Build with confidence.
Start with the numbers.
Simple, well-explained building calculations—whether you are fixing a room, ordering materials, or planning the next project. No account required.
The right tool for the task.
Start with the materials or measurements you already know. Each calculator is labeled with what it can—and cannot—tell you.
Calculators, ready to use.
32 calculators · All are functional basic-quantity or geometry tools. No placeholder links.
Gravel calculator
Estimate gravel volume, mass and order allowance.
Open calculator ↗FlooringTile calculator
Work out tile counts and full-box ordering.
Open calculator ↗ConcreteConcrete slab volume calculator
Calculate a slab’s measured volume and order quantity.
Open calculator ↗MasonryConcrete block calculator
Estimate blocks for a straight wall.
Open calculator ↗RoofingRoof pitch calculator
Convert rise and run into degrees, percentage and X-in-12 pitch.
Open calculator ↗RoofingRoof area calculator
Find sloping roof area from its horizontal footprint.
Open calculator ↗RoofingRoof shingle calculator
Estimate roof covering bundles using editable bundle coverage.
Open calculator ↗TimberBoard foot calculator
Convert lumber dimensions to US board feet.
Open calculator ↗TimberLumber volume calculator
Calculate cut length and solid timber volume.
Open calculator ↗FinishesPaint calculator
Estimate paint from wall area, coats and product coverage.
Open calculator ↗FinishesPrimer calculator
Estimate primer using a product’s published coverage.
Open calculator ↗FinishesDrywall sheet calculator
Estimate board sheets from net area and board size.
Open calculator ↗FlooringFlooring pack calculator
Estimate packs of flooring boards or planks.
Open calculator ↗MasonryBrick calculator
Estimate face bricks from wall coverage and course dimensions.
Open calculator ↗ConcreteRebar weight calculator
Calculate theoretical mass of circular steel reinforcement.
Open calculator ↗ConcreteRebar spacing quantity calculator
Calculate bars to fill a stated clear span at a maximum spacing.
Open calculator ↗ConcreteBeam formwork area calculator
Measure beam soffit and two side faces.
Open calculator ↗ConcreteFooting concrete volume
Calculate concrete for specified pad-footing dimensions.
Open calculator ↗TimberStair rise and run calculator
Explore purely geometric riser and tread measurements.
Open calculator ↗TimberDeck board calculator
Estimate parallel deck boards and total cut length.
Open calculator ↗LandscapingFence post and panel calculator
Estimate posts and bays along one straight fence run.
Open calculator ↗LandscapingPaver calculator
Estimate pavers from paved area and unit dimensions.
Open calculator ↗LandscapingMulch calculator
Calculate mulch volume and bag count.
Open calculator ↗LandscapingTopsoil calculator
Estimate topsoil volume and editable bulk mass.
Open calculator ↗LandscapingSod / turf calculator
Estimate rolls from ground area and roll coverage.
Open calculator ↗SiteworksExcavation volume calculator
Find in-situ and loose excavation volumes.
Open calculator ↗LandscapingDriveway gravel calculator
Calculate driveway gravel with editable compaction allowance.
Open calculator ↗FinishesInsulation volume calculator
Measure insulation area and nominal material volume.
Open calculator ↗RoofingGutter length calculator
Add gutter runs and stock lengths.
Open calculator ↗WaterPool water volume calculator
Calculate simple rectangular pool capacity.
Open calculator ↗GeneralArea calculator
Find area of common construction shapes.
Open calculator ↗GeneralConstruction unit converter
Convert length, area, volume and mass units.
Open calculator ↗A practical tool is useful once. A saved project stays useful.
Clear inputs, useful results
Change measurements, see results immediately, compare metric and imperial, and inspect the method.
Keep your work together
Save calculations on your own device, reopen them later, and export a simple CSV summary.
Know the boundaries
Every tool has visible assumptions. Safety, code compliance and local costs require separate professional or supplier verification.
Measure carefully. Build thoughtfully.
Explore the library or continue a saved project from this browser.