Metal Bar Weight
Calculator
Results
- Volume (m³)
- 0.0005
- Mass (kg)
- 3.925
- Mass (lb)
- 8.653143
- Mass per metre (kg/m)
- 3.925
Results
| Volume (m³) | 0.0005 |
| Mass (kg) | 3.925 |
| Mass (lb) | 8.653143 |
| Mass per metre (kg/m) | 3.925 |
formula-map diagram
- Volume (m³)
- 0.0005
- Mass (kg)
- 3.925
- Mass (lb)
- 8.653143
- Mass per metre (kg/m)
- 3.925
Formula map
Formula
m = L × W × T × ρ= 0.0005
Note
This result is a simplified model; verify against your shop's own tolerances and material data before cutting.
More in Woodworking and metalwork
See all →Frequently asked questions
How is a metal bar's weight calculated?+
Weight equals the bar's cross-sectional area multiplied by its length, multiplied by the material's density. The cross-sectional area formula depends on the bar's shape: width times thickness for a flat or square bar, pi times radius squared for round bar.
Why does the material selection matter so much for the result?+
Density varies enormously between metals: steel is about 7.85 g/cm3, aluminum about 2.7 g/cm3, and brass about 8.4-8.7 g/cm3, so identical bar dimensions in different materials can differ in weight by a factor of three or more.
Does bar shape (round vs. square vs. hex) change the formula?+
Yes, only the cross-sectional area formula changes; the rest of the calculation (area x length x density) stays the same. A round bar of a given diameter weighs noticeably less than a square bar of the same width, because a circle covers less area than a square of the same span.
Why would I calculate bar weight before cutting or ordering material?+
Suppliers often price bar stock by weight rather than length, so knowing the expected weight lets you estimate material cost. It also matters for shipping cost, and for confirming a design's load or handling assumptions before fabrication.
Are published density values exact for every alloy?+
No, density varies slightly between specific alloys within the same metal family (different steel or aluminum alloys, for instance), so for precision work you should use the density of your exact alloy rather than a generic figure for 'steel' or 'aluminum.'