Inches, feet, yards and miles; ounces and pounds; cups, quarts and gallons — the units American classrooms actually use, with conversions that come out whole.
Grade 3–Grade 7 · every refresh draws a new set · answer key included
Customary units worksheets
Convert each measurement.
Customary units worksheets — answer key
Convert each measurement.
20 problems · US Letter · answer key — 2 sheets, page breaks marked in the preview
Customary units are harder than metric for one reason: the steps are not powers of ten and there is no pattern to fall back on. Twelve inches to a foot, three feet to a yard, sixteen ounces to a pound, four quarts to a gallon — each has to be known, and the practice is as much recall as arithmetic. That is exactly why the page exists: a class in the United States needs these conversions fluently, and no amount of metric practice will supply them.
Grade 3 to Grade 7, ages eight to thirteen, primarily American and Canadian classrooms. Inches and feet come first, usually in Grade 3; capacity and weight follow; miles and yards belong in Grade 5 and up where the numbers get large.
One measure at a time, and expect the recall of the factor to be the hard part rather than the multiplication. Leaving whole-number answers on keeps the arithmetic clean — 30 inches in feet is 2.5, which is a decimal question layered on a conversion. It is worth pairing this page with the metric one occasionally, because the contrast makes the point about powers of ten better than any explanation.
Using the wrong factor between the pair is the dominant error — dividing feet by twelve instead of multiplying, or converting quarts with the gallon factor. The second is applying the size check backwards, which happens more here than in metric because there is no pattern to reinforce it: converting to a smaller unit still gives a bigger number, whatever the factor happens to be.