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PEEK weight calculator
Mass is volume times density. Enter a rod, plate or tube blank, pick the grade and read the mass as a range, because density differs by a few percent between makers. Use it to size a blank, check a stock quote sold by the kilo or estimate shipping weight.
Formulas
- RodVolume = π / 4 × D² × L, with D the diameter and L the length.
- Plate or barVolume = W × T × L, the three edges of the blank.
- TubeVolume = π / 4 × (OD² − ID²) × L.
- MassWith dimensions in mm, volume in mm³ divided by 1,000 gives cm³, and cm³ times density in g/cm³ gives grams.
Worked example
A 50 mm diameter rod, 300 mm long, in unfilled PEEK. Volume = π / 4 × 50² × 300 = 589,049 mm³ = 589.05 cm³. At 1.30 g/cm³ that is 765.7 g, and at 1.32 g/cm³ it is 777.5 g. A quote for one blank should therefore land near 0.77 to 0.78 kg of material, before any cutting allowance the shop adds.
A 300 × 200 × 20 mm GF30 plate is 1,200 cm³. At 1.49 g/cm³ that is 1,788 g, and at 1.53 g/cm³ it is 1,836 g.
Density figures behind the calculator
| Grade | Product | Density (g/cm³) | Test method | Source |
|---|---|---|---|---|
| Unfilled | VICTREX PEEK 450G (granule) | 1.30 | ISO 1183 | maker page |
| Unfilled | TECAPEEK natural (stock shape) | 1.31 | not stated on page | maker page |
| GF30 | VICTREX PEEK 450GL30 (granule) | 1.51 | ISO 1183 | maker page |
| GF30 | TECAPEEK GF30 natural (stock shape) | 1.53 | not stated on page | maker page |
| CF30 | VICTREX PEEK 450CA30 (granule) | 1.40 | ISO 1183 | maker page |
| CF30 | TECAPEEK CF30 black (stock shape) | 1.38 | not stated on page | maker page |
| Bearing | TECAPEEK PVX black (10% PTFE, 10% graphite, 10% carbon fibre) | 1.44 | not stated on page | maker page |
Source line: Victrex datasheets for PEEK 450G, 450GL30 and 450CA30, and Ensinger product pages for TECAPEEK natural, GF30 natural, CF30 black and PVX black, read in October 2026. Victrex lists its figure as crystalline density on resin granules, so a machined stock shape from another maker can differ. The bands used in the calculator are 1.30 - 1.32 (unfilled), 1.49 - 1.53 (GF30), 1.38 - 1.44 (CF30) and 1.44 - 1.46 (bearing). They widen the property table band so that every figure above falls inside it.
How to read the result
The calculator returns a range, not a single weight. Density in a datasheet is a typical value for one maker and one test, and stock from two makers of the same grade can differ by a percent or two. Where the range is a problem, such as a weight limit on a shipped assembly, take the density from the datasheet of the stock your shop will actually cut and use the custom option.
The result is the mass of the blank as you describe it. Rod and plate stock is supplied oversize so that the part can be machined and any residual stress cut away, and the shop also adds length for the clamping and the parting off. Ask the shop for the stock size it will quote, enter that, and compare with the finished part mass to see the removal share. A high removal share on filled grades is why the price of the blank often outweighs the machining time: see what drives PEEK machining cost.
A common mistake is mixing grades. With the Victrex figures above, a GF30 blank weighs about 16 percent more than the same unfilled blank (1.51 against 1.30 g/cm³), which shows up in a stock quote sold by the kilo. For the rest of the datasheet, see how to read a PEEK datasheet.
On a drawing or RFQ, write the grade and the maker datasheet you expect, the blank size you assume and the number of parts. That lets each shop price the same stock.
Send the part and get quotes from shops that cut PEEK: send the drawing.