How to use it
- Enter the length in feet
- Enter the width in feet
- Enter the thickness in inches and click Calculate
What it does – The calculator turns the dimensions of your driveway sub‑base into three practical units: cubic yards (the standard order size), the number of 80‑lb bags of mix, and cubic feet for on‑site checks. Why it matters – Ordering too little leaves gaps; ordering too much wastes money and space. Knowing the exact bag count lets you compare supplier quotes and schedule deliveries precisely. How to read – Cubic yards appear first; multiply by 27 if you need cubic feet. Divide the cubic‑foot total by 0.6 to see how many 80‑lb bags you’ll need, rounding up to the next whole bag. The results update instantly as you change any input.
Pro tips
- Add about 10% extra for spillage and compaction
- Round the bag total up to the next whole bag
- Order bags in full pallets when possible to lower shipping costs
- Double‑check thickness; a 2‑inch error can double the volume
Real-life examples
- Homeowner planning a new 12‑ft‑wide driveway
- Contractor estimating material for a 20‑ft‑wide commercial lot
- DIY enthusiast renovating an 8‑ft‑wide patio base
Case study
Mike needed a 15 × 30 ft driveway with a 4‑in. sub‑base. Using the calculator he saw he required 1.48 cubic yards, about 67 bags. He ordered 70 bags, avoiding a costly short‑fall and finished on schedule.