter thickness, width, and length all in mm (metric) or inches (imperial). The calculator computes volume and weight from those three dimensions.
