Convert Feet to Inches

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ft
12.0000
in
Formula: Inches = Feet × 12

Common Conversions

Feet (ft)Inches (in)
0.11.2000
0.253.0000
0.56.0000
112.0000
224.0000
336.0000
560.0000
10120.00
15180.00
20240.00
25300.00
50600.00
75900.00
1001200.00
1501800.00
2503000.00
5006000.00
100012000.00
250030000.00
500060000.00

What Is Feet TO Inches?

One foot equals exactly 12 inches. This is perhaps the most frequently used conversion within the imperial system, embedded in everyday life in the US and UK. Height is stated as "5 feet 10 inches" but recorded as a single number (70 inches) for medical and military purposes. Lumber is sold in foot lengths but cross-section dimensions are in inches. Television screen diagonals are in inches, but wall space planning uses feet. Cooking recipes might call for a "foot-long sub" that is 12 inches. Construction workers measure walls in feet but specify trim and molding details in inches. The factor of 12 originates from ancient Roman measurement and has persisted for millennia because 12 offers convenient divisibility by 2, 3, 4, and 6, enabling easy fractional arithmetic without decimals.

Formula

Multiply the foot value by 12 to get inches. This is exact by definition: 1 foot has always been 12 inches. The relationship is fundamental to the imperial system.

Best For:

  • Construction: converting wall and room measurements (feet) to trim dimensions (inches)
  • Health and military: expressing height as total inches from feet and inches
  • Retail: translating product dimensions between feet and inches for packaging
  • Cooking and food service: standard sub sandwich and pizza sizes
  • Lumber: converting board lengths in feet to inches for cutting plans

How to Feet TO Inches

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Frequently Asked Questions

Exactly 12 inches.
The 12-based system comes from Roman measurement. Twelve is favored because it divides evenly by 2, 3, 4, and 6, making fractions simpler.
66 inches. Multiply 5.5 by 12.
Multiply feet by 12 and add the remaining inches. Example: 5'9" = (5 x 12) + 9 = 69 inches.