Cubic Yard Calculator
Ordering concrete, gravel, topsoil or mulch? Enter your project's length, width and depth in feet and inches to get the volume in cubic feet and cubic yards — plus an estimated material weight. Runs entirely in your browser.
📏 Length
📐 Width
📊 Depth e.g. a 4-inch slab = 0 ft 4 in
⚙️ Options
Frequently Asked Questions
How many cubic feet are in a cubic yard?
27. A cubic yard is a 3 ft × 3 ft × 3 ft cube, so divide cubic feet by 27 to get cubic yards. Example: 9 ft × 12 ft × 0.5 ft = 54 cubic feet = exactly 2 cubic yards.
How do I enter depth in inches?
Put 0 in the feet box and the inches in the inches box — a 4-inch slab is "0 ft, 4 in". The calculator converts everything to feet before doing the math.
How much does a cubic yard of concrete weigh?
A cubic yard of concrete typically weighs around 4,000–4,050 lb (about 2 tons). Gravel is roughly 2,800 lb per cubic yard, topsoil about 2,000 lb, and mulch far less at around 500–800 lb. These are typical values — actual weight varies with mix and moisture.
Should I add extra for waste?
Yes — 10% overage is the industry rule of thumb for most flatwork and landscaping. It covers spillage, uneven subgrade, and form overfill. For irregular shapes, consider 15%.
How many 80 lb bags of concrete are in a cubic yard?
An 80 lb bag of ready-mix yields about 0.6 cubic feet, and a cubic yard is 27 cubic feet — so roughly 45 bags per cubic yard. For anything over half a cubic yard, ordering ready-mix delivery is usually cheaper than bags.
Is this calculator private?
Yes. It runs 100% in your browser with no accounts and no servers — your measurements never leave your device.