Add or subtract lengths in customs (decimal or fraction), feet, centimeters, and also millimeters. Go into equations as with you would write that 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 metric.


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How to add or Subtract Feet & Inches

Adding or individually lengths in feet and inches could seem complicated, yet it’s in reality really straightforward if you follow a couple of simple steps. The even much easier to include or subtract size measurements utilizing a calculator like the one above, but follow this easy measures to learn how to carry out it yourself.


Step One: transform Feet and also Inches to Decimal

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

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

Convert inch fractions come decimal by splitting the bottom half of the fraction by the bottom fifty percent on a calculator. If there is a whole number, include it come the decimal worth after converting.

You can likewise use one inch fraction calculator to quickly discover the decimal worth for an inch fraction.


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet come inches by multiplying the variety of feet by 12, since there space 12 customs in a foot. Utilizing a feet to inches conversion calculator additionally 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: include or Subtract the convert Values

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

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

The adhering to charts simplify the procedure of including and individually fractional inch values together and also might be quicker than making use of a calculator.

Inch portion Addition Chart

Table mirroring the sum of typical inch fractions. Add a portion from the top heading and an initial 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 showing the difference of common inch fractions. Subtract a fraction from the top heading indigenous the an initial column; the difference 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 measures above. Learn much more about just how to include feet and inches in our detailed guide.

How to main point or divide Feet & Inches

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

Step One: transform Feet and Inches come Decimal

The very first step in multiplying or separating is to convert the size measurements come a decimal value. If the length measurements room in feet and also inches, it might be easiest to convert to inches.

Step Two: multiply or Divide

With the size value convert to a decimal, the now feasible to multiply or divide similar to you would certainly with any type of decimal number. For example, if her inch value is 1.25 and also you need to multiply through 2, simply multiply utilizing 1.25 × 2 = 2.5.

The following charts make multiplying or splitting fractional customs values lot easier.

Inch portion Multiplication Chart

Table showing the multiplication of common inch fractions. Main point the portion in the first column by the peak 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 department Chart

Table showing the division of common inch fractions. Division the portion in the very first column through the height 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 portion and Decimal Equivalents


Sometimes a chart makes things easier: find usual inch fractions and equivalent decimal values making use of this one.