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

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


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How to include or Subtract Feet & Inches

Adding or subtracting lengths in feet and inches could seem complicated, however it’s actually really simple if you follow a couple of simple steps. It’s even easier to add or subtract length measurements making use of a calculator favor the one above, yet follow these easy measures to learn exactly how to carry out it yourself.


Step One: transform Feet and Inches come Decimal

The an initial thing to do as soon as adding, subtraction, or doing various other math through inches, feet, and also other measurements is to transform all the measurements into a common unit that measure.

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

Convert inch fractions to decimal by dividing the bottom fifty percent of the fraction by the bottom fifty percent on a calculator. If over there is a totality number, add it to the decimal worth after converting.

You can additionally use an inch fraction calculator to quickly uncover the decimal value for an inch fraction.


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet to inches by multiplying the number of feet by 12, due to the fact that there are 12 inch in a foot. Using a feet come inches switch calculator likewise simplifies this step.


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


Try our other length conversion calculators to convert other systems to decimal inches.

Step Two: include or Subtract the convert Values

With all measurements in an customs decimal form, include or subtract all dimensions as you normally would, using a calculator as needed. The final result will be the length in inches; girlfriend can convert the result to any other unit at this point.

To express the amount or difference value in feet, merely multiply by 12.

The following charts simplify the procedure of including and individually fractional inch values together and also might be much faster than utilizing a calculator.

Inch fraction Addition Chart

Table mirroring the sum of common inch fractions. Include a portion from the height heading and an initial 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 reflecting the distinction of usual inch fractions. Subtract a portion from the top heading from the first column; the distinction 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″
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 extended the basics of adding length measurements, and we expect you’re feeling confident utilizing the procedures above. Learn much more about exactly how to include feet and inches in our detailed guide.

How to main point or divide Feet & Inches

The actions to main point or divide feet and also inches are comparable to the measures for adding and individually above.

Step One: convert Feet and also Inches come Decimal

The first step in multiplying or splitting is to convert the size measurements come a decimal value. If the length measurements are in feet and inches, it could be most basic to convert to inches.

Step Two: main point or Divide

With the length value convert to a decimal, it’s now possible to main point or divide as with you would with any kind of decimal number. For example, if her inch value is 1.25 and you need to multiply through 2, merely multiply using 1.25 × 2 = 2.5.

The adhering to charts do multiplying or dividing fractional inch values lot easier.

Inch portion Multiplication Chart

Table reflecting the multiplication of usual inch fractions. Multiply the fraction in the first column through the height heading’s value; the an outcome is whereby 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″
1/4″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 mirroring the division of common inch fractions. Divide the fraction in the an initial column by the optimal heading’s value; the result is wherein they intersect.÷ 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 portion and Decimal Equivalents