A plywood weight calculator takes the guesswork out of loading, shipping, and carrying sheet goods. Whether you're planning a freight order or figuring out if one person can lift a panel, the sheet weight matters. Enter your panel size, the nominal thickness printed on the sheet or a measured actual thickness, the product type, and the sheet count; the tool returns pounds, kilograms, and surface weight density.
From panel type and thickness to pounds per sheet
Sheet weight is volume times density: convert length, width, and actual thickness to feet, multiply the three for cubic feet, then multiply by the grade's density in . A 96 by 48-inch sheet of 3/4-inch CDX softwood corrects to a 23/32-inch (0.71875 ) actual thickness, so (96 / 12) x (48 / 12) x (0.71875 / 12) x 35 = 1.917 x 35 = about 67.08 per sheet. Stack twelve for a trailer deck and that is about 805 (365 ); kilogram outputs are exact conversions of the same pounds. The chart and sections below are that one formula applied to real panels, thicknesses, and loads.
Density is the biggest driver: CDX softwood is about 35 , OSB 42, hardwood-faced 46, and MDF 48. Pick the real grade — a hardwood-faced panel weighs roughly 1.3 times a softwood sheet the same size, not double.
A panel stamped 3/4 is milled to about 23/32 . Nominal mode applies that APA undersize for you; for a measured panel or a true-metric sheet like 18 Baltic birch, use the actual-thickness modes instead.
Figures assume stock near 12 equilibrium moisture. Rain-soaked or freshly pressure-treated panels run heavier, so read every number as a conservative planning weight, not a certified mill value.
Plywood weight chart by thickness and panel type
Every cell below is this calculator's own output, so the chart and the tool always agree. Imperial rows use a full 4x8 sheet (96 x 48 ) at the APA Performance Category actual thickness — nominal minus the standard undersize — except the 7/16 sheathing row, which is milled to its full nominal thickness. Columns use CDX/softwood 35 , OSB 42, hardwood-faced 46, and MDF 48.
| Nominal (actual) | CDX / softwood | OSB | Hardwood | MDF |
|---|---|---|---|---|
| 1/4 (7/32) | 20.4 | 24.5 | 26.8 | 28.0 |
| 3/8 (11/32) | 32.1 | 38.5 | 42.2 | 44.0 |
| 7/16 (7/16) | 40.8 | 49.0 | 53.7 | 56.0 |
| 1/2 (15/32) | 43.8 | 52.5 | 57.5 | 60.0 |
| 5/8 (19/32) | 55.4 | 66.5 | 72.8 | 76.0 |
| 3/4 (23/32) | 67.1 | 80.5 | 88.2 | 92.0 |
| 1 (31/32) | 90.4 | 108.5 | 118.8 | 124.0 |
The metric companion answers "12mm plywood weight" or "18mm in kg" directly: each cell is the kilogram output for a full 2440 x 1220 sheet at the listed millimeter thickness — no hand conversion required.
| Thickness | CDX / softwood | OSB | Hardwood | MDF |
|---|---|---|---|---|
| 6 | 10.0 | 12.0 | 13.2 | 13.7 |
| 9 | 15.0 | 18.0 | 19.7 | 20.6 |
| 12 | 20.0 | 24.0 | 26.3 | 27.5 |
| 15 | 25.0 | 30.0 | 32.9 | 34.3 |
| 18 | 30.0 | 36.0 | 39.5 | 41.2 |
| 25 | 41.7 | 50.1 | 54.8 | 57.2 |
Why these can read higher than other charts: retail listings often quote lighter numbers — about 60 for a 3/4 softwood sheet against the 67.1 here — because they assume a lighter species mix and drier stock, while this tool uses a conservative planning density. OSB and MDF are frequently milled close to their full labeled thickness, so real sheets in those columns can run a few heavier than the APA-undersized figure. Read every number as a planning estimate, not a certified mill weight.
Is OSB heavier than plywood, and why?
Yes, at the same thickness. OSB averages about 42 against 35 for CDX softwood plywood, so a 7/16 OSB sheet lands near 49 versus about 40.8 for softwood plywood the same size. MDF is heavier still — a 3/4 sheet is about 92 , which catches out anyone used to structural plywood. Three things drive the spread. Species density comes first: Douglas fir outweighs pine, and a hardwood face adds mass over a softwood core. Glue is — panels with more plies per inch carry more adhesive between the layers. Compression is third: OSB and MDF are pressed harder than softwood plywood, packing more wood fiber into the same thickness, which is why both outweigh a softwood sheet at equal dimensions. Choose the grade by its core species, not the face veneer label — many decorative panels hide a light core under a hardwood face.
Nominal label vs. actual thickness, and design weight vs. a real sheet
The number stamped on a panel is nominal, not measured. Under the APA Performance Category system a 3/4 panel is manufactured to about 23/32 (0.71875 ), a 1/2 panel to 15/32 , and so on — each nominal size runs roughly 1/32 under its label. Enter a nominal size and the tool applies that undersize before computing weight, so a 1/2 softwood sheet works out to 43.75 rather than the heavier figure the round label would imply.
