Home & construction tools

Home and construction calculators

Estimate materials, room dimensions, energy costs, heating, cooling and household projects.

20 focused tools

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Paint Calculator

Estimate how many litres of paint you need from wall dimensions, openings, coverage per litre, coats and waste allowance.

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Wallpaper Calculator

Calculate wallpaper using room perimeter, wall height, roll width, roll length, pattern repeat, and waste allowance, then review the result and supporting breakdown.

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Flooring Calculator

Calculate flooring using room length, room width, pack coverage, waste allowance, and price per pack, then review the result and supporting breakdown.

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Tile Calculator

Calculate tiles using surface area, tile width, tile height, tiles per box, and waste allowance, then review the result and supporting breakdown.

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Concrete Calculator

Calculate concrete using length, width, depth, waste allowance, and bag yield, then review the result and supporting breakdown.

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Gravel Calculator

Calculate volume required using length, width, depth, bulk density, and bag size, with a supporting breakdown of the entered values.

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Soil and Mulch Calculator

Calculate volume required using length, width, depth, bulk density, and bag size, with a supporting breakdown of the entered values.

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Decking Calculator

Calculate decking using deck length, deck width, board width, gap between boards, board length, and waste allowance, then review the result and supporting breakdown.

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Fence Material Calculator

Calculate fence materials using fence length, panel width, post spacing, and rails per section, then review the result and supporting breakdown.

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Roof Pitch and Material Calculator

Calculate roof area using building length, building width, rise, run, waste allowance, and coverage per bundle, then review the result and supporting breakdown.

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Staircase Calculator

Calculate staircase using total rise, target riser height, and available horizontal run, then review the result and supporting breakdown.

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Room Area and Volume Calculator

Calculate room size using length, width, and height, then review the result and supporting breakdown.

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Moving Box Estimator

Estimate how many moving boxes you may need from the number of bedrooms, residents and amount of belongings.

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Electricity Cost Calculator

Calculate electricity cost using power, hours used per day, days used, electricity price, and currency, then review the result and supporting breakdown.

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Appliance Running Cost Calculator

Calculate electricity cost using power, hours used per day, days used, electricity price, and currency, then review the result and supporting breakdown.

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Air Conditioner BTU Calculator

Estimate ac capacity using room length, room width, ceiling height, people normally present, and sun exposure, then review the result and supporting breakdown.

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Radiator Size Calculator

Estimate radiator output using room length, room width, room height, insulation, and external walls, then review the result and supporting breakdown.

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Solar Panel Estimate Calculator

Estimate solar system using annual electricity use, peak sun hours per day, panel power, system efficiency, and usable roof area, then review the result and supporting breakdown.

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Battery and UPS Runtime Calculator

Estimate runtime using battery voltage, battery capacity, load power, usable capacity, and inverter efficiency, then review the result and supporting breakdown.

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Pool and Water Tank Volume Calculator

Calculate rectangular or round pool and water tank volume in cubic metres and litres from dimensions and average depth.

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What this category covers

Home and construction calculators estimate quantities for materials and room projects. They help create an initial order figure from dimensions, coverage and waste assumptions.

Recommended starting tools

Paint Calculator — Estimate how many litres of paint you need from wall dimensions, openings, coverage per litre, coats and waste allowance.
Flooring Calculator — Calculate flooring using room length, room width, pack coverage, waste allowance, and price per pack, then review the result and supporting breakdown.
Tile Calculator — Calculate tiles using surface area, tile width, tile height, tiles per box, and waste allowance, then review the result and supporting breakdown.

How to choose

Measure in consistent units, split irregular spaces into simple areas and include an appropriate waste allowance based on the material and layout.

Frequently asked questions

Do estimates include waste?

Only when the tool includes a waste input or states an allowance.

Should I buy exactly the calculated quantity?

Check pack sizes, pattern matching, cuts and supplier guidance before ordering.