Free Home & Construction Calculators 2026

4 free tools · Last updated March 2026

Estimate paint, flooring, concrete, and room dimensions — all free, all instant. Perfect for DIY projects and professional estimates.

Calculate how many gallons of paint you need for any room or surface area.

Estimate flooring material needed for hardwood, tile, laminate, or carpet.

Calculate concrete volume in cubic yards or meters for slabs, footings, and columns.

Calculate the area of any room shape — rectangular, L-shaped, or custom.