CrewMeasure.com

Sheathing Calculator

Convert an area into sheet counts with editable panel dimensions and waste.

Use the active project roof area or a manual area entry to estimate sheathing purchase counts.

Material List
You'll need 52 sheathing panels for 1,500 sq ft.

Area source

Use the roof calculator's active project area or override it manually.

Area source

Ran the Roof calculator already? Keep Active project selected to reuse that area. Otherwise switch to Manual and type your own square footage.

Chained roof area

Run the roof calculator first to prefill sheathing with the active project roof area.

Panel setup

Set panel size, waste, and what this sheathing is going on.

Context

Only changes the default thickness suggestion and labeling below, not the sheet count.

Sheathing goes over rafters on a roof, or over studs on a wall — pick whichever this is.

Material

Not sure? OSB is the more common, lower-cost choice; plywood is often preferred for roofs in high-moisture areas.

You'll need 52 sheathing panels for 1,500 sq ft.

You'll need

Sheathing estimate

Buy sheets
52 sheets
Base need
46.88 sheets

Actual: 46.875 sheets (rounded to nearest for purchase)

Warnings

  • INFO No roof area is saved in the active project yet, so the manual area is being used.

Detail values

Area used
1,500 sq ft
Sheet area
32 sq ft
Base sheets
46.88

Assumptions

  • Default panel size: 4 ft x 8 ft when unchanged
  • Sheathing spec: 0.4375" OSB for roof sheathing (editable; not a code minimum — verify local requirements)

Included: sheathing panels, waste allowance.

Not included: labor, delivery, permits, disposal of waste material.

Formula details
  • Sheet area: sheetWidth x sheetLength
  • Base sheets: area / sheetArea
  • Purchase sheets: ceil(baseSheets x (1 + wastePercent))

FAQ

Can I change the panel size from 4x8?

Yes. Both sheet width and length are editable so you can match the product you plan to buy.

Does this only work for roofs?

No. It works for any surface area as long as you enter the correct square footage.

Why is the purchase count rounded up?

Sheets are sold whole, so the calculator rounds up after the waste factor is applied.

What do Context and Material change?

Only the default thickness suggestion and the spec shown in the assumptions list — they don't affect the sheet count, which is driven purely by area and sheet size. Set them to document what you actually plan to buy.