10 free tools
Home and DIY calculators
Running out of paint halfway through a wall, or returning six unopened boxes of flooring, is what happens when material math gets done on the back of a receipt. These calculators turn room and yard measurements into shopping quantities: gallons of paint, square feet of flooring and tile, bags or cubic yards of concrete, mulch and topsoil, and total square footage for oddly shaped spaces.
All home & diy tools
BTU Calculator
BTU calculator: size a room air conditioner with the ENERGY STAR chart and its sun, occupancy, and kitchen adjustments, plus heater size in BTU and watts.
Concrete Calculator
Concrete calculator for slabs, footings, columns, and steps. Get cubic yards, 80 lb and 60 lb bag counts with waste, and whether to order ready-mix.
Electricity Cost Calculator
Electricity cost calculator: watts × hours × your rate for any appliance. Presets for heaters, ACs, fridges, and EVs; see daily, monthly, and yearly cost.
Flooring Calculator
Flooring calculator for LVP, laminate, hardwood, and carpet. Get boxes or square yards to buy with waste by layout, plus underlayment, trim, and cost.
Gravel Calculator
Gravel calculator: enter area and depth to get cubic yards and tons for crushed stone, pea gravel, road base, or sand, with compaction and truckloads.
Mulch Calculator
Mulch calculator: add your beds and tree rings, pick a depth, and get cubic yards and 2 cu ft bags to buy, plus whether bags or bulk delivery is cheaper.
Paint Calculator
Paint calculator: enter room size, doors, windows, and coats to get gallons and quarts to buy, plus ceiling paint and primer. Adjusts for textured walls.
Roofing Calculator
Roofing calculator: enter house size, overhang, and pitch to get roof area, squares, and shingle bundles, plus underlayment, ridge cap, and drip edge.
Square Footage Calculator
Square footage calculator for rectangles, L-shaped rooms, circles, and triangles. Add multiple areas, get sq ft, sq yd, and m², and estimate the cost.
Tile Calculator
Tile calculator: enter the area, tile size, grout joint, and layout to get tiles and boxes to buy with waste included, plus thinset and grout on the list.
About these tools
Each tool shows the coverage figure it assumes, so you can match it to the label on the product you actually buy. A gallon of interior paint covers roughly 350 to 400 square feet per coat, and most walls need two. An 80-pound bag of concrete makes about 0.6 cubic feet, so a 10 by 10 foot slab poured 4 inches thick needs around 56 bags. Add 10 percent for waste on straight flooring layouts and closer to 15 percent for diagonal or herringbone patterns.
Everything is calculated in your browser, and nothing is uploaded. Measure twice, keep every field in the same unit, and round up to whole boxes or bags. Returning one sealed box is cheaper than a second trip mid-project, and a spare box from the same dye lot makes future repairs match.