Practical calculators for real tasks

Reviewed calculators for home, repairs, materials, and measurements, with explained formulas and localized units.

Start with calculators built for real paint, flooring, garden, and material estimates.

Available calculators

Calculate percent of a number, percent change, discounts, increases, and part-of-total percentages.

Estimate paintable area, paint volume, and cans with US customary or metric units.

Calculate tile area, waste, pieces, boxes, and spare material with US customary or metric units.

Estimate mulch, soil, compost, or landscape rock by bags and bulk volume with US customary or metric units.

Estimate gravel, crushed stone, or landscape rock by volume, weight, bags, and bulk order size.

Estimate concrete volume, bags, and ready-mix order size for slabs, footings, post holes, and known volumes.

Estimate mixed epoxy, resin and hardener parts, kits to buy, and layer batches for molds, coatings, and pours.

Estimate filament, electricity, machine time, labor, failed-print allowance, and a suggested price for FDM prints.