Free calculators for the US & UK
Work out materials before you order.
Concrete, paint, flooring, roofing, gravel, and more — quantity plus a planning cost range, with the formula on the same page so you can check it.
No account required. Results update as you type.
Example — concrete slab
10 ft × 10 ft × 4 in
Concrete required
1.23 yd³
Recommended with 10% waste: 1.36 yd³ · estimate, not a quote
Popular calculators
View all →Concrete Calculator
Work out how much ready-mix concrete a slab, footing, or column needs.
CalculatePaintingPaint Calculator
Estimate how much paint a room needs, based on wall area and coats.
CalculateFlooringFlooring Calculator
Work out how many boxes of flooring to buy for a room, with waste included.
CalculateRoofingRoofing Calculator
Estimate roof area, squares, and shingle bundles from a plan footprint and pitch.
CalculateLandscapingMulch Calculator
Find out how many bags or cubic yards of mulch a garden bed needs.
CalculateCost EstimationProject Cost Estimator
Roll materials, labor, delivery, waste, and optional markup into a planning total.
CalculateBrowse by project
A patio usually needs concrete and gravel. A room redo often needs paint and flooring. Pick a bundle and open the tools you need.
Build a patio
Concrete slab or pavers — sub-base, bedding, and top layer quantities.
Build a deck
Decking boards and fence-line planning on a compacted base.
Paint a room
Paint quantity, wallpaper rolls, or a materials-plus-labour cost check.
Install new flooring
Laminate boxes or floor tile counts with waste included.
Refresh a garden bed
Topsoil depth and mulch coverage for beds and borders.
Re-roof the house
Pitch-adjusted area, bundles, and a planning cost roll-up.
Browse by trade
Construction, painting, flooring, roofing, landscaping, and cost — open a category or search from the header.
Construction
Concrete, gravel, sand, brick, and cost tools for slabs, pads, footings, and masonry — with formulas and worked examples on every page.
7 calculatorsLandscaping
Mulch, topsoil, pavers, and yard material volumes from bed area and depth, including bedding sand for patio stacks.
3 calculatorsFlooring
Flooring boxes and floor tile counts with a waste allowance for cuts, doorways, and pattern layouts.
2 calculatorsPainting
Wall paint and wallpaper roll counts from room size, openings, coats, and pattern waste — plus a paint cost band.
3 calculatorsRoofing
Footprint and pitch to approximate roof area, squares, or packs for planning — with waste you can edit.
1 calculatorDeck & Fence
Decking board counts and fence panel, post, and rail planning for straight runs on level ground.
2 calculatorsHome Improvement
Drywall sheet counts, insulation rolls, and room boarding jobs from wall or ceiling area.
2 calculatorsCost Estimation
Materials, labour, markup, and contingency rolled into a planning cost range you can compare to quotes.
1 calculatorThree steps
Pick a calculator
Search “concrete” or “paint”, or open a category.
Enter dimensions
Use feet or metres. Switching units converts what you typed.
Read the estimate
Quantity, optional cost range, and the formula underneath.
What’s on each tool page
The calculator, the formula in plain text, a worked example, and the assumptions behind any cost range. If the number looks odd, you can see why — then change an input or ask a supplier.
How we calculate →- Formula on the page — not only a result.
- Costs shown as ranges — local prices won’t match a national default.
- No account — tools work in the browser.
Guides on materials & budgets
View all guides →How Much Does a Concrete Patio Cost?
A practical breakdown of concrete patio pricing — volume, sub-base, labour, finish, and how to sanity-check a contractor quote.
GuideHow to Budget a Home Improvement Project
Build a renovation budget from materials you can calculate, labour you can quote, and a contingency you refuse to spend on upgrades.
GuideHow Much Paint Do You Need for a Room?
Measure wall area correctly, choose coats and coverage, and convert that into US gallons or UK litres without short-ordering mid-wall.
GuideHow to Estimate Roofing Materials from the Ground
Turn building footprint and pitch into roof squares, bundles, or tile packs — with waste — without pretending the result replaces a roofer’s takeoff.
GuideHow Much Gravel Do You Need for a Driveway?
Convert length, width, and depth into tonnes or cubic yards, plus a practical waste allowance for compaction and uneven ground.
GuideHow Much Mulch Do You Need for Garden Beds?
A clear method for bed area, depth, bags versus bulk delivery, and when to refresh an existing mulch layer.
GuideHow to Estimate Flooring Materials With Waste Allowance
Measure rooms correctly, choose a waste percentage for layout and cuts, and avoid short-ordering plank or tile packs.
GuideHow Much Drywall Do You Need for a Room?
Wall and ceiling sheet counts, standard board sizes, and why openings and waste still matter on a simple rectangle.
Looking for topsoil, wallpaper, ready-mix vs bags, or room measuring? See the full guides list (36 articles) or jump to all calculators.
View all guides →Why these calculators exist
Most material orders go wrong in predictable ways: the wrong slab thickness, a forgotten waste percentage, a lump-sum quote that hides whether gravel base is included, or a bag count that looked fine until the pour started. Project Home Calc puts the quantity, the formula, and a worked example on the same page so you can check the number before you spend money.
Every public tool follows the same pattern — short intro, interactive calculator, plain-language method, formula, example, and FAQ. Guides sit beside the tools when you need the “why” behind patio cost, waste factors, roofing squares, or comparing contractor quotes. Results are planning estimates for US and UK units, not structural designs or local price guarantees.
Start with a calculator, read a guide when two quotes disagree, or see how we calculate for the site-wide assumptions.
Frequently asked questions
Do I need to create an account to use a calculator?
No. Open a tool, enter dimensions, and read the result. Nothing here requires a login.
How accurate are the cost estimates?
They’re planning ranges from typical national prices you can override. Confirm with a local supplier or contractor before you buy — regional pricing moves a lot.
Can I use these tools for both US and UK measurements?
Yes. Each calculator has a unit toggle (feet/inches or metres/centimetres). Switching converts what you already typed; it doesn’t wipe the form. Cost currency follows the unit system.
Is this site free to use?
Yes. Calculators and guides are free. When ads are shown, they are labelled Advertisement and kept away from Calculate controls and results.
Need a quantity?
Start with concrete or paint — most people do — or browse the full list.