Estimate Concrete For Continuous Foundation Footers, Rectangular Pads And Square Post Footers From Simple Feet And Inch Measurements. The Calculator Converts Your Dimensions Into Cubic Feet And Cubic Yards, Adds Your Chosen Waste Allowance, Estimates Whole Bags From The Yield You Enter And Builds A Concrete-Only Budget From Your Local Price Per Cubic Yard.
Select A Footer Type, Enter The Actual Dimensions From Your Plans Or Site Measurements, Then Press Calculate. Every Numeric Field Shows A Clean Zero Placeholder Only, So Typing 25 Produces 25 — Not 025.
Your Result Will Appear Here After You Press Calculate Footer Concrete.
The PDF Includes The Project Type, Measurements, Waste Allowance, Cubic Feet, Cubic Yards, Bag Estimate And Concrete-Only Cost.
A Continuous Footer Is A Long Rectangular Volume. Convert Width And Depth From Inches To Feet, Multiply By The Footer Length, Then Divide Cubic Feet By 27 To Convert The Result To Cubic Yards.
The Tool Separates Basic Geometry From Structural Design. You Enter The Required Footer Dimensions; The Calculator Converts Them Into Concrete Quantity, Then Applies Your Own Waste, Bag Yield And Pricing Inputs.
See The Ready-Mix Quantity In Cubic Yards For Ordering And Quote Comparison.
View The Unrounded Geometric Volume In Cubic Feet Before Converting To Yards.
Add A User-Controlled Percentage For Excavation Variation, Formwork And Real Site Conditions.
Enter The Actual Product Yield Per Bag Instead Of Assuming Every Bag Produces The Same Volume.
Use Your Supplier Price Per Cubic Yard Plus Any Delivery Or Other Quoted Fees.
Save The Key Measurements And Calculated Quantity For Easy Reference Or Quote Checking.
A concrete footer, more commonly called a concrete footing in construction documents, spreads the load from a wall, column, pier or other structural element into the supporting soil. From a quantity-estimating point of view, many footers are simple rectangular volumes. That makes the basic math straightforward, but the estimate is only as reliable as the dimensions you enter.
The Concrete Footer Calculator is designed for quantity planning rather than structural design. It does not decide how wide or deep a foundation footer should be. Those dimensions can depend on building loads, soil conditions, frost exposure, local requirements, reinforcement details and project-specific engineering. Use the actual dimensions required by your approved drawings, engineer, builder or applicable code documents.
Cubic feet = Length (ft) × Width (ft) × Depth (ft)When footer width and depth are measured in inches, divide each inch measurement by 12 before multiplying. For example, an 18-inch width becomes 1.5 feet and an 8-inch depth becomes about 0.667 feet. After calculating cubic feet, divide by 27 to convert cubic feet to cubic yards.
Ready-mix concrete in the United States is commonly discussed and quoted by cubic yard. One cubic yard equals 27 cubic feet. A footer calculation may begin with feet and inches because those units are convenient on plans and at the excavation, but converting the result to cubic yards makes it easier to compare the estimate with a concrete supplier quote. For another imperial-volume tool, use the Concrete By The Yard Calculator.
| Dimension | Feet | Volume Factor Per Linear Foot | Cubic Yards Per 100 Linear Feet |
|---|---|---|---|
| 12 in wide × 6 in deep | 1.00 ft × 0.50 ft | 0.50 ft³ | 1.85 yd³ |
| 16 in wide × 8 in deep | 1.333 ft × 0.667 ft | 0.89 ft³ | 3.29 yd³ |
| 18 in wide × 8 in deep | 1.50 ft × 0.667 ft | 1.00 ft³ | 3.70 yd³ |
| 24 in wide × 10 in deep | 2.00 ft × 0.833 ft | 1.67 ft³ | 6.17 yd³ |
Measure the total centerline or actual formed length according to the way the footer will be poured. If the foundation has several straight runs with different widths or depths, calculate them separately. Adding unlike sections into one average dimension can hide a meaningful quantity difference. Corners can also create overlap if separate runs are measured carelessly, so use one consistent takeoff method.
A rectangular pad footer is calculated with the same three-dimensional formula: length × width × depth. The difference is that a pad has a finite length and width instead of a long continuous run. If several identical pads are required, calculate one pad and multiply by the number of pads. The calculator's Rectangular Pad mode does this automatically.
Square footers beneath posts or columns can be calculated by multiplying side × side × depth. The calculator lets you enter the side and depth in inches, then multiplies by the number of identical footers. If your project uses round piers or cylindrical footings, use a dedicated round-post or pier calculator instead of treating the cylinder as a square.
A neat formed footer can often be measured more predictably than concrete placed directly into an excavated trench. Soil can crumble, trench walls can widen, bottoms can vary in elevation and corners can become irregular. Those differences are one reason a quantity estimate may include a contingency allowance rather than ordering exactly the theoretical geometric volume.
