Add or subtract lengths in customs (decimal or fraction), feet, centimeters, and also millimeters. Go into equations similar to you would certainly write the on paper, e.g. 4′ 3 7/8″ + 5 cm.

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See the results in inches, feet, centimeters, and millimeters – all results 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 might seem complicated, however it’s in reality really simple if you monitor a few simple steps. That even less complicated to add or subtract size measurements utilizing a calculator choose the one above, however follow these easy procedures to learn exactly how to carry out it yourself.


Step One: convert Feet and Inches to Decimal

The first thing to do once adding, subtraction, or doing other math with inches, feet, and also other dimensions is to convert all the measurements right into a typical unit that measure.

Start by converting inch fractions into decimal. Then transform feet, centimeters, and millimeters come inches.

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

You can likewise use one inch portion calculator to quickly find the decimal value 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 space 12 inches in a foot. Making use of a feet come inches conversion calculator likewise simplifies this step.


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


Try ours other length conversion calculators to transform other systems to decimal inches.

Step Two: add or Subtract the converted Values

With all measurements in an inch decimal form, include or subtract all dimensions as you typically would, using a calculator as needed. The final result will be the length in inches; you can transform the result to any type of other unit in ~ this point.

To express the amount or difference value in feet, merely multiply through 12.

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

Inch portion Addition Chart

Table mirroring the sum of common inch fractions. Include a portion from the height 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 reflecting the difference of typical inch fractions. Subtract a portion from the optimal heading from 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 spanned the basics of adding length measurements, and also we hope you’re emotion confident using the measures above. Learn much more about just how to include feet and also inches in our comprehensive guide.

How to multiply or divide Feet & Inches

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

Step One: convert Feet and Inches to Decimal

The very first step in multiply or separating is to convert the size measurements to a decimal value. If the size measurements room in feet and also inches, it could be easiest to transform to inches.

Step Two: multiply or Divide

With the size value convert to a decimal, the now possible to main point or divide similar to you would with any kind of decimal number. Because that example, if your inch value is 1.25 and you need to multiply through 2, merely multiply using 1.25 × 2 = 2.5.

The complying with charts make multiplying or splitting fractional customs values much easier.

Inch portion Multiplication Chart

Table mirroring the multiplication of common inch fractions. Main point the portion in the first column by the optimal heading’s value; the an outcome is whereby 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 department Chart

Table reflecting the department of typical inch fractions. Division the fraction in the very first column through the optimal heading’s value; the an outcome is wherein 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 makes things easier: find typical inch fractions and equivalent decimal values making use of this one.