Concrete Calculator – Instantly Calculate Yards, Volume & Cost
If you need a fast and accurate way to estimate concrete for your project, this concrete calculator makes it simple. Whether you are pouring a slab, forming footings, setting posts, building stairs, or creating a wall, you can calculate volume and yardage in seconds.
Concrete Calculator + Visualizer
How to Use This Concrete Calculator
This concrete calculator helps you estimate cubic yards, bag quantities, and ready mix pricing for slabs, footings, walls, stairs, and foundations. Follow the steps below to enter your dimensions correctly and calculate accurate concrete volume for your project.
View step-by-step instructions
Using this concrete calculator is straightforward:
- Select your project type.
Choose slab, square footing, wall, stairs, round footing, or circular tube. - Enter your dimensions.
Input length, width, height, depth, or diameter based on your selected shape.
Measurements can be entered in feet and inches, or metric units where available. - Add waste if required.
Turn on the 10 percent waste option if you want to account for spillage or uneven grading. - Review calculated volume.
The calculator instantly converts your inputs into cubic feet and cubic yards. - Compare material options.
See how many 40 lb, 60 lb, or 80 lb bags you need, and compare those totals with ready mix delivery pricing. - Download your report.
Generate a PDF summary to share with suppliers or keep for budgeting.
If your project also includes interior renovation work, you may find these related calculator tools helpful:
Each calculator works independently, but together they help you plan remodeling and construction projects with better accuracy and confidence.
How Much Concrete Do I Need?
To determine how much concrete you need, you must calculate total volume based on length, width, and thickness. This section explains the formulas used for slabs, footings, walls, and other common project types so your cubic yard estimate matches real jobsite measurements.
View concrete volume formulas
Concrete Slab Calculator Formula
To calculate a slab, multiply length × width × thickness. Always convert thickness from inches to feet before multiplying.
For example, a 10 ft × 10 ft slab at 4 inches thick equals 10 × 10 × (4 ÷ 12) = 33.33 cubic feet.
Divide by 27 to convert to cubic yards.
Concrete Footing Calculator Guide
For square footings, multiply size × size × depth. If your footing is 2 ft × 2 ft and 12 inches deep,
convert depth to feet (12 ÷ 12 = 1). Then calculate 2 × 2 × 1 = 4 cubic feet per footing.
Multiply by the total number of footings for overall volume.
Concrete Wall Volume Calculation
Wall volume is calculated by multiplying length × height × thickness.
Convert thickness from inches to feet before calculating.
For example, an 8 inch thick wall must be converted to 0.67 feet before multiplying.
Converting Cubic Feet to Cubic Yards
A concrete yard calculator works by converting cubic feet into cubic yards.
Since one cubic yard equals 27 cubic feet, divide total cubic feet by 27 to determine the number of yards required for delivery.
This section explains how the concrete calculator determines volume for different project types.
Below are the formulas and methods used for each calculation.
Concrete Cost Per Yard and Bag Estimates
Concrete pricing depends on whether you order ready mix by the cubic yard or purchase bagged concrete for smaller projects. This section explains cost per yard, bag yield calculations, waste factors, and how to compare delivery pricing with retail bag totals.
View detailed cost breakdown
Concrete Cost Per Yard Explained
Concrete cost per yard varies by region, supplier, and order size. Most ready mix suppliers charge per cubic yard,
with possible minimum load requirements or short load fees. Multiply your total cubic yards by the price per yard
to estimate material cost before delivery fees.
How Many Bags of Concrete Do I Need?
If you are using bagged concrete instead of ready mix, divide total cubic feet by the yield per bag.
An 80 lb bag yields about 0.60 cubic feet, a 60 lb bag yields about 0.45 cubic feet,
and a 40 lb bag yields about 0.30 cubic feet.
For current pricing examples, you can review a typical
80 lb concrete mix product listing
to compare retail costs in your area.
Always round up to ensure full coverage.
Concrete Calculator With Waste Factor
A concrete calculator with waste helps prevent shortages during a pour.
Adding 10 percent extra material accounts for spillage, uneven subgrade,
over excavation, and form variations.
For large pours, contractors often include waste automatically to avoid delays.
Ready Mix vs Bagged Concrete Cost Comparison
For small projects, bags may be practical.
For larger slabs, driveways, or foundations, ready mix delivery is usually more efficient and consistent.
The calculator compares both options so you can determine the most cost effective solution for your project size.
This section explains pricing, waste factors, and bag calculations in clear detail so you can estimate
material costs accurately before ordering.
Concrete Calculator by Project Type
Different concrete projects require different measurements and thickness considerations. Whether you are pouring a patio, driveway, footing, wall, stairs, foundation, or sonotube, this section explains what to measure so your concrete volume calculation reflects real jobsite conditions.
View project measurement guide
Concrete Patio Calculator
Concrete patio calculators require measuring the finished length and width, then confirming planned thickness. Most patios use a uniform thickness, so accurate measurements and a clean form layout make the biggest difference. If your patio has curves or multiple rectangles, break it into simple shapes and add the totals.
Driveway Concrete Calculator
A driveway often needs more attention than a patio because thickness and reinforcement choices vary by use. Measure the full length and width, then set thickness based on expected traffic. If you plan a thicker apron or thickened edges, estimate those areas separately and add them to the total before ordering.
Concrete Footing Calculator
Footings are usually poured below grade, so measure the footing width and length from your layout lines, then use the actual trench depth. If you have multiple footings, enter one footing size and multiply by quantity. This helps prevent under ordering when trench sides are uneven.
Concrete Wall Calculator
For walls, measure total wall length and height, then confirm thickness. If your wall has openings, you can estimate the full wall first and subtract large voids for doors or windows. For small openings, many builders keep the full volume and treat it as a buffer for waste.
Concrete Stairs Calculator
Stairs require accurate run, rise, width, step count, and landing length. Enter each value and use the 3D preview to confirm the layout before ordering. This is also a good time to add a small buffer since stair forms can shift during setup.
Foundations, Sonotubes, Columns, and Piers
If you are planning structural work, use the round and tube options to estimate cylindrical pours. This is useful for a concrete calculator for foundation planning, pier bases, and post holes. For tube forms, measure diameter and depth carefully, then multiply by quantity for repeated pours. If you are working with tube forms specifically, a concrete calculator for sonotube pours is the fastest way to estimate volume without doing circle math by hand. For supplier quotes, the concrete calculator ready mix pricing fields can help you compare delivery costs against bag totals.
Choose the project type that matches what you are pouring. Each example above explains what to measure so your concrete calculator results match real jobsite conditions.