Feet and Inches Calculator

Created by Łucja Zaborowska, MD, PhD candidate
Reviewed by Dominik Czernia, PhD and Jack Bowater
Last updated: Sep 14, 2020

Why do we need the feet and inches calculators? Multiplying, dividing, subtracting, and adding in feet and inches might be quite troublesome - we all know it well enough. Converting decimals to fractions and vice versa is another obstacle to overcome. But don't you worry - our wonderful FIS (Foot-Inch-Sixteenth) calculator is here to help! 👣

In the article below, we'll briefly talk about incredible properties of our ft and inches calculator and how to make the most of it. We'll also teach you how to subtract feet and inches and deal with adding inches with fractions. 🦶

How to use the inch and foot calculator?

Are you struggling with subtracting feet and inches? Or is it adding inches with fractions that makes your head ache? No matter what the reason you came to this FIS (Foot-Inch-Sixteenth) calculator, we've got you covered!

  1. The recipe is simple: input the value of your choice in any format you want. You may enter:
  • Regular decimals (e.g., 2.5);
  • Fractions & divisions (e.g., 1/4, 1/32);
  • Integers along with fractions (e.g., 1 + 3/8, 2 + 4/2);
  • Multiplication (e.g. 3 * 4);
  • Subtraction (e.g., 4 - 1); and
  • Addition (e.g., 5 + 8).

If you value doesn't have feet or inches, enter 0 into the appropriate box in the calculator.

  1. Your result will depend on the type of calculation you choose. There are four available options:
  • ➕ Add feet and inches

Your result will consist of the calculated feet, inches, and fractional inches to the precision of your choice.

  • ➖ Subtract feet and inches

Your result will consist of the calculated feet, inches, and fractional inches to the precision of your choice.

  • ✖️ Multiply feet and inches

Your result will be shown in both square feet and square inches (ft², in²).

  • ➗ Divide feet and inches

Your results will not have a unit. Why is that? If you divide feet by feet, the identical units are removed, e.g., ft/ft = 1.

Once you know it all, it's time to check our other square footage calculators in feet and inches, like the price per square foot tool. 💰

Area calculator - feet and inches

You can use our feet and inches tool as a square footage calculator in feet and inches - you just need to choose the multiply option.

Obviously, using this FIS (Foot-Inch-Sixteenth) calculator is the simplest solution - but what if we wanted to compute the area all by ourselves? As an example, let's estimate the area of a kennel for our dog.

  1. Choose whether you'd like your result to be in square feet (ft²) or inches (in²).

In this example, we decided to use square inches.

  1. Convert your values in feet & inches to inches, e.g. with help of our length converter, which also works as an inches to feet and inches calculator (just select the corresponding units).

Our dog house's walls are 2 feet 6 inches long and 1 foot 5 inches wide. Let's convert ft and inches to inches:

1 ft 5 in = 17 in and 2 ft 6 in = 30 in

  1. Multiply your converted vales

17 in * 30 in = 510 in²

Yaay, you got it! 🎉

Hey, since you're already an expert in this field, how about checking our calculators similar to this area calculator - feet and inches:

How to add feet and inches?

Our feet and inches calculator's most popular option is add feet and inches. So, if want to find out how to add feet and inches, here's how to do it:

  1. Let's start with an easy example 😌 :

2 ft 3 in + 5 ft 6 in

This equation requires just a simple addition of feet and inches done separately: we're first adding feet 2 + 5 = 7 ft and then inches 3 + 6 = 9 in.

We then compile the complete result: 7 ft 9 in.

We only need to make sure that the number of inches is lower than 12, because 12 inches make one foot! This how you can convert inches to feet and inches.

  1. What about adding inches with fractions? 😮 How to add feet and inches in that case?

2 ft 10 1/4 in + 1 ft 2 9/16 in

  • We start by adding feet and inches separately:

2 + 1 = 3 ft

10 + 2 = 12 in = 1 ft - 12 inches creates an additional foot. We have 4 feet all together.

  • Now it's time to solve the fractions 1/4 and 9/16.

In order to do that, we need to find the smallest denominator possible for both of these fractions. Firstly, we'll be looking for the least common multiple (LCM).

Our denominators are 4 and 16, so their LCM is 16.
Let's change the denominators so that they're equal to each other, and multiply the numerator by the same number as its denominator:

(16/4 = 4; in this case we need to multiply them by 4)

1/4 + 9/16 = 4/16 + 9/16 = 13/16 in.

  • Since we've already computed the feet and inches, it's time to compile the results:

4 feet and 13/16 in

Go easy on yourself and try our simplify fractions and adding fractions calculators.

Pssst, for some specific cases (e.g., 1/4 + 8/16) you may also use the greatest common factor (GCF) and the remainder calculator. 🤓

Łucja Zaborowska, MD, PhD candidate
Don't hesitate to enter, for example, fractions:

• 1/4 • 78/64 • 5/8 • 1/2 • 5/16 •

or full numbers with fractions:

• 1+1/2 • 5+3/8 • 4+5/16 • 1+4/32 •
0 ft 0 in
Fraction inches:
0" = 0/1"
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