Add or subtract lengths in inch (decimal or fraction), feet, centimeters, and also millimeters. Enter equations just like 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 individually lengths in feet and inches might seem complicated, however it’s actually really simple if you monitor a couple of simple steps. It’s even much easier to include or subtract length measurements making use of a calculator favor the one above, however follow these easy steps to learn just how to perform it yourself.


Step One: convert Feet and Inches come Decimal

The an initial thing to do as soon as adding, subtraction, or doing various other math through inches, feet, and other dimensions is to transform all the measurements into a typical unit of measure.

Start through converting inch fractions right into decimal. Then transform feet, centimeters, and millimeters to inches.

Convert inch fractions to decimal by dividing the bottom half of the fraction by the bottom fifty percent on a calculator. If over there is a totality 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 to inches by multiplying the number of feet by 12, because there room 12 customs in a foot. Utilizing a feet come inches conversion calculator likewise simplifies this step.


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


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

Step Two: include or Subtract the converted Values

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

To refer the sum or distinction value in feet, merely multiply through 12.

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

Inch portion Addition Chart

Table mirroring the sum of typical inch fractions. Include a portion from the optimal heading and first 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 showing the difference of usual inch fractions. Subtract a fraction from the height heading native the very first column; the distinction 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″
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 adding length measurements, and we expect you’re feeling confident using the procedures above. Learn more about how to include feet and also inches in our thorough guide.

How to multiply or division Feet & Inches

The procedures to multiply or divide feet and also inches are similar to the measures for including and subtracting above.

Step One: convert Feet and Inches come Decimal

The very first step in multiplying or splitting is to convert the size measurements to a decimal value. If the size measurements room in feet and also inches, it can be simplest to convert to inches.

Step Two: multiply or Divide

With the length value converted to a decimal, it’s now possible to main point or divide just like you would certainly with any decimal number. Because that example, if your inch value is 1.25 and also you must multiply by 2, simply multiply using 1.25 × 2 = 2.5.

The complying with charts make multiplying or dividing fractional customs values lot easier.

Inch portion Multiplication Chart

Table showing the multiplication of common inch fractions. Multiply the fraction in the very first column through the peak heading’s value; the an outcome 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 department of usual inch fractions. Divide the portion in the first column through the top 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