Weight calculator for steel, stainless and special alloys

Theoretical weight of bars, pipes, plates, blocks, discs, rings, stepped shafts and pins with the real density of each alloy.

With "Include forging allowance" ticked, the calculator adds Dustre's INF 002 allowance (round bar, square bar and disc) to the finished dimensions and shows the weight of the forging. Full tables, including cutting and machining, in supply tolerances.

Densities used

Same list as the materials. Density from each material's data sheet; for family guides, the typical value of the alloy.

See the density of each material (97 alloys)

Material	Density (g/cm³)
Carbon and alloy steels
300M steel (modified 4340)	7.85
SAE 4140	7.85
SAE 4340	7.85
8550 steel – 34CrAlNi7-10 (W.Nr. 1.8550)	7.85
ASTM A105 – Forged carbon steel for piping	7.85
ASTM A182 F1	7.85
ASTM A182 F5	7.8
ASTM A182 F9	7.75
ASTM A182 F11 Class 2	7.85
ASTM A182 F22 / P22 (2¼Cr-1Mo)	7.85
ASTM A182 F91 Type 1	7.77
ASTM A522 Type I – 9% Ni steel	7.86
ASTM A694 F65 – High-yield steel forging	7.85
Maraging 250	8.03
SAE 9315 – AMS 6263	7.85
Stainless steels
15-5PH – UNS S15500 (XM-12)	7.78
17-7PH – UNS S17700 (Type 631)	7.81
254 SMO / F44	8
A-286 / Alloy 660	7.94
17-4PH stainless steel – UNS S17400 (ASTM A564 Type 630)	7.78
304L stainless steel	7.9
310S stainless steel	7.9
316Ti stainless steel	8
317L stainless steel	8
321 stainless steel	7.92
347 stainless steel	7.96
904L stainless steel	7.95
F138 stainless steel (316LVM)	8
AISI 403	7.75
AISI 416	7.75
AISI 431	7.7
AISI 446	7.5
Alloy 20 (Carpenter 20)	8.08
Alloy 28	8
ASTM A182 F6NM	7.7
316 / 316L stainless	7.98
Nitronic 50 (XM-19)	7.88
Nitronic 60	7.62
Duplex
Duplex 2205 (F51 / S31803)	7.8
Duplex S32205 / F60	7.8
Ferralium 255 / F61	7.81
329 stainless steel	7.8
Super duplex 2507 / F53 / S32750	7.8
Super duplex Zeron 100 / F55 / S32760	7.84
Nickel alloys
Hastelloy B-2	9.22
Hastelloy C-4	8.64
Hastelloy C-22	8.69
Hastelloy C-276	8.89
Incoloy 800HT	7.94
Incoloy 825	8.14
Incoloy 925	8.08
Inconel 600	8.47
Inconel 601	8.11
Inconel 625 / Alloy 625	8.44
Inconel 718	8.19
Monel 400	8.8
Monel K-500	8.44
Nickel 200	8.89
Titanium
Titanium Grade 2	4.51
Titanium Grade 5 (Ti-6Al-4V)	4.43
Titanium Grade 7 (Ti-0.15Pd)	4.51
Titanium Grade 9 (Ti-3Al-2.5V)	4.48
Copper and copper alloys
Cast aluminum bronze C95400	7.45
Nickel-aluminum bronze C63000	7.58
SAE 660 bronze	8.91
TM23 bronze – high-lead bearing bronze	9.03
Beryllium copper C17200	8.26
Low-beryllium copper C17510	8.77
Chromium copper C18200	8.89
Chromium-zirconium copper C18150	8.89
70/30 copper-nickel C71500	8.94
90/10 copper-nickel C70600	8.94
Naval brass C46400	8.41
Engineering plastics
Cast nylon (PA6 G) – natural, oil-filled and MoS₂-filled	1.15
Extruded nylon PA6 and PA66 (polyamide)	6
PAI (Torlon® 4301) – polyamide-imide	1.45
PC – polycarbonate	1.19
HDPE – high-density polyethylene (PE 300 / PE 500)	0.95
PEEK – polyether ether ketone	1.31
Reinforced PEEK – GF30, CF30 and bearing grade	1.4
PEI (Ultem®) – polyetherimide	1.28
PET-C (Ertalyte®) – semi-crystalline polyester, natural and PTFE-filled	1.39
PI – polyimide (Vespel®, TECASINT, Duratron PI)	1.38
Polyacetal (POM, Delrin®) – copolymer and homopolymer	1.41
PP – polypropylene homopolymer	0.9
PPS – polyphenylene sulfide	1.35
PTFE with 25% glass fiber	2.24
Bronze-filled PTFE (40% and 60%) – bronze Teflon	1.4
Carbon- and graphite-filled PTFE (25% C and 15% graphite)	1.4
Virgin PTFE (Teflon®) – polytetrafluoroethylene	2.15
PVDF – polyvinylidene fluoride	1.78
UHMW – ultra-high molecular weight polyethylene (PE 1000)	0.93
Others
18Ni maraging steel	8
Electrolytic copper	8.94
410 stainless	7.75
420 stainless	7.75
440C stainless	7.7

Frequently asked questions

How do I calculate the weight of a round bar?

Weight in kg/m = π/4 × d² × density / 1,000, with d in mm and density in g/cm³. A Ø 50 mm bar in 316L stainless weighs about 15.67 kg/m.

Is the calculated weight the actual weight?

It is the theoretical weight. Rolled and forged bars have machining allowance and positive tolerance, so the actual weight is usually a little higher.