Add or subtract lengths in inch (decimal or fraction), feet, centimeters, and millimeters. Get in equations as with 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.


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How to include or Subtract Feet & Inches

Adding or subtracting lengths in feet and also inches can seem complicated, however it’s actually really basic if you monitor a couple of simple steps. It’s even much easier to include or subtract length measurements using a calculator favor the one above, yet follow this easy procedures to learn just how to perform it yourself.


Step One: convert Feet and Inches to Decimal

The first thing to do once adding, subtraction, or doing various other math v inches, feet, and also other measurements is to transform all the measurements into a typical unit that measure.

Start by converting customs fractions right into decimal. Then convert feet, centimeters, and millimeters come inches.

Convert customs fractions to decimal by separating the bottom half of the fraction by the bottom fifty percent on a calculator. If over there is a entirety number, include it to the decimal worth after converting.

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


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet come inches by multiply the variety of feet through 12, due to the fact that there room 12 inch in a foot. Using a feet to inches switch calculator also simplifies this step.


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


Try our other length conversion calculators to transform other devices to decimal inches.

Step Two: add or Subtract the convert Values

With all measurements in an inch decimal form, include or subtract all measurements as you normally would, making use of a calculator as needed. The final an outcome will it is in the size in inches; friend can convert the result to any type of other unit at this point.

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

The adhering to charts simplify the procedure of adding and individually fractional inch values together and also might be quicker than utilizing a calculator.

Inch fraction Addition Chart

Table reflecting the amount of usual inch fractions. Add a portion from the top heading and an initial column; the sum is wherein 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 mirroring the distinction of usual inch fractions. Subtract a portion from the optimal heading native the an initial 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″
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 length measurements, and we hope you’re feeling confident making use of the procedures above. Learn much more about how to include feet and inches in our thorough guide.

How to main point or division Feet & Inches

The steps to main point or divide feet and inches are comparable to the measures for including and individually above.

Step One: transform Feet and also Inches to Decimal

The an initial step in multiply or separating is to convert the length measurements come a decimal value. If the size measurements are in feet and also inches, it could be most basic to convert to inches.

Step Two: main point or Divide

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

The complying with charts make multiplying or dividing fractional customs values much easier.

Inch portion Multiplication Chart

Table mirroring the multiplication of usual inch fractions. Multiply the fraction in the very first column by the top heading’s value; the an outcome 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″
1/4″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 department Chart

Table reflecting the department of common inch fractions. Divide the fraction in the an initial column by the height heading’s value; the an outcome is where 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 fraction and Decimal Equivalents