Add or subtract lengths in inches (decimal or fraction), feet, centimeters, and millimeters. Enter equations just lượt thích you would write it on paper, e.g. 4′ 3 7/8″ + 5 cm.

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See the results in inches, feet, centimeters, and millimeters – all results are in imperial and metric.


How to showroom or Subtract Feet & Inches

Calculating feet and inches might seem complicated, but adding and subtracting measurements is actually really easy if you follow a few simple steps. While it’s easy to add or subtract feet and inches using a measurement calculator like the one above, if you follow a few basic steps, you can do it yourself!

Step One: Convert Feet & Inches khổng lồ Decimal

The first thing to bởi vì when adding, subtracting, or doing other math with inches, feet, and other measurements is to lớn convert all the measurements into a common unit of measure. For example, when reading a tape measure, inches will be in fraction form.

Start by converting inch fractions into decimals. Then convert feet, centimeters, & millimeters khổng lồ inches.

Convert inch fractions lớn decimal by dividing the bottom half of the fraction by the bottom half on a calculator. If there is a whole number, add it khổng lồ the decimal value after converting.

You can also use an inch fraction calculator to lớn quickly find the decimal value for an inch fraction.

For example:3/8 = 3 ÷ 8 = .375 inches

Convert feet lớn inches by multiplying the number of feet by 12, since there are 12 inches in a foot. Using a foot to lớn inch conversion calculator also simplifies this step.

For example:3 feet = 3 × 12 = 36 inches

Try our length converter to lớn convert other units khổng lồ decimal inches.

Step Two: địa chỉ or Subtract the Converted Values

With your feet và inch measurements in an inch decimal form, địa chỉ or subtract them as you normally would, using a calculator as needed. The final result will be the length in inches; you can convert the result lớn any other unit at this point.

To express the sum or difference value in feet, simply multiply by 12.

The following charts simplify the process of adding and subtracting fractional inch values together và might be faster than using a calculator.

Inch Fraction Addition Chart

Table showing the sum of common inch fractions. địa chỉ a fraction from the đứng đầu heading & first column; the sum is where they intersect.+ 1/8″+ 1/4″+ 3/8″+ 1/2″+ 5/8″+ 3/4″+ 7/8″+ 1″1/8″1/4″3/8″1/2″5/8″3/4″7/8″1″
1/4″3/8″1/2″5/8″3/4″7/8″1″1 1/8″
3/8″1/2″5/8″3/4″7/8″1″1 1/8″1 1/4″
1/2″5/8″3/4″7/8″1″1 1/8″1 1/4″1 3/8″
5/8″3/4″7/8″1″1 1/8″1 1/4″1 3/8″1 1/2″
3/4″7/8″1″1 1/8″1 1/4″1 3/8″1 1/2″1 5/8″
7/8″1″1 1/8″1 1/4″1 3/8″1 1/2″1 5/8″1 3/4″
1″1 1/8″1 1/4″1 3/8″1 1/2″1 5/8″1 3/4″1 7/8″
1 1/8″1 1/4″1 3/8″1 1/2″1 5/8″1 3/4″1 7/8″2″

Inch Fraction Subtraction Chart

Table showing the difference of common inch fractions. Subtract a fraction from the top heading from the first column; the difference is where they intersect.− 1/8″− 1/4″− 3/8″− 1/2″− 5/8″− 3/4″− 7/8″− 1″1/8″1/4″3/8″1/2″5/8″3/4″7/8″1″

We’ve covered the basics of adding length measurements, & we hope you’re feeling confident using the steps above. Learn more about how to add feet và inches with our in-depth guide.

How khổng lồ Multiply or Divide Feet & Inches

The steps lớn multiply or divide feet & inches are similar to the steps for adding and subtracting above.

Step One: Convert Feet & Inches to lớn Decimal

The first step in multiplying or dividing is to lớn convert the length measurements lớn a decimal value. If the length measurements are in feet & inches, it might be easiest lớn convert to lớn inches.

Step Two: Multiply or Divide

With the length value converted lớn a decimal, it’s now possible lớn multiply or divide just lượt thích you would with any decimal number. For example, if your inch value is 1.25 and you need lớn multiply by 2, simply multiply using 1.25 × 2 = 2.5.

The following charts make multiplying or dividing fractional inch values much easier.

Inch Fraction Multiplication Chart

Table showing the multiplication of common inch fractions. Multiply the fraction in the first column by the đứng top heading’s value; the result is where they intersect.

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× 2× 3× 4× 5× 6× 7× 81/8″1/4″3/8″1/2″5/8″3/4″7/8″1″
1/2″3/4″1″1 1/4″1 1/2″1 3/4″2″
3/4″1 1/8″1 1/2″1 7/8″2 1/4″2 5/8″3″
1″1 1/2″2″2 1/2″3″3 1/2″4″
1 1/4″1 7/8″2 1/2″3 1/8″3 3/4″4 3/8″5″
1 1/2″2 1/4″3″3 3/4″4 1/2″5 1/4″6″
1 3/4″2 5/8″3 1/2″4 3/8″5 1/4″6 1/8″7″

Inch Fraction Division Chart

Table showing the division of common inch fractions. Divide the fraction in the first column by the đứng đầu heading’s value; the result is where they intersect.÷ 2÷ 3÷ 4÷ 5÷ 6÷ 7÷ 81/4″1/2″3/4″1″

Inch Fraction and Decimal Equivalents