Add or subtract lengths in inches (decimal or fraction), feet, centimeters, and also millimeters. Get in equations just like 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 also 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 inches might seem complicated, yet it’s in reality really basic if you monitor a few simple steps. It’s even simpler to include or subtract size measurements utilizing a calculator favor the one above, yet follow this easy steps to learn how to perform it yourself.


Step One: convert Feet and Inches to Decimal

The first thing come do when 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 customs fractions into decimal. Then convert feet, centimeters, and millimeters come inches.

Convert customs fractions come decimal by separating the bottom half of the portion by the bottom half on a calculator. If over there is a whole number, add it to the decimal value after converting.

You can also use an inch portion calculator to quickly find the decimal worth 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 customs in a foot. Using a feet to inches conversion calculator also simplifies this step.


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


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

Step Two: add or Subtract the convert Values

With all measurements in an inch decimal form, add or subtract all dimensions as you usually would, utilizing a calculator together needed. The final result will it is in the length in inches; girlfriend can convert the result to any kind of other unit in ~ this point.

To to express the sum or distinction value in feet, just multiply through 12.

The adhering to charts simplify the process of including and individually fractional inch worths together and also might be much faster than utilizing a calculator.

Inch portion Addition Chart

Table mirroring the amount of typical inch fractions. Add a fraction from the top 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 showing the difference of usual inch fractions. Subtract a fraction from the height heading from the very first 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 spanned the basics of adding length measurements, and also we hope you’re feeling confident using the measures above. Learn more about just how to add feet and inches in our in-depth guide.

How to main point or divide Feet & Inches

The measures to multiply or division feet and also 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 room in feet and 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 main point or divide similar to you would with any kind of decimal number. Because that example, if your inch worth is 1.25 and you have to multiply through 2, merely multiply utilizing 1.25 × 2 = 2.5.

The following charts do multiplying or separating fractional customs values lot easier.

Inch portion Multiplication Chart

Table reflecting the multiplication of typical 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 reflecting the department of usual inch fractions. Divide the portion in the an initial column through the peak heading’s value; the result 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