ENGINEERING CALCULATOR
Material Weight Calculator
Calculate the weight of any part or stock from its material and dimensions. Select an alloy and shape, enter dimensions, and get per‑piece and total weight in seconds — with the formula shown so you can trace every number.
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Free Online Tool
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Raw Stock vs. Finished Weight
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Material Cost Estimate
Material Weight Calculator
Select material and shape, enter dimensions to calculate weight.
Volume
50,000 mm³
Weight
0.3925 kg
Density
2.70 g/cm³
Formula
Weight = L × W × H × ρ ÷ 1,000,000
Engineering Calculator
Material Weight Calculator
Select shape and material, enter dimensions, then click Calculate to see the weight and material cost.
Volume
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Density
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Weight / Piece
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Total Weight
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Formula
Enter values and press Calculate.
HOW IT WORKS
How to Calculate Material Weight
Learn how material weight is calculated using density, volume, and shape geometry, plus the difference between raw stock and finished part weight.
Material Weight Formula
Weight = Density × Volume
Weight in kg = L × W × H × ρ ÷ 1,000,000
Where L,W,H in mm and ρ in g/cm³
Volume by Shape
Rectangular: L×W×H · Round: π·(D/2)²·L
Tube: π·(R₁²−R₂²)·L
Sheet: L×W×T (same as block)
Worked Example
A steel block measuring 100 × 50 × 10 mm has a volume of 50,000 mm³, or 50 cm³. Carbon steel density is 7.85 g/cm³.
50 × 7.85
Volume × Density
=
392.5 g
Mass
=
0.3925 kg
Weight
Steel Weight
0.3925 kg
Aluminum (6061)
0.135 kg
Weight Difference
65% lighter
The Three Steps to Calculate Material Weight
01
Compute Volume
Calculate the volume of the part or stock from its dimensions using the appropriate shape formula.
V = L×W×H (rectangular)
02
Multiply by Density
Multiply the volume by the material density to get the mass. Density depends on the material alloy and grade.
Mass = V × ρ
03
Add Quantity & Cost
Multiply by quantity for total batch weight. Optionally multiply by price per kg for material cost.
Total = Mass × QtyRaw Stock vs. Finished Part Weight
Raw Stock Weight
The solid-block weight is what you are charged for at the material counter and what feeds your material cost estimate.
Finished Part Weight
Machining removes 15 to 40% of material through holes, pockets, and chamfers. The finished part is what you quote for shipping and weight budgets.
Material Cost
Once you have weight, cost is a single multiplication: weight × price per kg. Use the calculator’s optional price input for a budget number before quoting.
MACHINING APPLICATIONS
Why Part Weight Matters in Machining
Part weight affects material cost, shipping, structural design, and machining strategy. Here is why it matters at every stage of your project.
Part weight shows up in four places that directly affect your project: material cost and quoting, shipping and logistics, structural and weight budgets, and material removal planning. Understanding these impacts helps you make better design and sourcing decisions.
Material Cost & Quoting
Raw stock is sold by weight, so the weight of your billet, bar, or plate sets the material line on your quote. Upload your CAD file for a live price and lead time in about 60 seconds.
- Accurate material cost estimates
- No hidden material charges
- Transparent quoting process
Shipping & Logistics
Freight is billed by weight. The difference between a solid block and a finished part can be substantial on a production run, so knowing finished weight helps you forecast accurately.
- Accurate freight forecasting
- Carrier cost comparison
- Production run logistics
Structural & Machining Strategy
In aerospace and robotics, every gram counts. Weight also drives material removal planning — comparing raw stock to finished weight reveals machining time and cost.
- Weight-driven material selection
- Removal time estimation
- CNC machining to ±0.001″
Material Weight Questions
Material Weight FAQs
Multiply the part’s volume by its material density: weight = density × volume. For a rectangular block, volume is length × width × height. For other shapes, use the standard geometry formula, then multiply by density.
Carbon steel is about 7.85 g/cm³ (0.284 lb/in³). Stainless steel runs slightly higher at 7.93 to 8.00 g/cm³ depending on grade, with 304 at 7.93 and 316 at 7.98.
One millimeter of mild steel sheet weighs about 7.85 kg per square meter. A 2440 × 1220 × 2 mm sheet, roughly an 8 by 4 foot panel at 2 mm, weighs about 47 kg.
Yes, often by 15 to 40%. Holes, pockets, chamfers, and threads remove material during machining, so the finished part is lighter than the block it started as. The calculator’s finished part mode accounts for this with your removal estimate.
Within a few percent for solid stock. Actual weight varies slightly with the specific alloy and rolling tolerance, and coatings add negligible weight. For complex shapes, use the finished part mode or let your CAD software compute mass from the model.
Aluminum is about one third the weight of steel at the same volume (2.70 versus 7.85 g/cm³), so switching from steel to aluminum 6061 cuts part weight by roughly 65%. Run the same dimensions through a steel weight calculator and an aluminum weight calculator and the gap is immediate: identical geometry, one third the mass. The trade-off is that steel carries higher strength and stiffness per unit of volume.
Use the density in lb/in³, about 0.284 for steel and 0.0975 for aluminum, and multiply by the volume in cubic inches. The calculator does this conversion for you in imperial display mode.
PRECISION MANUFACTURING SUPPORT
From Weight to Machined Part
You have a weight. Now you need the part. Whether you calculated raw stock for costing or finished weight for shipping, the next step is the same: turn your design into a machined part that holds its tolerances.
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Precision 5‑axis CNC machining to ±0.001″
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50+ metals & plastics, ISO 9001 & AS9100
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No minimum order, standard parts in 3–7 days