You measured the space twice. The gravel yard still feels like a guess. Order short and work stops. Order too much and money sits in a pile. This gravel calculator ends that back-and-forth before you call the supplier.
Gravel Depth Guide by Project
Driveway base needs 4 to 6 inches of compacted crushed stone.
Walking paths work at 2 to 3 inches of smaller gravel.
Drainage layers often need 6 to 12 inches of clean aggregate.
Decorative beds use 2 to 4 inches over landscape fabric.
How to Use This Gravel 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 Gravel Calculator
When you use a gravel calculator, these terms show up in inputs, results, or follow-up conversations: cubic yard, cubic foot, and square footage are core to most gravel 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.
Gravel 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. Most gravel weighs about 2,700 to 3,000 pounds per cubic yard depending on type.
Real Example With This Gravel Calculator
A 40 by 12 foot driveway at 4 inches deep needs about 5.9 cubic yards. At 2.8 tons per yard, that is roughly 16.5 tons of crushed stone. Add 10% and call the quarry with 6.5 yards to be safe.
Why Gravel Calculator Math Matters
Wrong gravel 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 Gravel 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 Gravel 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.
Most gravel weighs about 2,700 to 3,000 pounds per cubic yard depending on type.
Yes. Add 10% for compaction, spill, and uneven ground.
About 1.4 to 1.6 tons per yard for crushed stone. Dense river rock can run heavier.
Use 4 to 6 inches of compacted base over prepared soil.
Pea gravel feels smooth underfoot. Crushed stone compacts harder for driveways.
Yes. It works on mobile browsers with no app.
Homeowners, landscapers, and DIY builders ordering gravel.
So Here's the Bottom Line
You have measurements, depth, and a supplier on speed dial. Run the gravel 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.