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

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See the outcomes in inches, feet, centimeters, and millimeters – all outcomes are in royal and metric.


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How to Add or Subtract Feet & Inches

Adding or subtracting lengths in feet and inches might seem complex, but it’s actually really simple if you follow a couple of straightforward actions. It’s even much easier to include or subtract length dimensions using a calculator choose the one over, yet follow these basic procedures to learn how to do it yourself.


Step One: Convert Feet and Inches to Decimal

The initially point to execute when including, subtractivity, or doing various other math with inches, feet, and also other measurements is to convert all the dimensions right into a widespread unit of measure.

Start by converting inch fractions right into decimal. Then convert feet, centimeters, and also millimeters to inches.

Convert inch fractions to decimal by separating the bottom half of the fraction by the bottom half on a calculator. If tbelow is a entirety number, include it to the decimal value after converting.

You deserve to also usage an inch fraction calculator to conveniently find the decimal worth for an inch fraction.


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet to inches by multiplying the variety of feet by 12, since tright here are 12 inches in a foot. Using a feet to inches convariation calculator additionally simplifies this step.


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


Try our various other length conversion calculators to convert other units to decimal inches.

Tip Two: Add or Subtract the Converted Values

With all measurements in an inch decimal form, include or subtract all measurements as you generally would, using a calculator as required. The final result will certainly be the length in inches; you deserve to transform the outcome to any kind of various other unit at this point.

To expush the sum or difference worth in feet, sindicate multiply by 12.

The following charts simplify the procedure of adding and also subtracting fractional inch values together and can be faster than making use of a calculator.

Inch Fraction Addition Chart

Table mirroring the amount of widespread inch fractions. Add a fraction from the optimal heading and also initially column; the amount is wbelow 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 Subtractivity Chart

Table mirroring the distinction of common inch fractions. Subtract a portion from the height heading from the initially column; the difference is wright here 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″
0″-1/8″-1/4″-3/8″-1/2″-5/8″-3/4″-7/8″
1/8″0″-1/8″-1/4″-3/8″-1/2″-5/8″-3/4″
1/4″1/8″0″-1/8″-1/4″-3/8″-1/2″-5/8″
3/8″1/4″1/8″0″-1/8″-1/4″-3/8″-1/2″
1/2″3/8″1/4″1/8″0″-1/8″-1/4″-3/8″
5/8″1/2″3/8″1/4″1/8″0″-1/8″-1/4″
3/4″5/8″1/2″3/8″1/4″1/8″0″-1/8″
7/8″3/4″5/8″1/2″3/8″1/4″1/8″0″

We’ve covered the basics of including size dimensions, and also we hope you’re feeling confident utilizing the steps over. Learn more around exactly how to add feet and inches in our in-depth overview.

How to Multiply or Divide Feet & Inches

The steps to multiply or divide feet and also inches are similar to the procedures for including and subtracting over.

Tip One: Convert Feet and Inches to Decimal

The initially step in multiplying or splitting is to convert the length dimensions to a decimal worth. If the length measurements are in feet and also inches, it could be most basic to transform to inches.

Step Two: Multiply or Divide

With the length value converted to a decimal, it’s now feasible to multiply or divide simply favor you would with any type of decimal number. For example, if your inch worth is 1.25 and also you have to multiply by 2, simply multiply utilizing 1.25 × 2 = 2.5.

The following charts make multiplying or dividing fractional inch worths a lot simpler.

Inch Fractivity Multiplication Chart

Table mirroring the multiplication of prevalent inch fractions. Multiply the fractivity in the first column by the peak heading’s value; the outcome is wright here they intersect.× 2× 3× 4× 5× 6× 7× 81/8″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″
1/2″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″
2″3″4″5″6″7″8″

Inch Fraction Division Chart

Table showing the division of common inch fractions. Divide the fraction in the first column by the top heading’s value; the result is wright here they intersect.

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÷ 2÷ 3÷ 4÷ 5÷ 6÷ 7÷ 81/4″1/2″3/4″1″
1/8″5/64″1/16″3/64″1/32″1/32″1/64″
1/4″11/64″1/8″7/64″5/64″1/16″1/16″
3/8″1/4″3/16″5/32″1/8″7/64″3/32″
1/2″21/64″1/4″13/64″11/64″9/64″1/8″

Inch Fraction and Decimal Equivalents


Sometimes a chart provides points easier: uncover common inch fractions and also indistinguishable decimal worths using this one.