Add or subtract lengths in inches (decimal or fraction), feet, centimeters, and millimeters. Get in equations as with you would certainly write it 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 results 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 could seem complicated, but it’s actually really simple if you monitor a couple of simple steps. It’s even simpler to include or subtract length measurements utilizing a calculator favor the one above, however follow this easy steps to learn exactly how to carry out it yourself.


Step One: convert Feet and Inches come Decimal

The an initial thing come do once adding, subtraction, or doing various other math through inches, feet, and other measurements is to transform all the measurements into a usual unit the measure.

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

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

You can also use an inch fraction calculator come quickly discover the decimal value for an inch fraction.


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet come inches by multiply the variety of feet by 12, due to the fact that there space 12 customs in a foot. Utilizing a feet to inches switch calculator likewise simplifies this step.


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


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

Step Two: include or Subtract the converted Values

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

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

The complying with charts leveling the process of adding and subtracting fractional inch values together and might be faster than making use of a calculator.

Inch portion Addition Chart

Table mirroring the sum of common inch fractions. Add a fraction from the peak 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 fraction Subtraction Chart

Table showing the distinction of usual inch fractions. Subtract a fraction from the peak heading indigenous the very first column; the distinction 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 we hope you’re emotion confident utilizing the measures above. Learn an ext about exactly how to include feet and inches in our in-depth guide.

How to main point or divide Feet & Inches

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

Step One: convert Feet and also Inches come Decimal

The first step in multiplying or splitting is to convert the length measurements to a decimal value. If the size measurements are in feet and also inches, it can be easiest to transform to inches.

Step Two: main point or Divide

With the size value convert to a decimal, it’s now possible to main point or divide as with you would with any kind of decimal number. Because that example, if your inch value is 1.25 and also you need to multiply by 2, simply multiply making use of 1.25 × 2 = 2.5.

The adhering to charts do multiplying or separating fractional inch values lot easier.

Inch portion Multiplication Chart

Table mirroring the multiplication of usual inch fractions. Multiply the portion in the an initial column through the optimal heading’s value; the result 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 department Chart

Table mirroring the division of usual inch fractions. Division the portion in the first column by 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