Drywall Screw and Box Quantity Calculator

Calculate screw and box quantities from sheet count, layers, a user-supplied screws-per-sheet schedule, allowance, and box size.

How to use it

1. Enter sheet count.
2. Enter approved screws per sheet — Enter a quantity derived from the applicable fastening schedule.
3. Enter applied layers.
4. Enter fastener allowance.
5. Enter screws per box.

Formula and calculation order

The calculator multiplies the visible sheet, schedule and layer inputs, then applies allowance. Box rounding is a separate final step.

Only visible inputs participate. There is no hidden manufacturer coverage, fastening schedule, framing spacing, package size or price.

Governing example

The tested governing fixture produces 1408 screws after the required final ceiling. Inputs that must come from product or project documents are intentionally blank in the interface.

Measure first

Measure finished surfaces and openings separately. Keep seams, corners, layers and product quantities in distinct categories so they are not double-counted. Record the source and revision of every schedule, coverage or package value.

Limits

• Screws per sheet is supplied from the applicable assembly, plans or current manufacturer instructions.
• The tool does not choose screw type, length, framing spacing, fastening schedule, layers or rated-assembly details.
• The result is a material-planning quantity, not a rated assembly, structural design, finish guarantee, code decision or supplier quote.

Common mistakes

• Using a generic coverage or fastening rule for a named system.
• Mixing gross and net area.
• Counting openings twice.
• Applying allowance before and after package rounding.
• Assuming a whole-package remainder will be usable.

FAQ

Why are some inputs blank?

A blank input marks a product-, assembly- or project-controlled value that BrowserPowerTools will not invent.

Are package sizes built in?

No. Enter the package or roll size actually available.

Can this verify a rated wall or ceiling?

No. It performs quantity arithmetic only.

Does it upload the job?

No. Inputs remain in the browser.

References

The listed source supports units. Product and assembly values remain user-entered, so no copyrighted schedule or coverage table is bundled.

Engine 1.0.0. Reviewed 2026-08-22.

References and further reading

These sources define or explain the calculation. Source editions and model limits are part of the result—not decorative citations.

1. NIST Guide to the SI, Chapter 8, National Institute of Standards and Technology; accessed 2026-08-22. COMMON-NIST-SI