Home Improvement Calculators
Estimate materials and cost for home projects — concrete, flooring, roofing, and more.
Number of Calculators: 38
What to Know
This is the site's largest project-planning category — everything from a single Concrete pour to a full Deck, Fence, or Roofing job. Most calculators here follow the same shape: enter your project's dimensions, get back not just a raw material quantity but a waste-adjusted order amount, an estimated cost range, and links to the calculators (like Gravel or Rebar) a real project usually needs alongside it.
Electrical and HVAC sizing (Wire Gauge, Generator Sizing, BTU, Heat Pump Sizing, Ductwork Size) sit in their own smaller cluster for anyone planning a system upgrade rather than a surface finish. Material costs and coverage rates vary a lot by region and supplier, so every estimate here is a planning starting point — always double-check current local pricing before ordering.
- ConcreteCalculate how much concrete you need for a slab, patio, walkway, or round post/deck footing — in cubic yards or bags — plus weight and project guidance.
- Concrete StepsCalculate how much concrete you need to pour a set of solid outdoor steps, from the number of steps, riser height, tread depth, and step width.
- Foundation ConcreteCalculate how much concrete you need for a continuous strip/perimeter footing around a building, plus an optional stem wall — in cubic yards or bags.
- RebarCalculate how much rebar you need for a concrete slab or footing — bar count in each direction, total linear footage, standard bars to buy, and wire ties needed.
- DeckingCalculate how many deck boards you need from your deck size, board dimensions, gap spacing, and a waste allowance -- plus an optional joist count estimate.
- PaverCalculate how many pavers you need for a patio, walkway, or driveway, plus the sand bedding layer beneath them.
- Retaining WallCalculate how many wall blocks you need for a retaining wall, plus the gravel backfill volume behind it.
- SidingCalculate how many squares and boxes of siding you need for a house, based on wall perimeter and height.
- Window Replacement CostEstimate the total cost of a whole-house window replacement project from the number of windows, material cost, labor cost, and an optional removal and disposal fee.
- Heat Pump SizingEstimate the heat pump capacity (in tons) your whole home needs, based on square footage, climate, and insulation.
- PaintCalculate how much paint you need for a room based on its dimensions, doors, windows, and number of coats.
- FlooringCalculate how much flooring material to order for a room, including a waste margin and estimated cost.
- CarpetCalculate how much carpet to order for a room in square yards, including roll-width seam waste, padding/underlay, and estimated cost.
- MulchCalculate how much mulch you need for a garden bed in cubic yards and standard bags, from its length, width, and depth.
- Sod / Grass SeedCalculate how many sod pallets or how many pounds of grass seed you need to cover your lawn's area.
- RoofingCalculate how many roofing squares and bundles of shingles you need, accounting for your roof's pitch.
- Roof PitchFind your roof's pitch as an X-in-12 ratio, an angle in degrees, and a slope percentage, from a measured rise and run or a directly-measured angle.
- Gutter Size & LengthFind the gutter length to order, a recommended gutter size (5 in or 6 in), and how many downspouts you need, from your eave length and roof area.
- StairsWork out the number of steps, riser height, tread depth, and stringer length for a staircase.
- GravelCalculate how much gravel you need for a path, driveway, or garden bed, in cubic yards and tons.
- TopsoilCalculate how much topsoil you need for a garden bed or lawn, in cubic yards and an estimated weight.
- TileCalculate how many tiles you need for a floor, including grout spacing and a waste allowance.
- BTU / Air Conditioner SizingCalculate the BTU rating you need for a room based on its size, ceiling height, occupants, and sun exposure.
- Ductwork SizeFind the round duct size needed to carry a given airflow at or below a target duct velocity.
- Heat LossEstimate how much heat a wall, window, or roof surface loses per hour, given its area, R-value, and the indoor/outdoor temperature difference.
- HVAC Operating CostEstimate the electricity cost of running an air conditioner or heat pump, from its BTU output, SEER rating, and usage.
- Tile GroutEstimate how much grout (by weight) you need for a tiling job, based on tile size, joint width and depth, and the area being tiled.
- FencingCalculate how many fence posts, rail sections, and rails you need for a straight fence run.
- Fence Material CostEstimate the total cost of a fencing project from its length, a per-foot materials cost, and optional labor and gate costs.
- DrywallFind out how many drywall sheets you need for a room, based on its dimensions and your chosen sheet size.
- Drywall Joint CompoundEstimate how much pre-mixed joint compound and joint tape you need to finish drywall seams, from your total drywall area and number of coats.
- WallpaperCalculate how many rolls of wallpaper you need for a room, accounting for doors, windows, and a pattern repeat.
- Baseboard / TrimFind how much baseboard or trim to order for a room, accounting for doorways and a waste margin, plus how many boards to buy.
- Firewood (Cord of Wood)Find how many cords of firewood a stacked woodpile holds, and its estimated cost.
- Wire Gauge / AmpacityFind the minimum recommended AWG wire gauge for a given circuit amperage.
- Generator SizingEstimate the minimum generator size you need to run your appliances during an outage.
- Swimming Pool Volume & Chemical DosingCalculate your pool's volume in gallons from its shape and dimensions, then work out how much liquid chlorine to add to reach a target Free Chlorine reading.
- Insulation R-ValueFind the recommended insulation R-value for your DOE climate zone and building component, and the thickness needed for your chosen material.