Conversions
quick referenceQuick Reference
Common construction conversions, all in one place, for quick reference without doing the math yourself.
About These Conversions
These are the unit conversions that come up most often on job sites and in material takeoffs — length, area, volume, and weight equivalents used throughout the calculators on this site. Keeping them on one page means you don't have to do the math by hand when you're just checking a quick figure.
Why Cubic Yards Matter in Construction
Concrete, mulch, soil, and gravel are almost always sold and priced by the cubic yard, not the cubic foot — which is why so many calculators on this site convert your measurements (usually taken in feet and inches) into cubic yards at the end. Knowing that 1 cubic yard equals 27 cubic feet lets you sanity-check any volume calculation without a calculator.
Frequently Asked Questions
Why is a gallon of water not exactly a cubic foot?
A cubic foot of water is about 7.48 gallons, not 1 — cubic feet measure volume by physical space, while gallons are a separate liquid-volume unit. The two happen to have a fixed conversion rate but aren't interchangeable without doing the math.
Why do building materials use acres and square feet differently?
Acres are typically used for land and lot sizing, while square feet are used for smaller-scale material takeoffs like flooring, roofing, or paint coverage. One acre equals 43,560 square feet — useful to know if you're converting a lot size into a more usable unit for a specific material estimate.
Where do these conversion figures come from?
These are standard, fixed conversion factors defined by the U.S. customary and imperial measurement systems — they don't change based on material or manufacturer, unlike things such as bag yields or paint coverage rates, which vary by product.