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About ProjectLab

ProjectLab provides simple, free calculators to help people plan everyday DIY projects. Our goal is to make it easier to estimate materials before shopping, compare quantities, and reduce guesswork.

What you can calculate

• Paint for rectangular room walls, accounting for openings and coats.
• Flooring area, cutting allowance and boxes.
• Mulch volume for rectangular garden beds.
• Concrete volume and approximate ready-mix bag counts for a rectangular slab.

How to use the estimates

Our calculators provide planning estimates based on the measurements and assumptions you enter. Actual material requirements depend on product coverage, waste, site conditions and installation methods. Always check manufacturer instructions and consult a qualified professional for structural or safety-critical work.

Questions or feedback?

Found an issue or have an idea for another tool? Visit our contact page.