Calculate Weight of Aluminum Flat Bar
Enter width, thickness, length, and quantity. Choose an alloy density (or set a custom value) to get per-piece and total weight in kg and lb. Results update instantly.
Formula
Weight = Volume × Density
Volume = Width × Thickness × Length
Use consistent units. This page converts everything internally for you.
Metric quick form (default density 2700 kg/m³):
Weight (kg) = (Wmm/1000) × (Tmm/1000) × Lm × Densitykg/m³
The calculator uses the exact conversion factors (1 in = 25.4 mm, 1 ft = 0.3048 m, 1 kg = 2.2046226218 lb).
Calculator
Switch units, choose alloy density, and copy/share results.
Bar width (the larger face dimension).
Bar thickness (the smaller dimension).
Cut length of one piece.
Number of identical pieces.
Density
Pick an alloy preset or enter a custom density.
Values are typical; check your certificate/datasheet for exact density.
Common default: 2700 kg/m³.
Notes
- Results are theoretical (nominal dimensions). Actual weight may vary with tolerances and alloy composition.
- If your drawing uses inches for length too, switch to Imperial and enter feet (or decimals of feet).
- For shipping estimates, add packaging allowance separately.
Quick Reference (Typical Density 2700 kg/m³)
Example weights for common sizes. Use the calculator above for exact values and other alloys.
| Size (W × T) | Length | Weight (kg) | Weight (lb) |
|---|---|---|---|
| 50 mm × 6 mm | 6 m | — | — |
| 100 mm × 10 mm | 6 m | — | — |
| 25 mm × 3 mm | 3 m | — | — |
| 2 in × 1/4 in | 10 ft | — | — |
The last row uses Imperial inputs (in/ft) and the same density (2700 kg/m³) after conversion.
How it works
Aluminum flat bar is a rectangular solid. To compute weight, we first compute its volume (Width × Thickness × Length), then multiply by density.
If you switch to Imperial, you can enter width/thickness in inches and length in feet. The calculator converts to meters internally, so the density stays in kg/m³.
For engineering estimates and quotes, theoretical weight is usually enough. For billing and shipping, verify with actual scale weight.
FAQs
What units should I use?
Use either Metric (mm for width/thickness and meters for length) or Imperial (inches and feet). Don’t mix systems unless you convert values first.
Why does alloy matter?
Different aluminum alloys have slightly different densities due to composition. The difference is small (often within a few percent) but can matter for large orders.
Can I calculate by kg/m (weight per meter)?
Yes. Set Length = 1 m in Metric mode (or 3.28084 ft in Imperial mode). The “per piece” result becomes weight per meter.