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Construction material planning

Know what to buy before you build.

BuildNumbers is a free estimating workspace for construction and DIY projects. Enter real measurements, calculate material quantities, save the result, combine estimates into one project, and print a shopping-ready report.

Start an estimate See how it works
13 focused calculators2 unit systems1 project workspace0 sign-up required
Example workflow

Patio slab estimate

Ready to order
  1. 01
    Measure20 ft × 12 ft × 4 in
  2. 02
    Calculate3.26 yd³ with 10% allowance
  3. 03
    SaveAdd estimate to “Patio project”
Next stepBuild the material order
Open example

Who uses BuildNumbers?

Built for people who need a material answer they can act on.

Homeowners

Plan a renovation before ordering materials.

DIY builders

Turn site measurements into practical purchase quantities.

Contractors

Create repeatable estimates with visible assumptions.

Estimators

Check quantities, save scenarios, and assemble project reports.

How it works

Measurements in. A usable project plan out.

You do not need to learn thirteen tools. BuildNumbers keeps the same workflow across materials so you always know what to do next.

1

Choose the job

Pick what you are estimating.

Concrete, paint, tile, drywall, brick, gravel, mulch, or a multi-shape concrete project.

2

Enter measurements

See the math and assumptions.

Use metric or imperial inputs. Allowance, coverage, density, openings, and package rounding stay visible.

3

Use the result

Save it to a project.

Combine estimates, review purchase quantities and same-currency costs, then print or save the report as PDF.

Choose your starting point

Start with the job, not a wall of tools.

Browse all 13 calculators
For complex concrete work

Combine multiple concrete shapes into one order.

Slabs, circular pours, footings, columns, walls, and post holes can be measured separately and totaled once before allowance and bag rounding.

Open Multi-Shape Concrete Project
Quick estimate

I need one material quantity.

Choose a focused calculator for concrete, paint, tile, drywall, brick, gravel, or mulch.

Find a calculator Whole project

I already have estimates to combine.

Group saved estimates into a project with shopping quantities, cost roll-ups, and a printable report.

Open Project Mode

More than calculators

Your estimates can become one project record.

Save results locally in your browser, group different materials under one project, review purchase quantities and same-label costs, then print the project or save it as PDF.

  • No account required
  • Saved locally in the current browser
  • Structured shopping quantities
  • Printable project summary
Open Project Mode
PROJECTBackyard renovation
3 estimates
Patio concrete3.26 yd³
Garden mulch4.1 yd³
Fence post concrete18 bags
Project recordReady to print

Why trust the result?

The calculation is part of the product, not a black box.

BuildNumbers keeps formulas, units, assumptions, and engine versions visible so an estimate can be checked before money is spent.

Read the methodology
01Formula and unit references
02Metric and imperial inputs
03Explicit allowances and product assumptions
04Versioned calculation engines with regression tests

Ready when the measurements are

Find the calculator that matches your job.

Search and filter the complete calculator library, then move the result into Project Mode when you are ready.

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