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Drywall Calculator

Find how many drywall sheets you need for a given wall or ceiling area.

Inputs

Saved Scenarios

— select 2+ to compare

Sheets Needed

25

Spark says

How it's calculated

Formula

Sheets=⌈Total AreaSheet Area⌉Sheets = \lceil \dfrac{Total\ Area}{Sheet\ Area} \rceil
Sheet\ Area
— Area of one drywall sheet

What is the Drywall Calculator?

This calculator divides your total wall/ceiling area by the coverage of one drywall sheet, rounding up since you can't buy a partial sheet.

How to use it

  1. 1 Enter the total area to be covered.
  2. 2 Choose your drywall sheet size.

Worked examples

800 sq ft, 4×8 sheets

25 sheets needed.

Try it

Limitations

  • •Doesn't subtract door/window openings or account for cut waste — many installers add 10-15% extra to this raw figure.

Frequently asked questions

Should I subtract doors and windows from my area?

You can, but most installers skip it and instead add a waste allowance — cut-offs from openings are often reused elsewhere, and the extra margin covers mistakes.