๐๏ธ Construction
Free construction calculators: concrete, square footage, paint, roofing, and more. All in your browser.
Concrete volume, material quantities, paint coverage, roofing areas, cost per square meter โ construction math decides whether a project stays on budget. These calculators turn drawings and room dimensions into material lists and cost estimates.
Results include the assumptions behind each estimate, such as standard mix ratios or typical waste factors. Adjust the inputs to your actual site conditions and the estimates follow โ always leaving a margin for the realities of the build.
Tools cover concrete and aggregates, paint and finishes, roofing and areas, and project-level cost estimation.
Average Calculator
Calculate the average (mean), median, mode, and range of any set of numbers inst
BTU Calculator
Free BTU calculator for sizing air conditioners and heaters. Enter room dimensio
Carpet Calculator
Calculate how much carpet you need for any room. Enter room dimensions to get ex
Concrete Calculator
Estimate concrete volume for slabs, columns, and tubes with our free concrete ca
Gravel Calculator
Calculate how much gravel you need for driveways, pathways, and landscaping. Ent
Mulch Calculator
Calculate how much mulch you need for garden beds and landscaping. Enter bed dim
Paint Calculator
Calculate how much paint you need for any room. Enter wall dimensions, doors, wi
Square Footage Calculator
Calculate square footage, square meters, and more with our free area calculator.
Stair Calculator
Calculate stair dimensions, rise, run, tread depth, and stringer length. Enter t
Tile Calculator
Calculate how many tiles you need for any floor or wall project. Enter room dime
Triangle Calculator
Calculate triangle area, perimeter, angles, and missing sides instantly. Enter a
Frequently asked questions
Are these construction calculators free?
Yes. All tools are free, require no sign-up and run in your browser.
Do the estimates include material waste?
Where relevant, tools apply standard waste factors and state them clearly, so you can adjust for your own site experience.
Can I use the results for ordering materials?
They are solid planning values. For final orders, double-check dimensions on site and confirm coverage figures with your supplier.
Which standards do the concrete tools follow?
Common mix ratios and coverage assumptions used in residential construction, documented on each tool page.
Do they replace a quantity surveyor?
No. For contracts and large builds, professional measurement remains essential โ the tools are for orientation and pre-budgeting.