Home, Garden & DIY
Home, garden and DIY calculators: paint, tiles, flooring, concrete and insulation quantities, heating and energy use, soil and garden planning. Enter your room or plot sizes to estimate materials before you buy, and allow a margin for waste.
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- Staircase Calculator Number of risers and treads for a total rise, plus the stringer length for your tread depth.
- Concrete Calculator Calculate the concrete volume for a slab from its length, width and depth, with the number of 40 kg bags.
- Paint Calculator Work out how many liters of paint and how many cans you need from the wall area, number of coats and coverage per liter.
- Asphalt Calculator Asphalt tonnage for a rectangular area at a compacted thickness and mix density.
- Gravel Calculator Calculate the volume and weight of gravel or aggregate for an area from length, width and depth.
- Brick Calculator Calculate how many bricks a wall needs (10% waste).
- Container Soil Volume Calculator Calculates the volume of potting soil needed to fill round pots or rectangular planters, in liters and cubic feet.
- Roof Pitch Calculator Calculate roof pitch angle, ratio and rafter length multiplier.
- Electricity Cost Calculator Calculate the daily, monthly, and yearly cost of running any electrical device.
- Board Feet Calculator Calculate the board feet of lumber from dimensions and quantity.
- Roofing Squares Calculator Calculate roofing squares and shingle bundles needed.
- Pool Volume Calculator Calculate the volume of a swimming pool in m³, litres and gallons.
- Decking Calculator Calculate decking boards and linear meters for an area.
- Plant Spacing Calculator Calculate how many plants fit a bed at a spacing.
- Sod Calculator Calculate sod/turf area and rolls needed.
- Excavation Calculator Calculate excavation volume with swell factor.
- Grass Seed Calculator Calculate how much grass seed an area needs.
- AC BTU Calculator Estimate the air-conditioner cooling capacity (BTU) needed for a room.
- Tile Calculator Work out how many tiles and boxes you need from the area, tile size and waste allowance.
- Concrete Bags Calculator Calculate how many concrete bags a volume needs.
- Insulation R-Value Calculator Calculate insulation R-value from thickness and material.
- Plant & Seed Spacing Calculator Calculate how many plants or seeds fit in a garden bed based on its size and the spacing between plants.
- Drywall Calculator Calculate how many drywall sheets you need for a wall area.
- Mulch Calculator Mulch volume for a rectangular bed and how many bags you need at your bag size.
- Topsoil Calculator Calculate the volume of topsoil for a bed from length, width and depth, in m³, litres and 25 L bags.
- R-Value Calculator Calculate the thermal R-value and U-value of an insulation layer from its thickness and conductivity.
- Rainwater Harvesting Yield Calculator Estimate how many litres of rainwater you can collect from your roof each year.
- Dilution Ratio Calculator Split a total volume into concentrate and water for a given dilution ratio (1:N).
- Deck Board Calculator Calculate how many deck boards you need from the deck dimensions and board size, with a waste allowance.
- Mortar Calculator Calculate mortar bags needed for a brick count.
- Tank Volume Calculator Calculate the total capacity of a horizontal or vertical cylindrical tank from its diameter and length. Get the result in liters, cubic meters, and US gallons.
- Water Hardness Converter Convert water hardness between ppm (mg/L CaCO₃), grains per gallon, German degrees and mmol/L.
- Carpet Cost Calculator Calculate the area and cost of carpeting a room.
- Lawn Mowing Time Calculator Estimates mowing time from lawn area, mower cutting width and your walking speed, including an overlap/turning allowance.
- Wall Stud Count Calculator Estimate the number of studs and plate material for a framed wall at a given on-center spacing.
- Deck Screw Calculator Estimates the total deck screws and number of boxes required from deck area, board width, joist spacing and screws per joist crossing.
- Fence Calculator Calculate how many fence posts and sections you need.
- Gutter Downspout Calculator Estimate peak roof runoff and how many downspouts you need from roof area and rainfall intensity.
- Garden Watering Calculator Estimates the water volume needed to give a garden bed a target depth of watering, based on its area and the inch-per-week guideline.
- Hedge Plant Calculator Calculate how many plants you need for a single-row hedge from the hedge length and spacing between plants. Plan your planting and budget before you buy.
- Tile Grout Calculator Estimates grout quantity from tile size, joint width, joint depth and total area, using the standard grout coverage formula.
- Lumber Cost Calculator Calculates total board feet for a quantity of boards and multiplies by a price per board foot to estimate lumber cost.
- Compost Ratio Calculator Split a compost bin volume into browns (carbon) and greens (nitrogen) by a target ratio.
- Post Hole Concrete Calculator Estimates the concrete volume and number of bags required to fill post holes around a buried post. Great for fences, decks, mailboxes, and signs.
- PPM to Ratio Calculator Convert a concentration in parts per million (ppm) to percent, a 1:N ratio and mg/L.
- Firewood Cord Calculator Calculate firewood stack volume in cords.
- TV Mount Height Calculator Calculate the perfect height to mount your TV on the wall based on screen size and your seated eye level.
- Baseboard Trim Calculator Calculate the baseboard (skirting) length and pieces for a room, minus door openings, plus waste.
- Paver Patio Calculator Calculates how many pavers you need for a patio or path from the area and single-paver size, including a waste allowance.
- Gate Brace Calculator Calculate the diagonal brace length for a rectangular gate frame using the Pythagorean theorem on its width and height.
- Squash Hill Spacing Calculator Works out how many squash hills fit in a garden row and the total number of seeds to plant.
- Standby Power Cost Calculator Calculate the annual cost of a standby (phantom) load — devices drawing power while off or idle — from the standby wattage and your electricity rate. See the yearly cost and energy.
- Water Heater Size Calculator Estimates the storage water heater tank size in gallons needed for your household's peak-hour hot-water demand.
- Baseboard Heater Sizing Calculator Estimates the electric baseboard heater wattage, linear length, and BTU output needed to heat a room of a given area.
- Furnace BTU Sizing Calculator Estimate the furnace heating capacity in BTU/h your home needs from its square footage and climate zone, using standard BTU-per-square-foot factors. Avoid over- or under-sizing your heating system.
- Wallpaper Calculator How many rolls of wallpaper you need for a wall, with a 10 cm trim allowance per strip.
- Crown Molding Calculator Calculate the crown molding length and number of pieces needed for a room, including waste.
- Deck Footing Calculator Calculates how many footings a deck needs and the concrete volume and bag count for the cylindrical piers.
- Dryer Energy Cost Calculator Calculate the energy cost of running a clothes dryer per load from its power, the hours per load and your electricity rate. See the cost and energy per load.
- Energy Cost Per Unit Calculator Calculates the electricity cost embedded in each unit a machine produces, based on its power draw and rate.