How to use it
- Enter length in feet
- Enter width in feet
- Enter depth in inches
- Read cubic yards, cubic feet, and ton estimate
The Sub Base Calculator turns the three dimensions of your project—length, width and depth—into the three most useful measures for ordering material. It first converts depth to feet, then multiplies length × width × depth to give cubic feet. Dividing cubic feet by 27 yields cubic yards, the standard unit for bulk deliveries. Multiplying cubic yards by 1.4 provides an approximate weight in US tons, helping you budget for transport and labor. For example, a 10 ft × 10 ft area at 6 in depth equals 50 cu ft, which is about 1.85 cu yd and roughly 2.6 tons. Use these numbers to order the right amount without costly over‑ or under‑ordering.
Pro tips
- Add 5‑10% extra for compaction and spillage
- Round up to the nearest whole cubic yard for ordering
- Compare supplier minimum loads to avoid extra fees
- Double‑check depth conversion from inches to feet
Real-life examples
- A DIY homeowner planning a new patio base
- A contractor estimating material for a driveway repair
- A landscaper preparing a garden path foundation
Case study
Jane needed a 12 ft × 8 ft patio base 4 in deep. The calculator showed 2.96 cu yd (≈4.1 tons). She ordered 3 cu yd, saved on excess material, and completed the patio on budget.