How much do I need?
Simple calculators that turn your measurements into a shopping list — how many bags, boxes, rolls or gallons to buy. Free, instant, no sign-up.
Concrete & landscaping
Walls & floors
How it works
Measure
Length, width, depth — in feet, inches, meters or centimeters. Fractions like 3 1/2 work too.
See the answer
The amount updates as you type, with a sensible extra for waste already included.
Know what to buy
Bags, boxes, rolls, sheets or gallons — rounded up to what the store actually sells.