Add or subtract lengths in inch (decimal or fraction), feet, centimeters, and millimeters. Get in equations similar to 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 outcomes are in imperial and also metric.


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How to add or Subtract Feet & Inches

Adding or individually lengths in feet and also inches might seem complicated, but it’s actually really easy if you follow a few simple steps. It’s even easier to add or subtract size measurements utilizing a calculator prefer the one above, but follow this easy procedures to learn just how to execute it yourself.


Step One: convert Feet and Inches to Decimal

The an initial thing come do as soon as adding, subtraction, or doing various other math with inches, feet, and other dimensions is to convert all the measurements right into a usual unit of measure.

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

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

You can additionally use an inch portion calculator come quickly uncover the decimal worth for an customs fraction.


For example:3/8 = 3 ÷ 8 = .375 inches


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


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


Try ours other length conversion calculators to transform other systems to decimal inches.

Step Two: include or Subtract the convert Values

With all dimensions in an inch decimal form, include or subtract all dimensions as you generally would, using a calculator as needed. The final result will be the size in inches; friend can transform the an outcome to any kind of other unit in ~ this point.

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

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

Inch portion Addition Chart

Table mirroring the amount 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 portion Subtraction Chart

Table mirroring the difference of common inch fractions. Subtract a fraction from the top heading indigenous the very 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 also we hope you’re emotion confident utilizing the actions above. Learn an ext about how to add feet and inches in our thorough guide.

How to multiply or division Feet & Inches

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

Step One: convert Feet and also Inches come Decimal

The an initial step in multiplying or dividing is to transform the size measurements come a decimal value. If the size measurements are in feet and also inches, it might be simplest to transform to inches.

Step Two: main point or Divide

With the size value convert to a decimal, it’s now feasible to multiply or divide similar to you would certainly with any type of decimal number. Because that example, if your inch value is 1.25 and you should multiply through 2, just multiply using 1.25 × 2 = 2.5.

The complying with charts make multiplying or separating fractional inch values much easier.

Inch portion Multiplication Chart

Table mirroring the multiplication of usual inch fractions. Main point the portion in the an initial column through the optimal 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 division Chart

Table reflecting the department of usual inch fractions. Division the fraction in the very first column through the height heading’s value; the an outcome is whereby 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