Add or subtract lengths in inch (decimal or fraction), feet, centimeters, and millimeters. Enter 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 also metric.


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How to add or Subtract Feet & Inches

Adding or subtracting lengths in feet and also inches can seem complicated, but it’s actually really basic if you monitor a couple of 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 actions to learn just how to execute it yourself.


Step One: convert Feet and Inches come Decimal

The first thing come do as soon as adding, subtraction, or doing other math through inches, feet, and other measurements is to convert all the measurements into a usual unit that measure.

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

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

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


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet come inches by multiply the number of feet by 12, because there are 12 inches in a foot. Making use of a feet to inches conversion calculator also simplifies this step.


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


Try ours other size conversion calculators to convert other units to decimal inches.

Step Two: add or Subtract the converted Values

With all measurements in an inch decimal form, add or subtract all measurements as you typically would, using a calculator together needed. The final result will be the size in inches; girlfriend can transform the result to any other unit at this point.

To refer the sum or distinction value in feet, just multiply by 12.

The following charts leveling the procedure of including and individually fractional inch values together and also might be much faster than utilizing a calculator.

Inch portion Addition Chart

Table showing the sum of usual inch fractions. Include a portion from the height heading and first column; the amount 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 reflecting the distinction of usual inch fractions. Subtract a fraction from the optimal heading native the 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 actions above. Learn much more about just how to include feet and also inches in our in-depth guide.

How to multiply or divide Feet & Inches

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

Step One: convert Feet and Inches come Decimal

The very first step in multiply or splitting is to convert the length measurements come a decimal value. If the size measurements space in feet and also inches, it can be most basic 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 as with you would with any decimal number. For example, if her inch value is 1.25 and you have to multiply through 2, merely multiply making use of 1.25 × 2 = 2.5.

The following charts do multiplying or separating fractional inch values much easier.

Inch portion Multiplication Chart

Table showing the multiplication of usual inch fractions. Main point the portion in the an initial column through the top heading’s value; the result is wherein 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 mirroring the division of usual inch fractions. Division the fraction in the very first column by the peak heading’s value; the result 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