Feet and Inches Calculator
Add and subtract feet, inches and fractions (and cm or mm), multiply or divide by a number, and get the answer in feet and inches to the nearest 1/16 inch.
Change the values and press Calculate to work out your own figures.
Type the lengths with + and −.
Show the working
- Each length is converted to inches exactly, then added, subtracted, multiplied or divided
- 122.125 in, rounded to the nearest 1/16″
How to use it
Type the lengths with + and −.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
Every length is converted to inches exactly (1 ft = 12 in, 1 in = 2.54 cm), combined, then written as feet and inches
Rounding
The exact answer is kept until the end, then rounded to the nearest fraction you choose; the decimal inches are shown too.
Questions
What is 4' 3 7/8" + 5' 10 1/4"?
10′ 2 1/8″.
What is 1 inch divided by 3?
21/64″ to the nearest 1/64.
Formulas
Every length is converted to inches exactly (1 ft = 12 in, 1 in = 2.54 cm), combined, then written as feet and inches
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.