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

You are watching: 5 and a half inches

See the outcomes in inches, feet, centimeters, and millimeters – all outcomes are in imperial and also metric.


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How to include or Subtract Feet & Inches

Adding or subtracting lengths in feet and inches might seem complicated, but it’s actually really simple if you monitor a few simple steps. It’s even easier to add or subtract size measurements making use of a calculator like the one above, however follow these easy steps to learn just how to execute it yourself.


Step One: transform Feet and Inches to Decimal

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

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

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

You can additionally use an inch portion calculator come quickly find the decimal value for an inch fraction.


For example:3/8 = 3 ÷ 8 = .375 inches


Convert feet to inches by multiplying the variety of feet by 12, because there room 12 inches in a foot. Using a feet come inches switch calculator additionally 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: add or Subtract the converted Values

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

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

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

Inch fraction Addition Chart

Table mirroring the sum of common inch fractions. Include a fraction from the top heading and very 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 portion Subtraction Chart

Table mirroring the distinction of typical inch fractions. Subtract a portion from the top heading indigenous the very first column; the difference 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″
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 including length measurements, and also we hope you’re feeling confident utilizing the actions above. Learn much more about just how to include feet and also inches in our thorough guide.

How to multiply or division Feet & Inches

The actions to multiply or division feet and also inches are comparable to the steps for adding and subtracting above.

Step One: convert Feet and also Inches come Decimal

The an initial step in multiplying or dividing is to transform the length measurements to a decimal value. If the length measurements are in feet and also inches, it can be most basic to convert to inches.

Step Two: main point or Divide

With the length value converted to a decimal, the now possible to main point or divide just like you would with any kind of decimal number. For example, if her inch worth is 1.25 and also you must multiply through 2, merely multiply using 1.25 × 2 = 2.5.

The complying with charts make multiplying or splitting fractional inch values lot easier.

Inch fraction Multiplication Chart

Table mirroring the multiplication of usual inch fractions. Main point the portion in the very first column by the top heading’s value; the result is wherein 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 usual inch fractions. Division the fraction in the an initial column through the peak 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 renders things easier: find usual inch fractions and also equivalent decimal values using this one.