📏 PE Bag 4-Parameter Calculator
Enter any 3 parameters — length, width, weight, or thickness — and we'll calculate the 4th. Density is fixed at 0.94 g/cm³ (standard LDPE).
🔬 Material Constant
⚖️
PE Density = 0.94 g/cm³
— Standard low-density polyethylene (LDPE). HDPE = 0.96 g/cm³ varies slightly but the calculator uses 0.94 for general PE bag estimation.
🧮 Bag Parameter Calculator
cm — bag flat length (open side to bottom)
cm — bag flat width (side to side)
grams — weight of one bag
μm (microns) — film thickness
🔬 Verification test: L=10 cm, W=10 cm, Weight=1.0 g → Thickness should be ≈106.4 μm
📐 Formula & How It Works
Core Formula:
Where:
• Length × Width = bag flat area (single layer)
• Thickness = film gauge (converted from μm to cm: ÷10,000)
• Density = 0.94 g/cm³ (LDPE / LLDPE standard)
• Weight = calculated mass of one bag
This is a single-layer flat bag model. For gusset bags or multi-layer structures, the actual weight may differ — use this as an estimation tool.
Weight (g) = Length (cm) × Width (cm) × Thickness (cm) × Density (g/cm³)Where:
• Length × Width = bag flat area (single layer)
• Thickness = film gauge (converted from μm to cm: ÷10,000)
• Density = 0.94 g/cm³ (LDPE / LLDPE standard)
• Weight = calculated mass of one bag
This is a single-layer flat bag model. For gusset bags or multi-layer structures, the actual weight may differ — use this as an estimation tool.
🔄 Thickness Unit Converter μm ↔ mm ↔ 丝 ↔ mil
Enter any thickness to see equivalents in all four units. Click a result to copy it.
50.00
μm (micron)
5.00
丝 (si) — China
0.05
mm
1.97
mil — US/UK
| μm | mm | 丝 (si) | mil | Feel / Typical Use |
|---|---|---|---|---|
| 10 | 0.010 | 1.0 | 0.39 | Ultra-thin — dry cleaning / produce bags |
| 20 | 0.020 | 2.0 | 0.79 | Light — grocery / shopping bags |
| 30 | 0.030 | 3.0 | 1.18 | Standard retail / T-shirt bags |
| 50 | 0.050 | 5.0 | 1.97 | General purpose — balance of strength & cost |
| 75 | 0.075 | 7.5 | 2.95 | Heavy — mailing / hardware bags |
| 100 | 0.100 | 10.0 | 3.94 | Sturdy — thick file bags / industrial parts |
| 150 | 0.150 | 15.0 | 5.91 | Extra heavy — large parts / packaging |
| 200 | 0.200 | 20.0 | 7.87 | Very thick — pallet covers / heavy liners |
Need help choosing the right thickness or size for your product? Talk to us →
⚠️ This calculator provides estimates based on standard LDPE density (0.94 g/cm³). Actual bag weight may vary depending on material formulation, printing, and manufacturing tolerances. Always request a physical sample for final specification verification.