How accurate is this calculator?

The calculator uses average air-dried density values for each species. Actual weight varies with moisture content, grain pattern, and growing conditions. Freshly felled timber can weigh 50–100% more than kiln-dried stock due to water content.

What moisture content are the density values based on?

The listed densities are for air-dried timber at approximately 12% moisture content, which is the standard for kiln-dried joinery-grade timber in the UK. Green (freshly cut) timber has much higher moisture content and weighs significantly more.

Why do I need to know wood weight?

Wood weight matters for transport (vehicle load limits), structural design (dead loads on shelves and supports), shipping costs, and workshop safety (handling heavy pieces). Knowing the weight also helps estimate drying times.

Which wood species is heaviest?

Among common woodworking species, ebony (950 kg/m³) and lignum vitae (1,230 kg/m³) are the heaviest. Among domestic UK species, oak (530 kg/m³) is relatively heavy. Cedar (320 kg/m³) and spruce (350 kg/m³) are among the lightest.

WoodCalcs

Wood Weight Calculator — Estimate Timber Weight

Estimate the weight of timber based on wood species and dimensions. Useful for transport and structural planning.

Wood Species

Thickness

Width

Length

Quantity

How We Calculate This

This calculator estimates wood weight using the relationship between volume and density.

The formula

Weight (kg) = Volume (m³) × Density (kg/m³)

Volume is calculated as thickness × width × length (all in mm), then divided by 10&sup9; to convert to cubic metres.

About wood density

Wood density varies by species and is measured at a standard moisture content of 12%. The density figures used here are average values — individual boards can vary by ±10% depending on growth conditions and the part of the tree the board came from.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.