Feet and Inches Calculator
Our free length & area converter handles feetand inches conversions. See tables, ratios, and examples for quick reference.
Formula
Total Inches = (Feet x 12) + Inches
Convert each measurement to inches, perform the operation, then convert back. One foot equals 12 inches. One inch equals 2.54 centimeters.
Frequently Asked Questions
How do I add feet and inches together?
To add feet and inches, first convert both measurements entirely to inches by multiplying the feet value by 12 and adding the remaining inches. Then add the two totals together. Finally, convert the result back to feet and inches by dividing by 12, where the quotient is feet and the remainder is inches. For example, to add 5 feet 8 inches and 3 feet 6 inches: convert to 68 inches and 42 inches, add to get 110 inches, then divide 110 by 12 to get 9 feet 2 inches. This method ensures accuracy and avoids errors from carrying over inches greater than 12.
How do I convert feet and inches to centimeters?
To convert feet and inches to centimeters, first convert the entire measurement to inches by multiplying feet by 12 and adding the inches portion. Then multiply the total inches by 2.54, since one inch equals exactly 2.54 centimeters. For example, 5 feet 10 inches equals 70 inches total, which converts to 70 x 2.54 = 177.8 centimeters. This conversion is essential when working with international building materials, medical height measurements, or scientific applications that use the metric system rather than imperial units commonly used in the United States.
What is the difference between feet-inches and decimal feet?
Feet-inches notation expresses measurements as whole feet plus remaining inches, such as 5 feet 6 inches. Decimal feet express the same measurement as a single decimal number, such as 5.5 feet, where the decimal portion represents a fraction of a foot rather than inches. To convert feet-inches to decimal feet, divide the inches by 12 and add to the feet: 5 feet 6 inches becomes 5 + 6/12 = 5.5 feet. Conversely, 5.75 decimal feet equals 5 feet 9 inches. Decimal feet are commonly used in surveying and engineering calculations, while feet-inches are standard in construction and everyday measurements.
What formula does Feet and Inches Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Can I use Feet and Inches Calculator on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
Can I share or bookmark my calculation?
You can bookmark the calculator page in your browser. Many calculators also display a shareable result summary you can copy. The page URL stays the same so returning to it will bring you back to the same tool.