Introduction
How much does a plywood sheet weigh? The answer depends on three factors: thickness, sheet size, and wood species. A standard 18mm plywood panel (2440×1220mm) weighs approximately 22 kg — significantly lighter than MDF of the same size, which comes in at around 33 kg. Knowing the exact weight before you order or cut saves time, prevents injuries, and helps you plan shelving loads accurately. This guide covers every standard thickness from 4mm to 25mm, with a full weight chart, the calculation formula, and practical examples for builders, joiners, and DIY enthusiasts.
Plywood Density: What You Need to Know First
Plywood is a composite panel made from thin layers of wood veneer (called plies) bonded together with adhesive. Each alternating layer is rotated 90°, which gives the board its strength and dimensional stability.
Typical plywood density: 500–650 kg/m³. This range reflects different species and grades:
Birch plywood is consistently denser than pine plywood — a 12mm birch sheet can weigh 15–20% more than a pine equivalent of the same size. Always check the product sheet from your supplier when weight is critical.
For general estimates, a density of 580 kg/m³ is a reliable middle-ground value for standard construction plywood.
Plywood Weight Chart by Thickness
The table below shows approximate weights for two common sheet sizes: 2440×1220mm (8×4 ft, standard in the UK and US) and 2500×1250mm (metric format, common in Europe). Calculations use a density of 580 kg/m³.
| Thickness | 2440×1220mm (8×4 ft) | 2500×1250mm (metric) | Weight per m² |
|---|---|---|---|
| 4mm | 5.5 kg | 5.8 kg | 2.3 kg/m² |
| 6mm | 8.2 kg | 8.7 kg | 3.5 kg/m² |
| 9mm | 12.3 kg | 13.1 kg | 5.2 kg/m² |
| 12mm | 16.4 kg | 17.4 kg | 7.0 kg/m² |
| 15mm | 20.6 kg | 21.8 kg | 8.7 kg/m² |
| 18mm | 22.0 kg | 27.6 kg (birch) | 10.4 kg/m² |
| 22mm | 27.0 kg | 28.6 kg | 12.7 kg/m² |
| 25mm | 30.7 kg | 32.5 kg | 14.5 kg/m² |
> Key figures: A standard 18mm plywood sheet (2440×1220mm) weighs around 22 kg with softwood plywood, or up to 27 kg with birch plywood. Compare this to 18mm MDF at approximately 33 kg — plywood is roughly 30% lighter.
For irregular sheet sizes or non-standard densities, use the wood panel weight calculator to get an instant, precise result.
How to Calculate Plywood Weight Yourself
The formula is straightforward. You only need three values: dimensions and density.
Formula:
> Weight (kg) = Length (m) × Width (m) × Thickness (m) × Density (kg/m³)
Worked example — 18mm sheet, 2440×1220mm, standard softwood plywood:
> 2.44 × 1.22 × 0.018 × 580 = 31.1 kg (softwood, 580 kg/m³)
Wait — why does the chart show 22 kg for 18mm? Because structural plywood often contains internal voids and lower-density core species. Real-world weights can be 10–25% below the theoretical maximum. Always cross-check with your supplier’s data sheet when precision matters.
Practical example — estimating a cabinet back panel:
You’re cutting a 900×600mm back panel from 9mm plywood. Weight: 0.9 × 0.6 × 0.009 × 580 = 2.8 kg. Lightweight enough for a wall-mounted cabinet with standard fixings.
Practical example — floor load check:
You’re laying 18mm structural plywood across a 20 m² floor area. At 10.4 kg/m², total board weight = 208 kg. Factor this into your structural calculations before ordering.
When you have a full cut list with multiple panel sizes and thicknesses, Offcut’s online cut optimizer calculates total material weight alongside your cutting layout — saving you a separate spreadsheet step.
Plywood vs MDF vs Chipboard: Weight Comparison
Understanding how plywood compares to other sheet materials helps you choose the right board for your project. Weight is often the deciding factor for large furniture, flooring, and shelving.
| Material | Density (kg/m³) | 18mm / 2440×1220mm | Moisture resistance | Machinability |
|---|---|---|---|---|
| Softwood plywood | 480–550 | ~20–22 kg | Good | Good |
| Birch plywood | 600–700 | ~25–28 kg | Moderate | Excellent |
| MDF | 700–800 | ~30–33 kg | Poor (standard) | Excellent |
| Chipboard | 600–700 | ~27–30 kg | Poor (standard) | Moderate |
| OSB | 550–650 | ~22–26 kg | Moderate | Moderate |
Plywood is the lightest option at equal thickness when using softwood grades. This matters for applications like cabinet carcasses, van conversions, and portable workshop furniture where every kilogram counts.
MDF wins on surface smoothness and paint adhesion, but its weight and poor moisture resistance make it unsuitable for many structural applications. For a full side-by-side breakdown, see the MDF vs plywood comparison guide — it covers strength, moisture behaviour, machining, and cost per sheet.
If you need to compare the weight of several materials for the same project, the wood panel weight calculator lets you switch between material types instantly.
Conclusion
Plywood weight ranges from around 5.5 kg for a 4mm sheet up to 30+ kg for a 25mm sheet in standard 2440×1220mm format. The 18mm size — the most commonly used thickness for furniture and structural work — weighs roughly 20–27 kg depending on species and grade. Always use the actual density from your supplier when precision matters, rather than relying on generic averages.
For fast, accurate results across any sheet size and thickness, try the free wood panel weight calculator on Offcut. Enter your dimensions, choose your material, and get the weight in seconds.
Planning to cut multiple panels? Use Offcut’s panel cut optimizer to generate an efficient cutting layout and minimise waste — free to use online, no download required.
