How do I calculate the weight of a carbon fiber tube, sheet or fabric roll?

Weight is volume times density. For cured carbon fiber laminates, use about 1.6 g/cm³^[1]. Our 600 g twill prepreg confirms it: 1,034 g/m² at 0.65 mm per ply works out to 1.59 g/cm³^[2]. So a 1000 × 1000 × 2 mm carbon sheet weighs about 3.2 kg, and a 20/18 mm tube about 95 g per meter.

1.6 g/cm³density of a cured carbon laminate

3.2 kg1000 × 1000 × 2 mm sheet

95 g/m20/18 mm round tube

20 kg100 m roll of 200 g/m² fabric, 1 m wide

The three formulas

Item	Formula	Units
Round tube	weight (g) = π ÷ 4 × (OD² − ID²) × length × density ÷ 1000	mm, mm, g/cm³
Sheet	weight (g) = length × width × thickness × density ÷ 1000	mm, g/cm³
Fabric roll	weight (kg) = areal weight × width × roll length ÷ 1000	g/m², m, m

Our weight calculator does the tube and fabric versions for you^[3].

Worked example: a sheet

A 500 × 500 × 3 mm sheet: 500 × 500 × 3 = 750,000 mm³ = 750 cm³. 750 × 1.6 = 1,200 g, so about 1.2 kg.

Standard 3K T300 sheet^[4]	1 mm	2 mm	3 mm	4 mm	5 mm
500 × 500 mm	0.40 kg	0.80 kg	1.20 kg	1.60 kg	2.00 kg
600 × 500 mm	0.48 kg	0.96 kg	1.44 kg	1.92 kg	2.40 kg
800 × 800 mm	1.02 kg	2.05 kg	3.07 kg	4.10 kg	5.12 kg
1000 × 1000 mm	1.60 kg	3.20 kg	4.80 kg	6.40 kg	8.00 kg

1000 × 1000 mm sheet weight by thickness

1 mm1.6 kg

2 mm3.2 kg

3 mm4.8 kg

4 mm6.4 kg

5 mm8.0 kg

Carbon fiber sheet on a CNC cutting table — Weigh the sheet, not the parts: CNC parts need the nested sheet weight for freight.

Worked example: a tube

A 16/14 mm tube, 1000 mm long: π ÷ 4 × (256 − 196) = 47.1 mm² cross-section. 47.1 × 1000 = 47,100 mm³ = 47.1 cm³. 47.1 × 1.6 = 75 g.

Standard tube (OD/ID, mm)^[5]	Weight per meter
6/4	25 g
8/6	35 g
10/8	45 g
12/8	101 g
14/12	65 g
16/14	75 g
16/12	141 g
20/18	95 g

Worked example: a fabric roll

200 g/m² 3K fabric, 1 m wide^[6], 100 m roll: 200 × 1 × 100 ÷ 1000 = 20 kg of fabric, plus the core and packaging.

Carbon fiber fabric close-up — Fabric is sold by areal weight in g/m².

Carbon fiber round tubes — Tube weight scales with the cross-section area.

TipYour calculation gives net weight. For freight, add packaging: tubes and sheets ship in cartons or on pallets^[7], which add weight and, for long tubes, volume. Couriers charge by volumetric weight when that is higher.

Why might a real part weigh a little more or less?

Resin content: more resin adds weight and thickness, while density drops slightly, because epoxy is lighter than carbon fiber.
Thickness tolerance: a nominal 2 mm sheet can be slightly thicker or thinner.
Foam or wood cores make sandwich panels much lighter than solid carbon.

Ask for the measured weight of a sample if you need exact figures. Send sizes and quantities through the quote form and we will include gross and net weights.