2,856
ft
26
in
110
in
26
ft
26
m
68
in
42
in
2,856
ft
26
in
110
in
26
ft
26
m
68
in
42
in
The Feet and Inches Calculator performs arithmetic operations — addition, subtraction, multiplication, and division — with measurements in feet and inches. This is essential for construction, carpentry, interior design, and any project requiring imperial length calculations.
Working with feet and inches can be challenging because it's a mixed-radix system (12 inches per foot). Adding 5'8" + 3'9" isn't as simple as adding decimal numbers — the inches carry over to feet when they exceed 12. Our calculator handles all the carrying and borrowing automatically.
Results are provided in feet and inches, total inches, and meters, giving you flexibility for different applications — from cutting lumber to specifying measurements on international drawings.
All values are first converted to total inches: total = feet × 12 + inches. The selected operation is performed on the inch values. For multiplication, the result is divided by 12 to maintain correct units. The final result is converted back to feet and inches.
When the result is negative (subtraction), the feet value shows the negative sign. Always verify that inches in results are between 0 and 11.99 — this indicates proper carrying.
Inputs
Results
5'8" + 3'6" = 9'2"
Inputs
Results
10'0" - 3'7" = 6'5"
Add the feet together and inches together. If total inches ≥ 12, carry over: subtract 12 from inches and add 1 to feet. Example: 5'9" + 3'6" = 8'15" = 9'3".
If the inches to subtract are larger, borrow 1 foot (12 inches). Example: 8'3" - 2'7" → borrow: 7'15" - 2'7" = 5'8".
Yes, but note that multiplying two length measurements gives area (square feet/inches), while multiplying length by a number gives length.
Divide the inches by 12 and add to feet. Example: 5'6" = 5 + 6/12 = 5.5 feet.
There are exactly 12 inches in 1 foot.
5'11" = 71 inches = 71 × 0.0254 = 1.8034 meters.
The whole number is feet. Multiply the decimal by 12 to get inches. Example: 7.25 ft = 7 ft 3 in.
The duodecimal (base-12) system dates to ancient civilizations. 12 is highly divisible (by 2, 3, 4, 6), making it practical for dividing lengths into halves, thirds, and quarters.
Yes, you can enter decimal inches (e.g., 3.5 for 3½ inches) or use the step buttons for 1/8-inch increments.
Construction typically uses feet-inches-sixteenths (e.g., 8'3-5/16"). Our calculator helps with the math for cutting lists, material estimates, and layout dimensions.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
How helpful was this calculator?
5.0/5 (1 rating)
Length Converter (General)
Length & Distance Converters
Inches to Centimeters Converter
Length & Distance Converters
Centimeters to Inches Converter
Length & Distance Converters
Millimeters to Inches Converter
Length & Distance Converters
Inches to Millimeters Converter
Length & Distance Converters
Kilometers to Miles Converter
Length & Distance Converters
