Measure it. Understand it. Buy the right amount.
Ever get to a hardware store and realize you don’t know how many bags, gallons, or boxes you need? These tools are made for that exact moment.
Each calculator gives you an answer first. Underneath, there’s a clear explanation of the math, project-specific things to check before buying, and a short illustrated lesson you can print for several of the tools.
No pretending to know the prices at your local store. Enter the prices you actually find when a cost comparison is useful.
Pick your project
Gravel Calculator
Estimate cubic yards, tons and bag counts from the area and depth. The supplier-density assumption stays visible, with a printable step-by-step lesson.
Concrete Calculator
Find bags, cubic yards, and total dry weight before you buy. Compare bagged and ready-mix costs with your own quotes.
Square Footage Calculator
Add rooms and triangular spaces, subtract uncovered areas, and carry your measurements into another project.
Mulch Calculator
Measure garden beds, estimate bag counts and bulk yards, and see how your own prices compare.
Paint Gallons Calculator
Count walls, doors, windows, coats and extra paint before heading to the store.
Flooring Boxes Calculator
Measure several rooms, add an allowance for cuts, and work out how many complete cartons to purchase.
Square feet, cubic feet and buying units are different.
Once you understand that difference, many home-project calculations become a lot less mysterious. That’s what the printable lessons explain, without turning the job into homework.
Looking for appliances and shopping comparisons? See all Shopping Tools. Want percentages and simpler everyday math? Visit Everyday Calculators.
Some individual guides include clearly disclosed optional affiliate shopping links for relevant supplies. The calculators and lessons are free.