Unit Conversion Calculator
The conversions a job actually asks for — area, volume, length, weight — in one table, with the project answer (yards of concrete, tons of gravel) one step away.
Factors are definitions (1 cu yd = 27 cu ft; 1 acre = 43,560 sq ft; US gallon = 231 cu in). Families do not convert into each other — a length never becomes an area here.
How the math works
Every unit carries a factor to its family’s base unit (inches, square inches, cubic inches, ounces), and the conversion is value × from-factor ÷ to-factor. The families do not mix: ask for feet → square yards and the page says so instead of printing a confident nonsense number.
The factors are definitions, not estimates: 1 cu yd = 27 cu ft exactly, 1 acre = 43,560 sq ft, 1 US gallon = 231 cu in, 1 lb = 16 oz, metric at the exact international definitions.
A worked example
10 cu ft = 0.370 cu yd (÷ 27). 500 sq ft = 55.56 sq yd (÷ 9). 2.5 acres = 108,900 sq ft. Three of the four conversions a materials order ever needs, each one line of arithmetic.
Questions from the field
How many cubic feet in a cubic yard? 27 exactly — 3 × 3 × 3. The Cubic Yard Calculator runs the full length × width × depth version for materials.
How many square feet in an acre? 43,560. A useful check: an acre is about 208.7 ft square.
Why does it refuse some conversions? A length cannot become an area without a second dimension. Tools that print an answer anyway are converting your typo into a wrong order — this one flags the family mismatch instead.
Are the gallons US or imperial? US gallons (231 cu in). Imperial gallons are about 20% larger — the difference matters on a big tank, which is why the page names the standard it uses.
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