Add or subtract lengths in inch (decimal or fraction), feet, centimeters, and also millimeters. Enter equations similar to you would certainly 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 outcomes 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 might seem complicated, however it’s actually really simple if you follow a couple of simple steps. It’s even easier to include or subtract size measurements making use of a calculator prefer the one above, but follow this easy steps to learn just how to carry out it yourself.


Step One: convert Feet and also Inches to Decimal

The first thing come do once adding, subtraction, or doing other math through inches, feet, and also other dimensions is to convert all the measurements into a typical unit the measure.

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

Convert inch fractions come decimal by separating the bottom half of the portion by the bottom half on a calculator. If there is a entirety number, include it to the decimal worth after converting.

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


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet to inches by multiply the variety of feet by 12, because there space 12 inch in a foot. Making use of a feet to inches counter calculator likewise simplifies this step.


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


Try our other size conversion calculators to transform other units to decimal inches.

Step Two: add or Subtract the converted Values

With all measurements in an customs decimal form, include or subtract all measurements as you normally would, utilizing a calculator as needed. The final result will it is in the size in inches; friend can transform the an outcome to any kind of other unit in ~ this point.

To refer the amount or difference value in feet, simply multiply through 12.

The complying with charts leveling the process of including and individually fractional inch worths together and also might be faster than using a calculator.

Inch fraction Addition Chart

Table showing the amount of usual inch fractions. Include a portion from the height heading and an initial column; the sum is whereby 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 difference of common inch fractions. Subtract a fraction from the height heading indigenous the first column; the difference is whereby 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 including length measurements, and we expect you’re emotion confident using the steps above. Learn an ext about exactly how to include feet and also inches in our in-depth guide.

How to multiply or divide Feet & Inches

The actions to multiply or division feet and also inches are comparable to the procedures for adding and subtracting above.

Step One: transform Feet and Inches to Decimal

The first step in multiply or dividing is to transform the size measurements to a decimal value. If the length measurements room in feet and also inches, it could be most basic to convert to inches.

Step Two: main point or Divide

With the length value converted to a decimal, it’s now possible to multiply or divide similar to you would with any kind of decimal number. Because that example, if her inch worth is 1.25 and you have to multiply by 2, simply multiply utilizing 1.25 × 2 = 2.5.

The following charts make 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 an initial column by the height 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 mirroring the division of usual inch fractions. Divide the portion in the very first column by the top 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 portion and Decimal Equivalents