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Quickly add, subtract, multiply, or divide feet and inches with this easy-to-use measurement calculator.
Result
11 ft 9.3 in
The imperial system of feet and inches remains a cornerstone in construction, carpentry, interior design, and everyday tasks across the United States and other parts of the world. However, performing accurate arithmetic with imperial units can become tedious, especially when dealing with mixed numbers or fractional values. That's where our Feet and Inches Calculator becomes invaluable. This tool simplifies calculations involving feet and inches—whether you're adding, subtracting, multiplying, or dividing—and saves you from costly mistakes and time-consuming manual work.
Imperial unit calculations differ from metric system operations due to the absence of a base-10 structure. In the imperial system, 1 foot equals 12 inches, so any operation involving these measurements must account for conversion factors. Manual calculations often require converting mixed numbers to a single unit before computing and then converting back to the desired form. While calculators can expedite this process, understanding the manual steps provides deeper insight and accuracy for complex projects.
A common approach is converting all values to one consistent unit—either feet or inches—before performing operations. Afterward, the result can be reconverted into feet and inches as needed. This method simplifies the math and ensures consistency throughout the process.
To add 2 feet 8½ inches and 2 feet 5¾ inches, convert them to inches first:
For example, subtract 3 feet 9½ inches from 5 feet 2¾ inches:
When multiplying 5 feet 2¾ inches by 3 feet 9½ inches, convert to inches:
To divide 5' 2¾" by 3' 9½":
You can also calculate directly in feet and inches without converting. Just perform operations from the smallest unit (inches) to the largest (feet), borrowing or carrying over as needed.
Before standardization, body parts were commonly used for measurement. These units made practical sense in daily life and often varied by person or region.
Roughly ¾ inch, a finger was widely used in ancient civilizations. It was a standard subdivision of the cubit and is still used informally (e.g., a "finger" of whiskey).
Typically 3 inches or 75 mm. The palm was divided into 4 fingers and was used in Egypt, Israel, and medieval Europe.
Standardized at 4 inches and still used today to measure the height of horses. Originated from the width of a human hand.
The cubit is the distance from the elbow to the tip of the middle finger, ranging from 44 to 52 cm historically. Used in ancient Egypt and biblical texts.
A shaftment is 6 inches (half a foot) and was defined by the width of the fist and extended thumb. Common in medieval England.
Now defined as 0.3048 meters, the foot originated from the average length of a human foot. Still widely used in the U.S. and U.K. for height and construction.
Derived from the forearm's length, the ell varied from 27 to 54 inches in Europe. Used for tailoring and textiles. Became obsolete after the Weights and Measures Act of 1824.
Used for measuring water depth, a fathom equals 6 feet. Still common in maritime navigation and fishing industries.
Initially a humorous unit, the smoot was created in 1958 at MIT, defined as the height of Oliver R. Smoot (5'7"). It became an actual measurement on the Harvard Bridge in Boston and remains a novelty unit of length.
Our Feet and Inches Calculator is designed to take the stress out of complex arithmetic involving imperial units. Whether you're doing home renovations, working in architecture, or simply calculating your height, the calculator allows you to:
This tool is an essential companion for contractors, students, engineers, and DIYers alike. Try our Feet and Inches Calculator now and simplify your next measurement task with precision and ease!