Add or subtract lengths in inch (decimal or fraction), feet, centimeters, and also millimeters. Go into equations similar to you would write the 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 outcomes are in imperial and also metric.
How to include or Subtract Feet & Inches
Adding or subtracting lengths in feet and also inches can seem complicated, however it’s in reality really basic if you monitor a few simple steps. It’s even easier to add or subtract size measurements making use of a calculator choose the one above, but follow this easy procedures to learn just how to carry out it yourself.Step One: convert Feet and Inches to Decimal
The very first thing come do once adding, subtraction, or doing various other math v inches, feet, and also other dimensions is to transform all the measurements into a typical unit the measure.
Start through converting inch fractions into decimal. Then transform feet, centimeters, and millimeters to inches.
Convert customs fractions come decimal by dividing the bottom half of the fraction by the bottom half on a calculator. If there is a entirety number, add it come the decimal worth after converting.
You can likewise use an inch portion calculator to quickly find the decimal worth for an customs fraction.
For example:3/8 = 3 ÷ 8 = .375 inches
Convert feet to inches by multiply the number of feet by 12, due to the fact that there space 12 inch 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 length conversion calculators to transform other systems to decimal inches.
Step Two: add or Subtract the convert Values
With all dimensions in an customs decimal form, include or subtract all measurements as you usually would, utilizing a calculator as needed. The final an outcome will it is in the length in inches; you can transform the an outcome to any type of other unit at this point.
To refer the amount or distinction value in feet, simply multiply by 12.
The adhering to charts simplify the procedure of including and subtracting fractional inch values together and might be quicker than making use of a calculator.
Inch fraction Addition Chart
| 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
| 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 also we hope you’re emotion confident utilizing the actions above. Learn much more about how to add feet and inches in our detailed guide.
How to multiply or division Feet & Inches
The measures to main point or divide feet and also inches are comparable to the actions for including and individually above.
Step One: transform Feet and Inches come Decimal
The an initial step in multiply or dividing is to transform the size measurements to a decimal value. If the length measurements space in feet and also inches, it might be simplest to convert to inches.
Step Two: main point or Divide
With the size value convert to a decimal, it’s now possible to multiply or divide just like you would with any decimal number. Because that example, if your inch value is 1.25 and you must multiply through 2, merely multiply utilizing 1.25 × 2 = 2.5.
The complying with charts do multiplying or dividing fractional inch values much easier.
Inch fraction Multiplication Chart
| 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
| 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″ |