How to use it
- Enter length in feet.
- Enter width in feet.
- Enter thickness in inches.
- Read the cubic yards, bags and cubic feet results.
The Cement Footing Calculator instantly turns the three dimensions of your footing—length, width and thickness—into the concrete volume you’ll need. It first computes the cubic‑feet space, then shows the equivalent cubic yards (27 ft³ = 1 yd³) and how many 80‑lb bags are required, using the industry standard that one bag yields 0.6 ft³. Knowing these numbers lets you order the right amount of material, avoid costly over‑orders, and keep your project on schedule. Example: a 10 ft × 5 ft footing 6 in thick equals 25 ft³, which is 0.93 yd³ and about 42 bags (rounded up). Read the results column‑wise: cubic yards for delivery, bags for purchasing, cubic feet for on‑site checks.
Pro tips
- Add a 10% waste allowance to the bag total.
- Always round the bag count up to the next whole bag.
- Order a few extra bags for future repairs or miscalculations.
- Convert thickness from inches to feet by dividing by 12 before entering.
Real-life examples
- A homeowner planning a new deck foundation needs to know how much concrete to order.
- A contractor estimating material for a small commercial building’s footings.
- A DIY enthusiast building a garden retaining wall wants to avoid ordering too much concrete.
Case study
John entered a 12 ft × 8 ft × 8 in footing, got 0.99 yd³ and 33 bags, ordered exactly that amount, and completed his patio on budget without leftover mix.