Metal Weight Calculator
Work out the weight of a machined part or a piece of bar stock from its dimensions — across 50 real grades of aluminium, stainless, steel, titanium, copper, superalloy and engineering plastic. Or flip it round: tell it a weight limit and it tells you how much material you can actually have. No sign-up.
Useful when weight is the constraint — aerospace brackets, drone frames, anything with a mass budget.
We'll tell you the maximum length of that bar within your weight budget — and which grades would let you have more.
How metal weight is calculated
Weight is simply volume × density. The arithmetic is easy; the part people get wrong is the density figure, because it varies by grade rather than by metal. Aluminium 6061-T6 is 2.70 g/cm³ while 7075-T6 is 2.81 — a 4% difference that matters on a mass budget. Stainless 316 is 7.99 but titanium Grade 5 is 4.43, so swapping stainless for titanium takes roughly 45% of the weight out for a like-for-like part.
This calculator uses the density of every grade we actually machine, taken from our own materials guide, so you are not working from a generic "steel = 7.85" assumption. Pick the real grade and the number is right for that grade.
One thing to keep in mind: this gives you the weight of the stock or the solid envelope. A machined part is lighter than the billet it came from, sometimes dramatically so — a pocketed aerospace bracket can finish at a fraction of its starting weight. If you need the finished mass, calculate it from your CAD model volume and use the density figure here.
Metal weight calculator — FAQ
How do you calculate the weight of a metal bar?
Multiply the cross-sectional area by the length to get volume, then multiply volume by the material density. For a round bar: π × (diameter/2)² × length × density. This calculator does it for you using the real density of the specific grade rather than a generic figure.
What is the density of aluminium, steel, stainless and titanium?
Typical values we machine to: aluminium 6061-T6 is 2.70 g/cm³, carbon steel around 7.85 g/cm³, stainless 316/316L is 7.99 g/cm³, and titanium Grade 5 (Ti-6Al-4V) is 4.43 g/cm³. Density varies by grade, which is why this tool lists each grade separately.
Which metal is lightest for a strong part?
For strength-to-weight, titanium Grade 5 and aluminium 7075-T6 are the usual answers. Titanium Grade 5 gives roughly 950 MPa at 4.43 g/cm³; 7075-T6 gives around 572 MPa at 2.81 g/cm³ — lighter still, but less strong and less temperature-capable. Our material selector compares them directly.
Does the calculator give the weight of the finished machined part?
No — it gives the weight of the solid stock or envelope you enter. A machined part is lighter because material has been removed. Use your CAD model volume with the density shown here for a finished-part weight.
Can Dalloway machine parts in these materials?
Yes — we machine all 50 grades listed here in-house on 3, 4 and 5-axis milling and CNC turning, from single prototypes to volume production. Send a drawing for a same-day quote.
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