How to use it
- Enter length in feet
- Enter width in feet
- Enter thickness in inches
- Read cubic yards, cubic feet, and bag estimate
What it does – The Lowes Concrete Calculator takes the length, width and thickness you input and instantly returns three useful numbers: total cubic feet, cubic yards (27 ft³ = 1 yd³), and how many 80‑lb bags you’ll need (each bag ≈ 0.6 ft³).
Why it matters – Knowing the exact volume prevents over‑ordering, saves money, and ensures the slab cures properly.
How to read the results – Cubic feet shows raw volume, cubic yards is the standard ordering unit for delivery trucks, and the bag count tells you how many mixes to purchase. Round up to the next whole bag to avoid shortfalls.
Pro tips
- Add 5‑10% extra for waste and spillage
- Round bag count up to the next whole bag
- Order concrete in full‑yard increments to match truck loads
- Double‑check thickness conversion from inches to feet
Real-life examples
- Building a 12 ft × 12 ft patio 4 in thick
- Pouring a 20 ft × 30 ft garage floor 6 in thick
- Creating a 8 ft × 10 ft walkway 3 in thick
Case study
Sam needed a 10 × 10 ft patio at 4 in depth. The calculator showed 1.2 yd³, 33.3 ft³ and 56 bags. He ordered 2 yd³ and 60 bags, avoided a costly shortfall, and finished on schedule.