How Much Concrete Do I Need?
Calculate concrete volume from project dimensions, convert cubic feet to cubic yards, add waste, and estimate whole premix bags.
Read guideChoose the right concrete or masonry calculator
Use the project-specific tools below to estimate geometric volume or unit quantity. Each calculator states its assumptions and avoids pricing, structural sizing, and code interpretation.
What are you measuring?
Concrete volume by project
Start with the geometry that matches the work.
Concrete CalculatorCalculate concrete volume, cubic yards, and approximate bag quantities.→Concrete Slab CalculatorPlan concrete volume, surface area, and bags for one or more slabs.→Concrete Footing CalculatorCalculate concrete volume for repeated rectangular footings.→Concrete Driveway CalculatorEstimate concrete volume for one or more driveway sections.→
Bag quantities
Convert a known volume into an approximate whole-bag quantity using editable assumptions.
Masonry and paving units
Estimate whole-unit quantities from measured coverage.
How to choose
Use the general Concrete Calculator when you have ordinary rectangular sections and want volume plus several bag equivalents. Choose the Concrete Slab Calculator when top surface area and separate slab dimensions matter, the Concrete Footing Calculator for repeated rectangular footings, or the Concrete Driveway Calculator for multiple driveway sections.
If volume is already known, the Concrete Bag Calculator converts it to one selected bag size. For material-neutral rectangular volume, use the Cubic Yard Calculator. Blocks, bricks, and pavers use face or module area rather than concrete volume, so they have dedicated quantity calculators.
Measure with context
Browse all guidesConcrete & Masonry planning guides
How to Calculate Concrete for a Slab
Measure slab length, width, and thickness, then convert the resulting volume to cubic yards with a clearly stated waste allowance.
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