How to use this tool
- Enter the quantity needed and a justified waste allowance.
- Enter coverage or units per package, price per package and delivery.
- Review rounded-up packages, purchased quantity and total cost.
A worked example
For 450 square feet, 10% waste means 495 square feet. At 20 square feet per box, buy 25 boxes. At $40 per box plus $60 delivery, cost is $1,060.
What the result includes
Check manufacturer coverage, site measurements and suitability. This does not determine structural specifications or material safety. Sales tax and unentered fees are excluded.
Common questions
Can I use gallons instead of square feet?
Yes, if both the required quantity and package size use gallons. For paint coverage, you can instead enter wall area and the manufacturer’s coverage per can, accounting for coats.
Why round packages up?
Partial packages may not be sold. The calculator rounds required quantity to whole packages so the budget includes what you must purchase.
Prepared by the Tech Turtle team. Formulas and assumptions are explained above so you can check the result against your own job records.
