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

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


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How to add or Subtract Feet & Inches

Adding or subtracting lengths in feet and inches can seem complicated, yet it’s actually really basic if you follow a few simple steps. The even simpler to include or subtract length measurements using a calculator choose the one above, yet follow this easy measures to learn just how to do it yourself.


Step One: transform Feet and Inches come Decimal

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

Start through converting customs fractions into decimal. Then transform feet, centimeters, and millimeters to inches.

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

You can also use one inch portion calculator come quickly discover the decimal value 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. Making use of a feet come inches conversion calculator likewise simplifies this step.


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


Try our other size conversion calculators to convert other units to decimal inches.

Step Two: include or Subtract the converted Values

With all dimensions in an inch decimal form, add or subtract all dimensions as you usually would, making use of a calculator as needed. The final an outcome will it is in the length in inches; girlfriend can convert the result to any kind of other unit in ~ this point.

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

The following charts simplify the process of adding and individually fractional inch worths together and might be faster than using a calculator.

Inch fraction Addition Chart

Table mirroring the amount of typical inch fractions. Add a portion from the top heading and very 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 portion Subtraction Chart

Table reflecting the difference of common inch fractions. Subtract a portion from the top heading indigenous the very first column; the distinction 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 covered the basics of adding length measurements, and also we hope you’re emotion confident utilizing the measures above. Learn more about just how to add feet and also inches in our thorough guide.

How to multiply or division Feet & Inches

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

Step One: transform Feet and also Inches to Decimal

The very first step in multiplying or dividing is to convert the length measurements come a decimal value. If the size measurements are in feet and also inches, it might be most basic to transform to inches.

Step Two: main point or Divide

With the size value converted to a decimal, the now possible to main point or divide just like you would certainly with any type of decimal number. For example, if your inch worth is 1.25 and you have to multiply by 2, merely multiply utilizing 1.25 × 2 = 2.5.

The complying with charts do multiplying or dividing fractional customs values lot easier.

Inch portion Multiplication Chart

Table reflecting the multiplication of common inch fractions. Multiply the fraction in the an initial column by the top heading’s value; the an outcome 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 height heading’s value; the an outcome 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 provides things easier: find usual inch fractions and also equivalent decimal values utilizing this one.