Free tool
Tungsten copper weight calculator
Calculate W/Cu electrode wheels, rods and blocks from dimensions and density using our typical 75/25 or 70/30 values. The same geometry also works as a carbide weight calculator when you enter the density published for your exact tungsten-carbide or cemented-carbide grade.
Estimated finished weight
0.00 kg
0 g · volume 0 cm³
Using the typical W/Cu 75/25 density of 15.2 g/cm³.
How it works
- · Nominal dimensions × typical grade density (75/25 ≈ 15.2 g/cm³, 70/30 ≈ 14.5 g/cm³ — see FAQ specs).
- · For a carbide weight calculation, choose the custom option and enter the density for the named carbide grade. The geometry calculation does not change.
- · Machined features such as bores, edge profiles and chamfers remove material. Deduct those volumes or treat the solid-shape result as an upper estimate.
- · For quotation-exact weights, send us the drawing — formal quote within one business day.
Reference table
Standard sizes, already worked out
Nominal weights for the wheel and rod sizes we cut most often, calculated from the same densities the calculator uses. Treat them as a sanity check on a quote or a fast mass estimate on the shop floor.
Electrode wheels (disc)
| OD × thickness | Volume | 75/25 | 70/30 |
|---|---|---|---|
| 100 × 20 mm | 157 cm³ | 2.4 kg | 2.3 kg |
| 150 × 25 mm | 442 cm³ | 6.7 kg | 6.4 kg |
| 200 × 30 mm | 942 cm³ | 14.3 kg | 13.7 kg |
| 250 × 40 mm | 1,963 cm³ | 29.8 kg | 28.5 kg |
| 300 × 50 mm | 3,534 cm³ | 53.7 kg | 51.2 kg |
| 350 × 60 mm | 5,774 cm³ | 87.7 kg | 83.7 kg |
| 400 × 60 mm | 7,540 cm³ | 114.6 kg | 109.3 kg |
Rods (100 mm length)
| Diameter × length | Volume | 75/25 | 70/30 |
|---|---|---|---|
| Ø20 × 100 mm | 31 cm³ | 0.48 kg | 0.46 kg |
| Ø30 × 100 mm | 71 cm³ | 1.07 kg | 1.02 kg |
| Ø40 × 100 mm | 126 cm³ | 1.91 kg | 1.82 kg |
| Ø50 × 100 mm | 196 cm³ | 2.98 kg | 2.85 kg |
| Ø63 × 100 mm | 312 cm³ | 4.74 kg | 4.52 kg |
| Ø80 × 100 mm | 503 cm³ | 7.64 kg | 7.29 kg |
For any length, scale linearly: a Ø50 rod weighs 0.0298 kg per mm of length in 75/25.
The formula behind it
Volume of a disc or rod is π/4 × d² × h; for a block it is l × w × h. Divide by 1,000 to convert mm³ to cm³, multiply by the grade density, then divide by 1,000 again for kilograms. In one line for a wheel:
weight_kg = 0.0007854 × OD² × thickness × density / 1000
With OD and thickness in millimetres and density in g/cm³. That is exactly what this page runs — nothing hidden, no rounding before the final step.
Density table
Density inputs: copper tungsten and carbide
The W/Cu values below are ArcTung's typical grade inputs. Carbide is different: use the density attached to the exact tungsten-carbide or cemented-carbide grade you are calculating.
| Material | g/cm³ | lb/in³ | Note |
|---|---|---|---|
| W/Cu 75/25 | 15.2 | 0.549 | Stocked |
| W/Cu 70/30 | 14.5 | 0.524 | Stocked |
| Tungsten carbide / cemented carbide | Enter grade value | Convert if needed | Supplier-specific input |
Infiltrated CuW density shifts with composition and porosity, so treat the stocked-grade figures as typical values. A per-batch density report ships with ArcTung material on request. For carbide, use the value published for the specific grade and binder system.
Weight per metre of round bar
| Diameter | 75/25 | 70/30 |
|---|---|---|
| Ø12 mm | 1.72 kg/m | 1.64 kg/m |
| Ø16 mm | 3.06 kg/m | 2.92 kg/m |
| Ø20 mm | 4.78 kg/m | 4.56 kg/m |
| Ø25 mm | 7.46 kg/m | 7.12 kg/m |
| Ø30 mm | 10.74 kg/m | 10.25 kg/m |
| Ø40 mm | 19.10 kg/m | 18.22 kg/m |
| Ø50 mm | 29.85 kg/m | 28.47 kg/m |
| Ø63 mm | 47.38 kg/m | 45.20 kg/m |
| Ø80 mm | 76.40 kg/m | 72.88 kg/m |
Buying bar stock? Multiply by the length you need. A 300 mm cut of Ø40 in 75/25 is 19.10 × 0.3 ≈ 5.7 kg.
FAQ
Calculator questions
How accurate is this weight calculator?
It multiplies nominal volume by the selected density. For W/Cu, the presets use our typical grade values (75/25 ≈ 15.2 g/cm³ and 70/30 ≈ 14.5 g/cm³). For tungsten carbide or cemented carbide, enter the density stated for the specific grade by its manufacturer or material certificate. Bores, profiles, chamfers and other removed material must be deducted for a finished-part estimate.
Why does weight matter for pricing?
Tungsten is a commodity material, so CuW pricing tracks weight. Volume breaks apply from 20 kg — the calculator flags when your batch crosses that line so you know you are past the first discount tier.
Can I get a price from this weight?
Quotes are held for 7 days and follow the tungsten market, so we do not publish a fixed $/kg. Send the calculated weight with your drawing via the contact page and you will have a formal quotation — FOB Shenzhen/Nansha — within one business day.
Can I use this as a carbide weight calculator?
Yes. The wheel, rod and block geometry is the same for tungsten carbide and cemented carbide; only the density input changes. Select the carbide/custom option and enter the density for your exact grade from its supplier datasheet or material certificate. Binder type and content affect cemented-carbide density, so this page does not assume one universal carbide value. ArcTung supplies W/Cu 75/25 and 70/30, not carbide.
Can I calculate from a density in lb/in³?
The custom field takes g/cm³. Convert the grade density from lb/in³ by multiplying it by 27.6799, then enter the result. Use the value from the carbide grade supplier rather than a generic web table.
The drawing gives me a volume, not dimensions. What now?
Multiply directly: kilograms = volume in cm³ × density / 1,000. For pounds, divide the kilogram result by 0.4536. If the volume is in cubic inches, multiply by 16.387 first to get cm³.