That undersize is why this page separates two ideas. The APA value is a design-basis actual thickness — a conservative, standardized dimension — while any single sheet off the rack varies with its exact milling and moisture. Use nominal mode when you only know the label; switch to the measured-inch or millimeter modes when you have calipers or a metric panel.
Metric panels are the clearest case. Baltic birch is sold at a true metric thickness, so an 18 sheet is genuinely 18 — applying the inch nominal undersize would wrongly shave it. Set the thickness mode to actual millimeters, type 18, and a full 2440 x 1220 Baltic birch sheet at 45 comes out to 38.62 (85.15 ); six of them for a cabinet run total 231.74 (about 511 ) before hardware, edging, or finish.
How much does a full stack or subfloor weigh?
Sheet weight only matters once it multiplies. A single 3/4 CDX sheet is about 67.08 ; a full 24-sheet unit — a common delivery bundle — is about 1,610 (730 ), enough to plan a trailer's payload and axle rating around before you add tools. Set the sheet count to your real order and the total scales straight off the one-sheet weight.
For a floor or deck the more useful number is dead load per square foot. A 3/4 CDX panel adds about 2.10 per square foot of surface, so a 12 by 16 room subfloor (192 ) carries roughly 402 of plywood alone (2.10 x 192) — worth knowing before you add joists, underlayment, and finish flooring to a span or payload check.
Sheet weight vs. how much weight plywood can hold
"Plywood weight" pulls two different questions, and this calculator answers only the first: how heavy the sheet itself is, for lifting, stacking, floor dead load, and freight. It does not tell you how much load a panel can carry as a shelf, subfloor, or platform. Load capacity depends on span (the spacing of the supports), the panel's span rating, fastening, and orientation — a 3/4 sheet that weighs 67 might safely carry many hundreds of pounds on 16-inch supports or sag under far less when unsupported. For that question use an APA span-rating table or a structural engineer, not a weight figure.
How this tool computes weight, and when to trust it
The engine treats each panel as a solid rectangular block — volume in cubic feet times a species-level density — with metric outputs as exact SI conversions (pounds x 0.45359237 for kilograms). It surfaces the exact it used for every estimate, applies the APA undersize whenever you enter a nominal size, and assumes stock near 12 equilibrium moisture. Those choices make the figures deliberately conservative planning weights, not certified mill values for a specific run.
Read the result with its limits in mind. It uses species-average densities, not mill- or grade-specific numbers; it excludes resin overlays, factory primers, and laminate faces; and it does not model rain-soaked or high-humidity stock, mixed-species stacks, cutouts or dadoes, or the pallets and strapping in a freight weight. The common input errors are avoidable: entering the nominal label in a measured-thickness field, choosing a grade by its face veneer instead of its core, leaving the sheet count at 1 for a full stack, or mixing feet and inches in one field. Enter the real grade, dimensions, thickness basis, and count and the estimate will track the panel.
Frequently asked questions
How do you calculate the weight of a plywood sheet?
Multiply the sheet's length, width, and actual thickness to get its volume in cubic feet, then multiply that volume by the grade's density in . Keep every dimension in the same unit and use the corrected actual thickness, not the nominal label. For example, a 96 by 48 sheet at a 23/32 actual thickness is 1.917 , and at 35 for CDX that works out to 67.08 .
What does a 4 by 8 sheet of 3/4 plywood weigh?
A 4 by 8 sheet of 3/4 CDX softwood plywood weighs about 67.08 (30.4 ) once the nominal 3/4 label is corrected to a 23/32 actual thickness. Some retail charts quote roughly 60 instead; that lower figure assumes a lighter species mix and drier stock, while this tool uses a conservative 35 planning density. Denser products and hardwood panels weigh more.
How heavy is a 1/2 sheet of plywood?
A 1/2 4 by 8 sheet of softwood plywood weighs 43.75 (19.8 ), using the 15/32 actual thickness behind the 1/2 label. A hardwood-faced panel of the same size weighs about 57.5 . The denser the product, the heavier the finished sheet.
How much does 12mm or 18mm plywood weigh in kilograms?
On a 2440 by 1220 sheet, 12 softwood plywood weighs about 20.0 and 18 Baltic birch about 38.6 . Switch the thickness entry mode to Actual thickness (mm) and type the millimeter value directly, then choose kilogram output — no hand conversion needed. Density drives the result, so OSB and birch run heavier than CDX at the same thickness.
Does OSB weigh more than plywood?
Yes. OSB averages about 42 against 35 for CDX softwood plywood, so a 7/16 OSB sheet weighs about 49 versus roughly 41 for softwood plywood at the same thickness. MDF is heavier still — a 3/4 sheet is about 92 , which is why it surprises people used to structural plywood.
Does this tell me how much weight plywood can hold?
No. This calculator reports the weight of the plywood itself — the dead load you lift, stack, or ship — not its load-bearing or point-load capacity. Span and load ratings depend on support spacing, fastening, span rating, and orientation, so use a span-rating table or a structural engineer for how much a panel can carry.