Excavation also introduces safety issues that are separate from concrete quantity. OSHA maintains guidance on trenching and excavation safety. An online volume calculator is not a substitute for excavation planning, competent-person inspection, protective systems or site-specific safety procedures.
There is no universal waste percentage that suits every footer. A carefully formed, accessible footing with verified dimensions can be more predictable than an irregular hand-dug trench. Instead of automatically applying a fixed percentage, use the waste field to reflect the accuracy of the excavation, the number of separate sections, expected spillage, uneven bottoms and the supplier's ordering rules.
Before finalizing a ready-mix order, remeasure the excavation or forms after preparation is complete. Also ask the supplier about minimum loads, order increments, short-load charges, delivery access and waiting-time policies. The separate Concrete Delivery Calculator can help organize delivery-related planning.
Bagged concrete can be practical for a few small post footers, isolated pads or repair work where truck access is difficult. However, bag weight alone does not tell you the exact finished volume. Different products can state different yields. Enter the manufacturer-stated cubic-foot yield per bag into the calculator and it will divide the required concrete volume by that yield, rounding up to whole bags.
Bags = Required cubic feet ÷ Product yield per bagCheck the current product data sheet before purchasing a large quantity. If the bag-yield field is left at zero, the calculator does not invent a generic yield.
The calculator includes an editable price-per-cubic-yard field plus a separate delivery or other-fees field. This makes the budget reflect your actual supplier quote rather than a national average. Concrete cost can vary by market, mix specification, quantity, distance, access, minimum-load policy and additional services. The estimate is concrete-only unless you deliberately add other charges into the fee field.
Excavation, formwork, reinforcing steel, anchor bolts, pumping, placing, finishing, inspections, labor, engineering and site restoration can all be separate project costs. For broader material pricing, compare the result with the Concrete Material Cost Calculator.
The Concrete Footer Calculator does not determine soil bearing capacity, footing width, footing thickness, frost depth, reinforcement size, reinforcing placement, concrete strength, column load, wall load, settlement, drainage, waterproofing or structural adequacy. Those are design and construction decisions. Use approved project documents and qualified professional guidance where required.
These Examples Demonstrate Volume Math Only. They Do Not Recommend Structural Footer Dimensions For Any Building.
| Example | Dimensions | Base Cubic Feet | Base Cubic Yards | With 10% Allowance |
|---|---|---|---|---|
| Continuous Footer A | 40 ft × 16 in × 8 in | 35.56 ft³ | 1.32 yd³ | 1.45 yd³ |
| Continuous Footer B | 80 ft × 18 in × 8 in | 80.00 ft³ | 2.96 yd³ | 3.26 yd³ |
| Rectangular Pad | 4 ft × 4 ft × 12 in | 16.00 ft³ | 0.59 yd³ | 0.65 yd³ |
| Four Square Footers | 24 in × 24 in × 12 in × 4 | 16.00 ft³ | 0.59 yd³ | 0.65 yd³ |
Common Questions About Footers, Footings, Cubic Yards, Bags, Waste And Foundation Concrete Quantity.
For a rectangular continuous footer, multiply length by width by depth using consistent units. If width and depth are in inches, divide each by 12 to convert them to feet. The result is cubic feet; divide by 27 for cubic yards.
People often use “footer” informally when referring to a foundation footing. Construction drawings and codes more commonly use the term footing. This calculator targets the common “concrete footer calculator” search phrase while applying standard rectangular-volume math.
One cubic yard contains 27 cubic feet.
Yes. Use Strip Footer mode and enter the total length in feet plus footer width and depth in inches.
Yes. Rectangular Pad mode calculates length × width × depth and multiplies by the number of identical pads.
Yes. Use Square Post Footer mode, enter the side dimension, depth and number of identical footers.
There is no single percentage for every excavation. Use an allowance that reflects measurement accuracy, soil conditions, trench irregularity, formwork, spillage and supplier order rules.
Enter the actual cubic-foot yield per bag from the product data sheet. The calculator divides the required volume by that yield and rounds up to whole bags.
No. The calculator uses only the ready-mix price per cubic yard plus any amount you enter in the delivery/other-fees field. Reinforcement, excavation, forms, labor and other project costs are separate.
The visible zero is a placeholder rather than an entered value. Typing 25 produces 25, not 025, and the number remains clear with no blur effect.
The result remains hidden until you press Calculate Footer Concrete so placeholder values are not mistaken for a completed estimate.
No. It calculates volume only. Required footer width, depth, reinforcement and structural details must come from the requirements for your actual project.
Use Current Project Documents, Supplier Information And Appropriate Safety Guidance Alongside Any Online Footer Quantity Estimate.
Official Construction Safety Information For Trenching And Excavation Hazards.
Read OSHA GuidanceIndustry Resources Related To Ready-Mixed Concrete And Concrete Construction.
Visit NRMCAPlan Concrete Quantity, Delivery Loads And Delivery-Related Costs.
Open Delivery CalculatorUse Related Concrete Quantity, Cost, Coverage And Conversion Calculators To Cross-Check Your Estimate.
Browse Concrete Tools