HDPE Weight Calculator

HDPE (High-Density Polyethylene) has a density of approximately 0.95 g/cm³ or 59.3 lb/ft³. This can vary slightly between grades, typically ranging from 0.93 to 0.97 g/cm³ depending on the manufacturing process and additives used.

Measure length and width at multiple points since HDPE sheets can warp slightly. Use calipers or a micrometer for thickness, as this dimension has the biggest impact on weight accuracy. Always measure in the same units to avoid conversion errors.

Variations occur due to different HDPE grades, manufacturing tolerances, and moisture absorption. Commercial HDPE sheets typically have a ±10% thickness tolerance, which directly affects weight. Recycled HDPE may also have slightly different density than virgin material.

Sheets are thin, flat pieces where thickness is much smaller than length and width. Blocks are three-dimensional with comparable height, length, and width dimensions. The weight calculation is the same (volume × density), but the terminology helps clarify the shape you're working with.

This calculator is optimized for HDPE at 0.95 g/cm³. LDPE (Low-Density Polyethylene) is lighter at 0.91-0.93 g/cm³, while UHMWPE is similar to HDPE. For accurate results with other plastics, use their specific density values in a custom calculation.