Free · No signup · Metric
Calculate Your Next Home Project
Free, simple calculators to help you work out how much paint, concrete, flooring, mulch and more you need for your next project.
Popular calculators
The six calculators Australians reach for most, from repainting a bedroom to ordering gravel by the tonne.
Paint Calculator
Work out how many litres of paint you need for your room.
Open calculatorTile Calculator
How many tiles you need, including a waste allowance.
Open calculatorConcrete Calculator
Cubic metres of concrete for slabs, paths and footings.
Open calculatorMulch Calculator
Cubic metres of mulch for garden beds of any size.
Open calculatorFlooring Calculator
Square metres of timber, laminate or vinyl flooring.
Open calculatorGravel Calculator
Volume and weight of gravel, pebbles or crushed rock.
Open calculatorBrowse by project
Every calculator lives in one of five categories, so you can jump straight to the type of work you're planning.
Painting
Calculate paint, wall area and wallpaper requirements.
View categoryFlooring & Tiles
Calculate tiles, flooring and carpet requirements.
View categoryGarden & Landscaping
Calculate mulch, soil, gravel and landscaping materials.
View categoryBuilding & Renovation
Calculate concrete, decking, fencing and building materials.
View categoryGeneral Calculators
Useful area, volume and measurement calculators.
View categoryHow it works
Enter your measurements
Type in your room, area or bed dimensions — metres or centimetres, whatever your tape measure says.
Get your calculation
Instant results in plain language, with the supporting numbers shown so you can check them.
Plan your project
Take the numbers to the supplier, price the materials, and get the job done with confidence.
Why use ProjectCalc?
Free to use
Every calculator is free, with no signup, no paywall and no limits on how many times you use them.
Australian metric
Metres, square metres, cubic metres and litres as standard — with centimetres and millimetres where they're useful.
Simple calculations
Clear inputs, honest assumptions and results rounded sensibly. No confusing extras you don't need.
Mobile friendly
Designed for the hardware store aisle and the garden bed — big inputs, instant answers, no pinching and zooming.
No signup required
Get your answer in seconds. An optional free account only exists if you want to save projects.
Real home projects
Built around the jobs people actually do: painting bedrooms, tiling bathrooms, mulching gardens, pouring slabs.
Can't find the calculator you need?
Tell us what calculator we should build next. Every request is read, and popular ones get built.
Ready to start planning?
Pick a calculator, enter your measurements, and get a number you can take to the supplier.
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