Inches to yards (in to yd)

One inch is exactly 1/36 of a yard. The 1959 international agreement defined the yard at exactly 0.9144 meters and the inch as a thirty-sixth of it, so this factor is part of the same definition.

Worked through: 36 in x 0.0277777778 = 1 yd.

Going the other way, one yard is 36 inches.

For mental arithmetic: Divide by 36: divide by 12 for feet, then by 3.

This is the direction for buying fabric, and the answer is never what you buy. 100 inches is 2.78 yards, but shops cut in eighths of a yard (4.5 inches each), so the order is 2 7/8. And a length of fabric is a strip off a bolt of fixed width, commonly 44 or 60 inches, so a pattern that needs a certain area converts to yards only after deciding how the pieces lie across that width. Working in inches and converting once at the end, then rounding up to the next eighth, is the method that leaves no garment a few inches short.

Precision is worth matching to the input. A measurement given as 9 in carries one or two significant figures, and reporting its conversion to six implies a precision the original never had.