Concrete & Masonry Calculators

Estimate concrete, block, brick, mortar, pavers and rebar with calculators that show the formula, use real material data, and build in a waste factor. 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 CalculatorBricks & Mortar Needed→Brick Wall CalculatorBricks, Courses & 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→

Guides

How-to and cost guides that funnel into the calculators
Concrete Mix RatioGuide→How Much Does It Cost to Pour a Concrete Slab?Guide→How Long Does Concrete Take to Cure?Guide→How Many Bags of Concrete in a Yard?Guide→How Many Cinder Blocks Do I Need?Guide→How Much Concrete Do I Need?Guide→How Much Does a 12x12 Concrete Slab Cost?Guide→How Much Does a Concrete Driveway Cost?Guide→How Much Does Concrete Cost?Guide→How Much Paver Base Do I Need?Guide→How Thick Should a Concrete Slab Be?Guide→How to Calculate ConcreteGuide→Rebar Size Chart: Diameters, Areas and WeightsGuide→How Much Does a Retaining Wall Cost?Guide→Standard Concrete Block SizesGuide→Types of ConcreteGuide→

How to estimate concrete

Concrete is sold by the cubic yard for ready-mix or by the bag for pre-mixed. 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. Above about one cubic yard, ready-mix delivered is cheaper and faster than mixing bags by hand, so the concrete calculator and its shape-specific siblings tell you which way to go and round ready-mix up to the nearest quarter yard, which is how it is ordered.

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 6.86 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 verified pre-mixed coverage of 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 covers the specifics, and the figures are cross-checked against manufacturer spec sheets and standards like ASTM C90 and C270.

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 real material data, an 80 lb concrete bag yields about 0.60 cubic feet, drawn from standards and manufacturer figures rather than round guesses, and every formula is verified with automated tests on each build. Enter feet and inches the way you measure on site, or switch to metric, share or print your result, and order with confidence.