Tape measures, lumber dimensions, door heights, and clothing sizes all use feet and inches together — but calculators, spreadsheets, and many online tools return measurements as a single number in decimal inches. Knowing how to convert 67 inches into 5 feet 7 inches (rather than just "67 inches") makes your measurements readable, communicable, and compatible with the way building materials and standard sizes are actually labeled.
There are 12 inches in a foot. To convert a total number of inches into feet and inches:
Or in a single step: divide by 12. The quotient's whole number is your feet; the remainder is your inches.
If you're working with a decimal result from a calculator, you can also use:
For example, 75 inches ÷ 12 = 6.25. The whole number is 6 (feet). The remainder: 75 − (6 × 12) = 75 − 72 = 3 inches. So 75 inches = 6 feet 3 inches.
A contractor measures a rough opening for a window and gets a reading of 86 inches. The window spec sheet lists height in feet and inches. Here's how to convert:
Step 1: Divide 86 by 12.
86 ÷ 12 = 7.166…
Step 2: Take the whole number as feet.
7 feet
Step 3: Multiply whole feet back by 12 and subtract from total.
7 × 12 = 84
86 − 84 = 2 inches
Result: 86 inches = 7 feet 2 inches
Now suppose the measurement came back as 86.5 inches (half-inch precision from a digital measuring tool):
86.5 ÷ 12 = 7.208…
Whole feet: 7
Remaining: 86.5 − 84 = 2.5 inches
Result: 7 feet 2½ inches — written on a work order as 7'2½".
The fractional inches part is where most people get tripped up. Keep the decimal remainder as-is and convert it to a fraction: 0.5 = ½, 0.25 = ¼, 0.75 = ¾, 0.125 = ⅛. These correspond directly to the standard markings on a tape measure.
1. Rounding the division result instead of taking the remainder.
If 86 ÷ 12 = 7.166, some people round to 7.2 feet and stop there — leaving the measurement as a decimal foot rather than converting the 0.166 into inches. That's fine for rough estimates, but useless when you need to mark a cut line on lumber. Always work through to whole feet plus whole-and-fractional inches.
2. Forgetting that 12 inches = 1 foot, not 10.
We work in base-10 for most things, so the instinct to divide by 10 is strong. Inches and feet are base-12. Dividing a total inch measurement by 10 gives a wrong answer every time. Double-check your divisor before calculating.
3. Misreading decimal feet as feet-and-inches.
A dimension listed as "6.5 feet" is NOT 6 feet 5 inches — it's 6 feet 6 inches (since 0.5 feet × 12 = 6 inches). This confusion shows up constantly when people pull dimensions from plans drawn in decimal feet. Always convert decimal feet to inches by multiplying the decimal portion by 12 before writing the measurement on anything.
1. Reading height measurements from medical or fitness data.
Health records and fitness apps often store height as total inches — 70 inches, 64 inches. Converting to feet and inches (5'10" and 5'4") makes those numbers immediately meaningful for everyday reference, comparisons, and filling out forms that ask for height in feet and inches.
2. Cutting lumber or pipe to spec.
Construction plans often list dimensions in a mix of units. If your plan says a shelf is 45 inches long and your tape measure is marked in feet, knowing that 45 inches = 3 feet 9 inches lets you find the mark in one step without counting inch by inch from the 3-foot mark.
3. Ordering custom-sized products.
Window blinds, shower doors, and curtain rods are all sized in feet and inches. If you've measured your window width as 38 inches using a metal tape, you need to convert to 3'2" before placing the order — most manufacturers don't accept total-inch dimensions on their order forms.
How do I write feet and inches correctly?
The standard notation uses the prime symbol for feet and double-prime for inches: 5'7" means 5 feet 7 inches. In written text, "5 feet 7 inches" or "5 ft 7 in" are both clear. Avoid writing "5.7 feet" when you mean feet-and-inches — that's a different number.
What is 100 inches in feet and inches?
100 ÷ 12 = 8 remainder 4. So 100 inches = 8 feet 4 inches.
How do I convert feet and inches back to total inches?
Multiply the feet by 12 and add the inches: (feet × 12) + inches = total inches. For 5'11": (5 × 12) + 11 = 71 inches.
What if I have a measurement in feet with a decimal, like 5.75 feet?
Multiply the decimal portion by 12 to get inches: 0.75 × 12 = 9 inches. So 5.75 feet = 5 feet 9 inches. This comes up constantly when working with dimensions exported from design software or spreadsheets.
Divide total inches by 12 — whole number is feet, remainder is inches. Convert decimal remainders to standard fractions to match your tape measure. Two steps, no guesswork, no mis-cuts.