Concrete & Masonry Calculators

Estimate concrete, block, brick, mortar, pavers and rebar with calculators that show the formula, assumptions and listed sources. Free, no sign-up, and built to be checked.

Concrete pours

Volume in cubic yards and bags

Estimating a concrete pour comes down to volume: length times width times thickness, converted to cubic yards. These calculators handle the common shapes and tell you whether to order ready-mix or buy bags, with a waste allowance built in.

Concrete CalculatorYards, Bags, Weight & Cost→Concrete Slab CalculatorYards, Bags & Cost→Concrete Footing CalculatorYards & Bags→Sonotube CalculatorConcrete for Tube Forms→Concrete Stairs CalculatorYards & Bags→

Masonry walls

Block and brick counts, courses and mortar

Masonry is counted by the unit. We work out how many blocks or bricks cover your wall area, how many courses high it stands, and the bags of mortar to lay them, so you order the right amount the first time.

Concrete Block CalculatorBlocks & Mortar→Cinder Block CalculatorBlocks & Mortar→Block Wall CalculatorBlocks, Courses & Mortar→Brick CalculatorHow Many Bricks and Mortar→Brick Wall CalculatorBricks, Courses and Mortar→Retaining Wall CalculatorBlock Count→

Materials & reinforcement

Mortar, pavers and rebar

The pieces that go with the main pour: the mortar that binds masonry, the pavers for a patio, and the rebar grid that controls cracking in slabs and footings.

Mortar CalculatorBags for Block & Brick→Paver CalculatorPavers & Bedding Sand→Rebar CalculatorSlab Grid, Length & Weight→

More construction calculators

Materials, finishes, outdoor work and layout

Plan common construction materials and site work, from asphalt, gravel and roofing to drywall, flooring, fencing, stairs and surface coverage.

Asphalt CalculatorTons, Cubic Yards & Cost→Board Foot CalculatorLumber Volume & Cost→Curb and Gutter CalculatorConcrete Yards & Bags→Drywall CalculatorSheets, Screws & Mud Needed→Fence CalculatorPosts, Rails, Pickets & Concrete→Flooring CalculatorSquare Feet, Boxes & Cost→Gravel CalculatorTons, Cubic Yards & Cost→Pool Volume CalculatorGallons, Liters & Fill Time→Roof Pitch CalculatorAngle, Rafter Length & Area→Roofing CalculatorSquares, Bundles & Cost→Square Footage CalculatorArea in Sq Ft & Cost→Stair CalculatorRise, Run, Stringer & Code→Tile CalculatorTiles, Thinset & Grout Needed→Topsoil CalculatorCubic Yards, Bags & Cost→

