Calculators
Home & Construction
Materials, areas, volumes and garden planning. · 34 tools
Estimate materials before you buy: how many tiles, liters of paint or bags of concrete a job needs, with realistic waste allowances. The construction tools work in metric and imperial units, and garden tools cover plant spacing, soil, grass seed and mulch.
Aquarium Volume CalculatorFree aquarium volume calculator: enter your tank dimensions in inches or cm and get US galBoard Foot CalculatorFree board foot calculator: enter thickness, width, length and quantity for each board to get board feet per…BTU CalculatorFree BTU calculator: enter room size, ceiling height, sun exposure, occupants and insulation to find the…Concrete Calculator — Bags NeededCalculate how much concrete or ready-mix bags you need for a pour.Cubic Yard CalculatorFree cubic yard calculator: enter length, width and depth to get cubic yards, cubic feet, Deck Screw CalculatorCalculate the number of deck or floor screws from area and screw density.Decking CalculatorCalculate the running metres and number of decking boards from deck size, board width a…Drywall CalculatorCalculate how many drywall sheets you need from wall or ceiling area.Electricity Bill CalculatorFree electricity bill calculator: add your appliances with watts and hours of use, enter your rate per kWh…Epoxy Resin CalculatorEpoxy resin calculator: get exact resin and hardener amounts in ounces and ml for table toFence CalculatorCalculate the number of fence posts and panels from fence length and post spacing.Flooring CalculatorCalculate the number of parquet or laminate packs from room area and waste allowance.Garden Soil CalculatorCalculate how much garden soil you need (m³ and 40 L bags) from bed area and layer depth.Generator Wattage CalculatorFree generator sizing calculator: tick the appliances you want to run — fridge, sump pump, furnace, AC, well…Grass Seed CalculatorCalculate how much grass seed you need from the area to be sown and the seeding rate.Gravel CalculatorCalculate the volume (m³) and weight (tonnes) of gravel or crushed stone from area dime…Grout CalculatorCalculate the amount of tile grout (kg) needed from tile size, joint width and area.Heating Power CalculatorEstimate a room's heating power need (kW) from volume and insulation level.Insulation CalculatorCalculate how many insulation packages you need from wall or ceiling area.Mulch CalculatorFree mulch calculator: enter your bed size and depth in inches to see cubic yards, 2 and 3Paint CalculatorCalculate how much paint you need and the total cost.Paver CalculatorFree paver calculator: enter your patio or walkway size and paver dimensions to get the number of pavers…Plant Spacing CalculatorFree plant spacing calculator: enter bed size and spacing to see how many plants fit in a Pool Volume CalculatorFree pool volume calculator: find how many gallons (and liters) your rectangular, round, oval, kidney or…Price Per Square Foot CalculatorFree price per square foot calculator: divide a home price, rent or material cost by the area to get $/sq…Roof Area CalculatorCalculate the roof surface area of a gable roof from base dimensions and pitch.Roof Pitch CalculatorCalculate roof pitch in degrees and percent from rise and horizontal run.Skirting Board CalculatorCalculate skirting board running metres and pieces from room perimeter and door widths.Square Footage CalculatorFree square footage calculator: add rooms and shapes (rectangle, circle, triangle) with feStair CalculatorCalculate stair rise and run from floor height and number of steps.Tile Calculator — Tiles NeededCalculate how many tiles you need for a floor or wall.Topsoil CalculatorFree topsoil calculator: enter the area and depth to find how many cubic yards of topsoil you need, how many…Ventilation CalculatorCalculate a room's ventilation need (m³/h and L/s) from volume and air change rate.Wallpaper Calculator — Rolls NeededCalculate how many wallpaper rolls you need for a room.
How to choose
- Measure twice
- Enter the finished dimensions; the calculators add waste (typically 5–10 %) so you are not short at the end of the job.