Steel Weight Calculator
Estimate the weight of round bars, plates, pipes, I-beams, angles and more — with engineering drawings and a printable PDF report.
Material cost estimate (optional)
How to calculate steel weight
Three simple steps to an accurate steel weight estimate.
Round bar, square bar, plate, pipe, I-beam, angle — choose the section closest to what you're using.
Add the dimensions in your preferred units. Mix metric and imperial freely — the math is unit-aware.
Total weight, unit weight, volume, and optional material cost — broken down clearly with metric and imperial units.
Steel Weight Calculator — Free & Accurate
Our steel weight calculator helps fabricators, engineers, contractors, and DIYers estimate the weight of any common steel section. Pick a section type — round bar, square bar, flat bar, plate, pipe, I-beam, or angle — enter the dimensions in your preferred units, and get a complete weight breakdown in seconds.
The calculator lets you pick from common steel grades (tool steel, wrought iron, carbon tool steel, cold-drawn steel, carbon steel, C1020 HR steel, pure iron, mild steel, stainless steel — densities from 7,715 to 8,030 kg/m³) or enter a custom density for any alloy. It applies the correct cross-section formula for each profile: for pipes, it subtracts the inner bore from the outer cylinder; for I-beams, it sums the area of both flanges and the web; for angles, it uses the standard (a + b − t) × t section formula.
Results show total weight in kg, lb, and tons (for large quantities), plus unit weight per piece, total volume, and an optional cost estimate in your local currency. Everything runs in your browser — no signup, no data sent to any server.
Why use this calculator?
Built for the site, not the spec sheet — simple, fast, and accurate.
No spreadsheets, no formulas to memorise. Type your sizes, hit calculate, and you're done.
Pick from 9 common steel grades — or enter a custom density — and the right cross-section formula for each profile.
Everything runs in your browser. Your dimensions never leave your device.
Mix metres, feet, inches, and centimetres on the same job — the math converts cleanly.
Get the total weight in kilograms, pounds, and metric tons — all at once, no manual conversion.
Open it on your phone right at the workshop. Fully responsive, no app needed.
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Frequently asked questions
You pick the steel type from the "Steel type" dropdown — nine common grades from tool steel (7,715 kg/m³) up to stainless steel (8,030 kg/m³), with C1020 HR steel (7,850 kg/m³) selected by default. For anything not on the list, pick "Enter custom steel density" and type the manufacturer-specified value. Non-ferrous metals (aluminium ~2,700 kg/m³, brass ~8,500 kg/m³, copper ~8,960 kg/m³) are supported through the custom field.
We compute the cross-section area as π/4 × (OD² − ID²), where the inner diameter (ID) equals OD − 2 × wall thickness. That area, multiplied by the pipe length and steel density, gives the total weight. The hollow centre is not counted.
The cross-section area is the sum of two flanges plus the web between them: (2 × flange_width × flange_thickness) + (web_thickness × (height − 2 × flange_thickness)). Multiply by length and steel density. For real I-beams the flange-to-web fillets add a small extra mass — actual mill weights may run a few percent higher than this estimate.
Seven of the most common shapes: round bar, square bar, flat bar, steel plate, pipe (hollow), I-beam (universal beam), and angle (L-section). Each has its own engineering drawing and dimension fields tailored to that profile.
Yes. Every dimension has its own unit picker, so you can enter diameter in mm, length in feet, and thickness in inches on the same calculation. The math converts everything to consistent units internally.