How to use it
- Enter length in feet.
- Enter width in feet.
- Enter thickness in inches.
- Enter price per cubic yard and click Calculate.
What it does – The calculator turns your shed dimensions and material price into concrete quantities you can order. You input length, width, thickness, and price per cubic yard; it returns the volume in cubic yards, the estimated cost, the number of 80‑lb bags (each 0.6 ft³), and the volume in cubic feet. Why it matters – Knowing exact volumes prevents over‑ordering, saves money, and ensures a stable base. Reading the results – Cubic yards is the metric the supplier uses for pricing; multiply by your price per yard for cost. Divide cubic feet by 0.6 to see how many bags you’ll need, then round up to the next whole bag. You can also factor a 5‑10% waste allowance to cover spillage or uneven subgrade, then recalculate to keep your budget on track.
Pro tips
- Add 5‑10% extra volume for waste allowance.
- Round the bag count up to the next whole bag.
- Order bags in multiples of 10 for better pricing.
- Double‑check thickness conversion from inches to feet.
Real-life examples
- Homeowner building a 12x10 ft shed needs to know concrete needed.
- Contractor estimating material for a community garden shed.
- DIY enthusiast budgeting for a backyard tool shed base.
Case study
Mike measured a 10 × 12 ft shed with 4 in thickness, entered $150 per cubic yard, and the calculator told him he needs 1.48 cubic yards, $222 cost, and 4 bags. He ordered 5 bags, saved $30 on excess material, and finished the base on schedule.