Common feet and inches conversion mistakes
Avoid base-10 assumptions, premature rounding and mixed-unit input errors.
Twelve inches make one foot
Feet-and-inches arithmetic is mixed-radix. Treating 8 inches as 0.8 feet introduces a large error; it is 0.6667 feet.
Round once
Keep full precision during the calculation and round only the final tape-readable result.
Use the calculator
Accurate mixed measurement arithmetic rounded to the nearest 1/16 inch.
Open Feet & Inches Calculator