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

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


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How to include or Subtract Feet & Inches

Adding or individually lengths in feet and inches could seem complicated, however it’s in reality really simple if you follow a few simple steps. It’s even much easier to include or subtract length measurements making use of a calculator choose the one above, but follow this easy steps to learn how to perform it yourself.


Step One: transform Feet and Inches to Decimal

The very first 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 typical unit that measure.

Start by converting customs fractions into decimal. Then transform feet, centimeters, and also millimeters to 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 entirety number, add it to the decimal value after converting.

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


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet come inches by multiply the variety of feet by 12, because there are 12 inch in a foot. Utilizing a feet to inches conversion calculator additionally simplifies this step.


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


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

Step Two: add or Subtract the convert Values

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

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

The complying with charts simplify the procedure of adding and individually fractional inch worths together and also might be faster than utilizing a calculator.

Inch fraction Addition Chart

Table showing the sum of typical inch fractions. Add a fraction from the height heading and first column; the amount 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 portion Subtraction Chart

Table showing the distinction of common inch fractions. Subtract a portion from the height 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 adding length measurements, and we expect you’re emotion confident using the measures above. Learn much more about just how to add feet and also inches in our thorough guide.

How to main point or divide Feet & Inches

The procedures to multiply or divide feet and inches are comparable to the actions for including and subtracting above.

Step One: convert Feet and Inches to Decimal

The very first step in multiply or dividing is to convert the length measurements come a decimal value. If the length measurements space in feet and inches, it might be simplest to convert to inches.

Step Two: multiply or Divide

With the length value converted to a decimal, the now feasible to main point or divide similar to you would certainly with any type of decimal number. Because that example, if her inch value is 1.25 and also you have to multiply by 2, merely multiply using 1.25 × 2 = 2.5.

The following charts do multiplying or dividing fractional customs values much easier.

Inch fraction Multiplication Chart

Table reflecting the multiplication of usual inch fractions. Main point the fraction in the first column by the height heading’s value; the result is where they intersect.× 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 showing the division of common inch fractions. Divide the fraction in the an initial column through the optimal heading’s value; the result is whereby they intersect.

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÷ 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


Sometimes a chart renders things easier: find common inch fractions and also equivalent decimal values using this one.