About Online Cubic Feet Calculator
We built Online Cubic Feet Calculator because working out volume shouldn’t require a spreadsheet, a search through old formulas, or five browser tabs open at once. Whether you’re measuring a moving box, ordering mulch for a garden bed, sizing a shipment, or just settling a quick argument about how much a cubic foot actually is, the tool is built to give you a straight, accurate answer in seconds.
What we built
The calculator handles eleven different shapes, not just boxes — cylinders, cones, spheres, tapered containers, and more. It accepts measurements the way people actually write them, including mixed feet and inches like 5′ 6″, not just plain decimals. Every result converts automatically to cubic yards, cubic metres, litres, and gallons, and shows the full working behind the number, so you can check it or learn from it.
Beyond the core calculation, the tool estimates material weight, bag counts for landscaping materials, shipping volumetric weight, and rough cost — the kind of practical detail people actually need once they have a volume figure in hand.
Why it’s free
There’s no sign-up, no paywall, and no advertising on this site. We think a calculator this commonly needed should be fast, clean, and available to anyone without friction. The site is funded simply by being useful enough that people come back to it.
Accuracy matters to us
Every formula on this site is standard, published mathematics — nothing approximated or simplified in a way that sacrifices correctness. Where a result depends on variable factors, like material density or moisture content, we say so plainly rather than presenting a false level of precision.
Your privacy
We don’t collect measurements you enter, and the calculator runs entirely in your browser — nothing you type is sent to a server. The “copy link” feature stores your inputs in the URL itself, not in any database, so a shared link works without creating an account or a record anywhere.
Get in touch
If you spot something that looks wrong, have a shape or conversion you’d like added, or just want to say the tool saved you time, we’d like to hear from it. Reach us through the contact page.