Materials & compliance
How do you calculate the weight of a plastic sheet or roll?
Short answer
Weight = area × thickness × density. In practice, grams per square metre = thickness in microns × density in g/cm³. APET is about 1.33–1.35 g/cm³, so 300-micron APET weighs about 400 g/m². A roll 600 mm wide and 500 m long of that sheet weighs about 0.6 × 500 × 0.4 ≈ 120 kg. Ask AVI for the exact density of your grade.
Part of the guides: PET and rPET: the material guide and PVC, blister and specialty films guide
- Formulag/m² = microns × density
- APET densityabout 1.33–1.35 g/cm³
- 300 µm APETabout 400 g/m²
AVI's sheet
- PET Sheet Manufacturer — APET, rPET, PETG & MorePET sheet manufacturer in India: APET, rPET (30–100% recycled), PETG, GAGPET, ESD and laminated PET sheets and rolls...
- PVC Film Manufacturer — AVI Blis, Form, Print, Box, Lam & Card6 PVC film grades from AVI Global Plast — AVI Blis, Box, Form, Lam, Print and Card — 10,000 TPA capacity for pharma,...
The formula
Weight (g) = length (m) × width (m) × thickness (µm) × density (g/cm³)
That works because 1 m² of sheet 1 micron thick and density 1 g/cm³ weighs exactly 1 g.
Worked examples
| Sheet | Thickness | Density | Weight per m² |
|---|---|---|---|
| APET | 300 µm | 1.34 | 402 g |
| PETG | 500 µm | 1.27 | 635 g |
| Rigid PVC | 250 µm | 1.38 | 345 g |
A roll: 0.6 m wide × 500 m long × 402 g/m² = 120.6 kg.
Why it matters
Sheet is sold by weight but used by area, so the calculation tells you how many packs a roll yields, and plastic taxes and EPR fees are charged by weight too.
Related questions
What are typical densities?
APET about 1.33–1.35 g/cm³, PETG about 1.27, rigid PVC about 1.35–1.40, PP about 0.90. Grade data sheets give the exact figure.
How do I work out roll length from weight?
Length (m) = roll weight (kg) ÷ (width in m × weight per m² in kg). For 120 kg of 0.6 m wide, 0.4 kg/m² sheet: 120 ÷ 0.24 = 500 m.