Add or subtract lengths in inches (decimal or fraction), feet, centimeters, and millimeters. Enter equations simply favor you would create it on paper, e.g. 4′ 3 7/8″ + 5 cm.

You are watching: 3 and a half inches

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


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How to Add or Subtract Feet & Inches

Adding or subtracting lengths in feet and inches can seem facility, but it’s actually really simple if you follow a couple of easy measures. It’s even easier to add or subtract length measurements using a calculator prefer the one over, but follow these simple measures to learn exactly how to perform it yourself.


Tip One: Convert Feet and also Inches to Decimal

The first thing to carry out as soon as adding, subtractivity, or doing various other math through inches, feet, and other dimensions is to transform all the dimensions into a prevalent unit of measure.

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

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

You have the right to additionally usage an inch fraction calculator to conveniently find 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, since tright here are 12 inches in a foot. Using a feet to inches convariation calculator additionally simplifies this step.


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


Try our various other size convariation calculators to transform various other systems to decimal inches.

Tip Two: Add or Subtract the Converted Values

With all dimensions in an inch decimal form, add or subtract all measurements as you normally would, making use of a calculator as essential. The final outcome will be the size in inches; you deserve to convert the result to any type of various other unit at this point.

To express the amount or difference worth in feet, sindicate multiply by 12.

The following charts simplify the procedure of adding and subtracting fractional inch worths together and could be quicker than utilizing a calculator.

Inch Fractivity Addition Chart

Table reflecting the sum of common inch fractions. Add a portion from the optimal heading and also initially column; the sum 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″
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 prevalent inch fractions. Subtract a portion from the top heading from the first column; the difference is wright here 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 dimensions, and also we hope you’re feeling confident making use of the actions over. Discover even more around how to include feet and also inches in our thorough guide.

How to Multiply or Divide Feet & Inches

The measures to multiply or divide feet and inches are equivalent to the steps for including and subtracting above.

Tip One: Convert Feet and also Inches to Decimal

The initially step in multiplying or dividing is to transform the length dimensions to a decimal value. If the length measurements are in feet and inches, it might be most basic to transform to inches.

Step Two: Multiply or Divide

With the length value converted to a decimal, it’s now feasible to multiply or divide simply choose you would with any decimal number. For example, if your inch value is 1.25 and also you must multiply by 2, sindicate multiply utilizing 1.25 × 2 = 2.5.

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

Inch Fraction Multiplication Chart

Table showing the multiplication of common inch fractions. Multiply the fractivity in the first column by the top 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 Fractivity Division Chart

Table mirroring the division of widespread inch fractions. Divide the fractivity in the initially column by the top heading’s value; the outcome is wright here 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 Fractivity and also Decimal Equivalents


Sometimes a chart provides points easier: find common inch fractions and also indistinguishable decimal worths utilizing this one.