Free project calculators
How much will your project cost to build?
Free calculators for DIY builders and contractors. Enter your dimensions, get exact material counts with waste allowances — then estimate what it will cost. No sign-up; everything runs in your browser.
Live demo
Try it: slab in seconds
56
80-lb bags
75
60-lb bags
112
40-lb bags
Rounded up. Add ~10% waste for uneven ground — the full calculator handles that.
Open the full calculator →13
Free project calculators
100%
Free — no sign-up
Private
Math runs in your browser
Rounded up
Every material estimate
Free tools
Project calculators
Thirteen calculators covering the materials DIY builders and contractors buy most — concrete, lumber, fencing, paint, and more.
Concrete Bags Calculator
How many bags of concrete do I need? Slab, wall, footing, column & fence-post modes with post displacement.
Open calculatorConcrete Calculator
Cubic yards, ready-mix quantities, and bag equivalents for any pour.
Open calculatorDeck Calculator
Boards, joists, posts, footings, screws & railing from your deck dimensions.
Open calculatorFence Calculator
Posts, pickets, rails, concrete & gates from length, height, and style.
Open calculatorMulch Calculator
Beds, circles & triangles — cubic yards or bags, with depth in inches.
Open calculatorPaint Calculator
Gallons for rooms, walls, and exteriors — doors & windows subtracted, coats compared.
Open calculatorDrywall Calculator
Sheets, screws, joint compound & tape for walls and ceilings.
Open calculatorPaver Calculator
Paver counts, base gravel, bedding sand & polymeric sand for patios and walkways.
Open calculatorSod Calculator
Sod rolls and pallets to cover your lawn area, with waste allowance.
Open calculatorTopsoil Calculator
Cubic yards and bags of topsoil for beds, lawns, and grading.
Open calculatorGravel Calculator
How much gravel do I need — tons and cubic yards for driveways and beds.
Open calculatorSand Calculator
Sand by the ton or cubic yard for bases, bedding, and fill.
Open calculatorTile Calculator
How many tiles do I need — tiles, waste, and boxes for floors.
Open calculatorHow it works
From dimensions to dollars
1
Enter your dimensions
Length, width, thickness — whatever your project needs. No account, no setup, no tracking.
2
Get your materials
Exact counts with waste allowances built in. Every result is rounded up so you don't run short mid-project.
3
Estimate the cost
Plug in your local store prices to see an estimated project cost before you spend a dollar.
Cost-first
Know the price before you buy
Material counts are only half the question. Every HowMuchBuild calculator pairs its quantities with an estimated cost — enter your local store prices and see the project total before you head to checkout. Our cost guides break down typical US price ranges for the most common projects:
Learn
Project guides
Step-by-step walkthroughs and cost breakdowns that pair with the calculators.
Guide
How to Pour a Concrete Slab
Step-by-step DIY guide: planning, forms, base, pour, finish, and cure.
Read guideGuide
How Much Does a Concrete Slab Cost?
Cost ranges for a poured slab — and what drives the price up or down.
Read guideGuide
Concrete Bags vs. Ready-Mix: Which Is Cheaper?
The break-even math between bagged concrete and a ready-mix truck.
Read guideGuide
Fence Planning Guide
Layout, post spacing, and setting posts that stay straight.
Read guideOur promise
Every formula shown. Every result rounded up.
- Formulas and yields published on every page — check our math.
- Results always rounded up — never short mid-project.
- No account, no tracking of your project data.
FAQ
Common questions
Are these calculators really free?
Yes. Every calculator on HowMuchBuild is free to use, with no sign-up, no account, and no usage limits.
Do I need to create an account?
No. There are no accounts on HowMuchBuild. Open a calculator, enter your dimensions, and get your answer.
Is my project data private?
Yes. All calculations run in your browser (client-side). Nothing you type is sent to our servers or tracked.
How accurate are the material estimates?
The formulas use standard construction math and manufacturer-published yields, and every result is rounded up so you don't run short. Treat results as planning estimates — not quotes — and confirm with your supplier for large orders.
Do the calculators estimate project cost?
Yes. Each calculator's results include a cost estimator: enter your local store prices and it totals an estimated project cost. Prices vary by store and region, so every cost figure is labeled an estimate.