Guides

How-to and cost guides that funnel into the calculators
Drywall Installation Cost WorksheetGuide→Brick Wall Cost Per Square Foot WorksheetGuide→Calculate Square Feet Calculator: Formula for Any ShapeGuide→Chain Link Fence Cost WorksheetGuide→Concrete Block Wall Cost Per Square Foot WorksheetGuide→Concrete Mix Ratio: Cement, Sand and AggregateGuide→Concrete Slab Cost Per Square Foot WorksheetGuide→Paver Driveway Cost WorksheetGuide→Brick Wall Cost WorksheetGuide→Concrete Slab Pour Cost WorksheetGuide→How to Size Deck FootingsGuide→How Deep Should a Footing Be?Guide→How Long Does Concrete Take to Cure?Guide→How Many 80 lb Bags of Concrete in a Yard?Guide→How Many Bags of Concrete in a Yard?Guide→How Many Bags of Concrete per Fence Post?Guide→How Many Bags of Mortar Per 100 Block?Guide→How Many Blocks to Build a Wall?Guide→How Many Bricks Do I Need?Guide→How Many Bricks Per Square Foot?Guide→How Many Bricks to Build a House?Guide→How Many Cinder Blocks Do I Need?Guide→How Many Concrete Blocks Do I Need?Guide→How Many Pavers Do I Need?Guide→How Many Pavers for a 10x10 Patio?Guide→How Many Retaining Wall Blocks Do I Need?Guide→How Much Concrete Do I Need for a Sonotube?Guide→How Much Concrete Do I Need?Guide→How Much Concrete for a 10x10 Slab?Guide→How Much Concrete for a Deck Footing?Guide→How Much Concrete for Stairs?Guide→Concrete Steps Cost WorksheetGuide→12x12 Concrete Slab Cost WorksheetGuide→20x20 Concrete Slab Cost WorksheetGuide→30x40 Concrete Slab Cost WorksheetGuide→Cinder Block Wall Cost WorksheetGuide→Concrete Curb Cost WorksheetGuide→Concrete Driveway Cost WorksheetGuide→Concrete Foundation Cost WorksheetGuide→Concrete Patio Cost WorksheetGuide→Concrete Sidewalk Cost WorksheetGuide→Paver Patio Cost WorksheetGuide→Paver Walkway Cost WorksheetGuide→How Much Does a Yard of Concrete Weigh?Guide→Concrete Cost Per Yard WorksheetGuide→Cinder Block Wall Cost WorksheetGuide→Rebar Cost Worksheet by Size and WeightGuide→How Much Gravel Under a Concrete Slab?Guide→How Much Mortar Do I Need?Guide→How Much Mortar for 1000 Bricks?Guide→How Much Paver Base Do I Need?Guide→How Much Rebar Do I Need?Guide→How Much Square Footage Is in an Acre?Guide→How Much Water Do I Need for Concrete?Guide→How Thick Should a Concrete Slab Be?Guide→How Thick Should a Garage Slab Be?Guide→How to Build a Concrete Block WallGuide→Planning a Segmental Retaining WallGuide→How to Calculate ConcreteGuide→How to Lay PaversGuide→How to Mix ConcreteGuide→How to Pour a Concrete SlabGuide→How Wide Should a Footing Be?Guide→Mortar Mix Ratio: Type N, S, M and O ExplainedGuide→Rebar Size Chart: Diameters, Areas and WeightsGuide→Rebar Spacing for a SlabGuide→Rebar Weight Per FootGuide→Retaining Wall Cost Per Square Foot WorksheetGuide→Retaining Wall Cost WorksheetGuide→Retaining Wall Estimator: How to Calculate Blocks and CostGuide→Square Footage Calculations: Formula, Sizes and CostGuide→Standard Brick SizesGuide→Standard Concrete Block SizesGuide→Types of ConcreteGuide→Waal Size Brick: Dimensions and QuantityGuide→What Size Rebar for a Driveway?Guide→What Size Rebar for a Slab?Guide→

How to estimate concrete

Concrete may be supplied by volume or as pre-mixed bags. Every estimate starts with volume: for a flat pour it is length times width times thickness, and for a round column it is the area of the circle times the height. Convert the thickness to feet, multiply through, then divide by 27 to get cubic yards. Use the concrete calculator and its shape-specific siblings to compare the calculated volume and bag count with the yield and ordering terms from your chosen supplier.

Always add a waste allowance. Trench bottoms are uneven, forms leak a little, and you cannot top up a pour once the truck leaves, so 5 to 10% extra and rounding up is normal rather than wasteful. For structural pours like driveways and footings, plan reinforcement too: size the rebar grid with the rebar calculator and follow your local code.

How to estimate masonry

Masonry is counted by the unit, not by volume. A standard concrete block covers about 0.889 square feet, so a square foot of wall takes 1.125 blocks; a modular brick covers about 21 square inches, or 6.75 bricks per square foot. Multiply your wall area by the units per square foot, add waste for breakage and cuts, and round up. The block and brick calculators also give the courses and the bags of mortar, using about 8 to 9 bags per 100 blocks and 28 per 1000 bricks.

Walls need more than units. Lay them on a level, cured footing, keep your mortar joints a consistent 3/8 inch, and reinforce tall or load-bearing walls with rebar in grouted cells. Retaining walls add drainage and a buried base course, and brick veneer needs ties, flashing and weep holes. Each calculator lists its sources so readers can review the material figures used.

Why these calculators

Every calculator here shows its formula, so you can check the math instead of trusting a black box. The numbers come from listed material sources rather than round guesses. Formula and declared-case checks run during the build; sources are listed for readers to review. Enter feet and inches the way you measure on site, or switch to metric, share or print your result, and order with confidence.