Construction

About Our Construction Calculators

Our construction calculators turn tape-measure numbers into a shopping list. Whether you are a homeowner planning a patio, a DIYer repainting three bedrooms or a contractor double-checking a quote, they answer the question that comes before every job: how much material do I actually need? Order too little and you face a second trip; order too much and money sits in the garage as leftovers. Each tool turns your dimensions into a quantity you can take straight to the supplier.

Most popular tools

• Concrete / Cement Calculator — Works out the volume of a slab, footing or post hole and how much mix it takes.
• Paint Quantity Calculator — Tells you how much paint covers your walls once doors and windows are taken out.
• Tile Quantity Calculator — Counts the tiles and boxes needed for a floor or wall, allowing for cuts.
• Brick Quantity Calculator — Estimates the bricks needed for a wall of a given length and height.
• Roofing Cost Calculator — Gives a ballpark price for a new roof based on its size and material.
• Laminate Flooring Calculator — Converts room size into packs of laminate, with spare boards for waste.
• Gravel Calculator — Finds the tonnage or volume of gravel for a driveway, path or sub-base at your chosen depth.

How to choose the right calculator

• Foundations and hardscaping: the Concrete / Cement, Gravel and Brick Quantity calculators cover slabs, bases and masonry walls.
• Roofs and boundaries: start with the Roof Area Calculator to get the true sloped area, then use that figure in the Roofing Cost Calculator. The Fence Calculator handles posts and panels.
• Interior finishes: the Paint, Wallpaper, Tile and Laminate Flooring calculators work room by room.

Quick answers

How much extra material should I order? Around 10% extra is the usual allowance for tile, laminate and brick, rising to roughly 15% for diagonal tile layouts or rooms with lots of corners. Add that margin unless the tool has already included it.

Why measure the roof separately from the floor plan? A pitched roof is larger than the footprint it covers, so using floor area alone under-orders shingles and underlayment.

Should I buy all the paint or tile at once? Yes, where you can. Separate production batches can differ slightly in shade, so buying the full calculated quantity up front avoids visible patches.

Every one of these construction calculators is free, runs in your browser and needs no sign-up. Treat the results as planning estimates, and check structural work against local building codes or with a qualified builder.