OSB weight calculator
A full 4x8 sheet of 3/4" osb weighs about 80 lb. Change the dimensions below for your own pieces.
- Density
- 40 lb/ft³
- 3/4" 4x8 sheet
- 80 lb
- 1/2" 4x8 sheet
- 53 lb
= 0.75"
2 × OSB
160lb
Each piece
80.0 lb
In kilograms
73 kg
Per sq ft of face
2.5 lb
OSB at 40.0 lb/ft³ as supplied. Each piece is 96" × 48" × 3/4", so 2.00 ft³ of material.
Before you pick it up
Two people per piece. 80 lb each. Awkward as well as heavy: a wide panel has no good handhold, so it is heavier to carry than the number suggests.
The whole load. All 160 lb of it. Worth checking against what the car is rated to carry before you drive to the yard, and worth knowing before a freight quote.
Before you drill. The shelf itself is 80 lb before anything goes on it. Size the hardware for the shelf plus its load, fix into framing rather than drywall anchors wherever the two disagree, and remember that a floating shelf loads its bracket as a lever — the further out the weight sits, the harder it pulls at the wall.
OSB
Structural sheathing, strands and resin. Heavy for what it does and it drinks water at the edges, but it is cheap and it is what most of the walls around you are made of.
OSB questions
- How much does osb weigh?
- About 40 lb per cubic foot as supplied. That makes a full 4x8 sheet roughly 80 lb at 3/4", 53 lb at 1/2" and 27 lb at 1/4". Panel densities are nominal and vary a few pounds between mills.
- What should I know about working osb?
- Structural sheathing, strands and resin. Heavy for what it does and it drinks water at the edges, but it is cheap and it is what most of the walls around you are made of.
- How much weight can a floating shelf hold?
- That depends entirely on the bracket and what it is fixed into, not on the shelf. What this calculator tells you is the part people forget: what the shelf weighs before anything goes on it. A 48" × 10" × 2" solid oak shelf is around 23 lb empty. Size the hardware for the shelf plus its load, fix into framing rather than drywall anchors, and remember that a floating shelf loads its bracket as a lever — weight at the front edge pulls far harder than weight at the wall.
- What's the difference between board feet and weight?
- Board feet measure volume and are what you are charged for; weight is what you have to carry and ship. They are related by the density of the species, which varies by more than two to one across common woods — a board foot of white pine is about 2 lb and a board foot of hickory is about 4. Two orders of identical board footage can differ by a hundred pounds.
- How do I estimate freight for furniture?
- Start with the weight of the wood, then add the joinery hardware, the finish, and the crate — a plywood crate with bracing often adds 30% to 50% to the shipping weight of a table. Freight is usually billed on the greater of actual weight and dimensional weight, so a large light piece can be charged as though it were much heavier. Get the number here, then ask the carrier what they will actually bill.