You measured the space twice. The stone yard still feels like a guess. Order short and work stops. Order too much and money sits in a pile. This stone calculator ends that back-and-forth before you call the supplier.
Stone Depth Guide by Project
Flagstone bases need 2 to 4 inches of compacted stone.
River rock beds look best at 3 to 4 inches depth.
French drain fill often uses 6 to 12 inches of clean stone.
How to Use This Stone Calculator
Measure length and width in feet. Convert depth to feet by dividing inches by 12. Enter all three values in the tool above. Read cubic feet, cubic yards, and weight if shown. Add 10% extra for compaction and spill loss.
Key Terms for Stone Calculator
When you use a stone calculator, these terms show up in inputs, results, or follow-up conversations: cubic yard, cubic foot, and square footage are core to most stone calculations. You may also see depth, compaction, and aggregate on reports, quotes, or assignments. Knowing what each field means prevents swapped inputs and misread results.
Stone Calculator Formula Explained
Area equals length times width in square feet. Volume in cubic feet equals area times depth in feet. Cubic yards equal cubic feet divided by 27. Decorative stone runs 2,400 to 2,800 lbs per cubic yard.
Real Example With This Stone Calculator
A 15 by 8 foot patio base at 3 inches needs 1.1 cubic yards of stone. River rock costs more per yard but needs less compaction than crushed limestone.
Why Stone Calculator Math Matters
Wrong stone math costs real money on delivery day. Trucks charge per load whether you fill the bed or not. A free tool lets you verify a contractor quote in minutes.
Common Mistakes With a Stone Calculator
Mixing inches and feet is the top error. Using compacted depth when you measured loose fill. Skipping the 10% buffer on irregular ground. Ordering by tons without checking material density.
Pro Tips for Better Stone Calculator Results
Call your supplier and ask which unit they bill in. Walk the area and note low spots that need extra depth. Save your result before you change unit settings. Compare bag count vs bulk price above two cubic yards.
Frequently Asked Questions
Multiply length × width × depth in feet. Divide by 27 for cubic yards.
Decorative stone runs 2,400 to 2,800 lbs per cubic yard.
Yes. Add 10% for compaction, spill, and uneven ground.
Use 3/4 inch clean crushed stone for French drains.
Yes. It works on mobile browsers with no app.
Homeowners, landscapers, and DIY builders ordering stone.
So Here's the Bottom Line
You have measurements, depth, and a supplier on speed dial. Run the stone calculator one more time with your real numbers. Order once. Finish the job without a second delivery fee.
Disclaimer: Material estimates vary by supplier and region.