Paint Calculator
Calculate how many litres or gallons of paint you need for any room. Accounts for doors, windows, coats and paint coverage rate.
Calculate now20 Free Calculators · Metric & Imperial
Construction Calculators That Work.
Stop guessing materials. Calculate exactly how much concrete, paint, tiles, flooring, bricks and more you need — in seconds, with metric or imperial units.
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Paint & Wall
Paint & Wall Calculators
Calculate exactly how much paint, wallpaper or primer you need for any room or exterior surface.
Wallpaper Calculator
Find out exactly how many rolls of wallpaper you need, including pattern repeat waste. Works with any room shape.
Calculate nowWall Area Calculator
Calculate the total paintable wall area of any room, automatically deducting doors and windows.
Calculate nowFlooring
Flooring Calculators
Calculate tiles, hardwood, laminate or carpet area with waste and overage built in.
Tile Calculator
Calculate how many tiles you need for any floor or wall. Choose tile size, grout width, and waste percentage.
Calculate nowFlooring Calculator
Calculate flooring material for hardwood, laminate, vinyl or engineered wood floors with waste factor included.
Calculate nowCarpet Calculator
Find out how many square metres or yards of carpet you need, including underlay and fitting waste allowance.
Calculate nowAdvertisement
Concrete & Masonry
Concrete & Masonry Calculators
Calculate concrete volume, cement bags, sand, gravel, bricks and mortar for any construction project.
Concrete Calculator
Calculate concrete volume for slabs, footings, columns and walls. Outputs cubic metres, cubic yards and bags needed.
Calculate nowCement Sand Gravel Calculator
Calculate exact proportions of cement, sand and gravel for any concrete mix ratio. Great for DIY mixing.
Calculate nowBrick Calculator
Calculate how many bricks you need for walls, fireplaces or garden beds. Choose brick size and mortar joint width.
Calculate nowMortar Calculator
Calculate how much mortar mix you need for bricklaying or stonework. Outputs bags of premix or component quantities.
Calculate nowRoofing
Roofing Calculators
Calculate roof area, shingles, tiles and other roofing materials needed for any roof shape.
Roof Area Calculator
Calculate the total area of your roof accounting for pitch, slope and overhang. Supports gable, hip and flat roofs.
Calculate nowRoofing Material Calculator
Calculate shingles, tiles, metal sheets or battens needed for your roof with waste and overage included.
Calculate nowWood & Decking
Wood & Decking Calculators
Decking Calculator
Calculate how many deck boards, screws and joists you need for any deck size. Metric and imperial board sizes supported.
Calculate nowLumber Calculator
Calculate board feet or linear metres of lumber for framing, fencing, decking or any timber project.
Calculate nowInsulation
Insulation Calculator
Insulation Calculator
Calculate how many rolls or batts of insulation you need for walls, ceilings and floors. R-value guidance included.
Calculate nowLandscaping
Landscaping Calculators
Calculate soil, mulch, gravel and fill volumes for any garden, yard or landscaping project.
Soil Calculator
Calculate cubic metres or cubic yards of soil, topsoil or fill for garden beds, lawns and excavations.
Calculate nowMulch Calculator
Calculate how many cubic metres, bags or yards of mulch you need for garden beds at any depth.
Calculate nowGravel Calculator
Calculate the volume and weight of gravel needed for driveways, pathways or drainage. Outputs tonnes, m³ or cubic yards.
Calculate nowRenovation Cost
Renovation Cost Estimators
Plan your renovation budget with smart cost estimators for whole-home or room-by-room projects.
Home Renovation Budget Calculator
Estimate your total renovation budget by selecting which areas of your home you're renovating. Includes labour and materials.
Calculate nowRoom Remodel Cost Estimator
Get a detailed cost breakdown for remodelling a single room — kitchen, bathroom, bedroom or living room.
Calculate nowWhy BuildCalc
Built for real projects
We designed every calculator from scratch to give you accurate, real-world results — not guesses.
Metric & Imperial
Toggle between mm, cm, m, inches, feet and yards with a single click. Works for any country.
Instant Results
Real-time calculation as you type. No page reloads, no waiting. Results appear immediately.
Mobile-First
Use on-site from your phone or tablet. Works perfectly on any screen size, even in full sunlight.
Built-in Waste
Every calculator includes a smart waste and overage factor so you never run short on materials.
Visual Results
See your results as visual diagrams — paint cans, tile grids, brick walls and more. Instant understanding.
Copy & Share
Copy results to clipboard, share via link, or print a clean results sheet to take to the hardware store.
No Sign-up
All 20 calculators are completely free forever. No account, no email, no subscription required.
Worldwide Units
Whether you're in Australia, the US, UK or Europe — our calculators support your preferred unit system.
Features
Everything you need to plan your build
Smart Defaults
Every calculator comes pre-loaded with sensible defaults — standard paint coverage rates, typical waste percentages, and common concrete mix ratios. Just change what you need.
Unit Conversion Built-In
Toggle between metric and imperial at any point. All values automatically convert. No manual calculations needed — ever.
Detailed Breakdowns
Get more than just a number. See a full material breakdown — bags, cubic metres, tonnes, litres — so you know exactly what to order.
Error Prevention
Inputs are validated in real-time. If you accidentally enter an impossible value, the calculator flags it immediately before you order the wrong amount.
Copy, Share & Print
Every results screen includes one-click copy, share link, and print-friendly layout. Perfect for sharing with your builder or taking to the hardware store.
Explanations Included
Each calculator includes a how-to guide and FAQ explaining the formulas used. Understand your results, not just the number.