Home and DIY calculators
How much to buy and what it costs to run: paint, tile, concrete, timber, and the electricity bill behind everything plugged in.
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- AC BTU calculatorRoom size in, BTU rating out — adjusted for sun, kitchens and extra occupants, then rounded to a size you can actually buy.
- Appliance running costEnter watts, hours per day and your electricity rate to see what any device actually costs to run per day, month and year.
- Concrete calculatorSlab dimensions in, bag count out for 40, 50, 60 or 80 pound bags, plus the ready-mix equivalent in cubic yards.
- Deck board calculatorDeck size in, decking board count out — accounting for the gap between boards, plus joists and screw count.
- EV charging costWork out what a charge costs at home, including the energy lost as heat that never reaches your battery.
- Fence calculatorFence length in, full materials list out: posts, rails, pickets and the concrete to set it all.
- Gravel calculatorWork out gravel by weight, not just volume — because quarries sell by the ton and the conversion depends on the stone.
- Mulch calculatorBed size and depth in, cubic yards and bag count out, plus what bulk delivery would cost at your yard price.
- Paint calculatorWall measurements in, gallons out — with doors and windows subtracted and the second coat counted.
- Stair calculatorTotal height in, riser count and exact riser height out — with the rise-plus-run comfort check that decides whether stairs feel right.
- Tile calculatorRoom size and tile size in, tile count and box count out, with a waste allowance for cuts and breakages.