Feet and Inches Calculator

Combine feet and inches into decimal feet, total inches, and meters for accurate length calculations.

Calculate feet and inches
Enter both parts of an imperial measurement to convert the complete length.

About the feet and inches calculator

A feet and inches calculator combines the two parts of an imperial length and expresses the measurement in forms that are easier to use in formulas. Construction drawings, height records, furniture dimensions, and home-improvement plans often write a length as separate feet and inches. Many calculations, however, need one decimal value or one consistent unit. This tool returns decimal feet, total inches, and meters from the same input. The calculation begins with the exact relationship of 12 inches per foot. Multiply the feet value by 12 and add the separate inches value to obtain total inches. Divide that total by 12 to obtain decimal feet. To produce meters, multiply total inches by exactly 0.0254, because the international inch is defined as 25.4 millimeters. These fixed factors make the conversion deterministic and suitable for everyday technical work. For example, 5 feet 6 inches contains 66 total inches. Dividing 66 by 12 gives 5.5 decimal feet, and multiplying 66 by 0.0254 gives 1.6764 meters. The calculator also accepts an inch value of 12 or more. Entering 0 feet and 12 inches correctly produces 1 decimal foot, so measurements do not need to be normalized before entry. Decimal feet should not be confused with a feet-and-inches reading. The digits after a decimal point represent tenths or hundredths of a foot, not inches. A value of 5.5 feet therefore means 5 feet 6 inches, not 5 feet 5 inches. Converting through total inches avoids that frequent mistake and makes addition, area calculations, and material estimates more reliable. Use as much input precision as the original measurement supports. Fractional inches can be entered as decimals, such as 6.5 inches, when a tape measurement includes a half inch. The displayed values are rounded only to keep the result readable. This calculator is useful for recording height, checking room dimensions, translating architectural measurements, preparing cut lists, and converting an imperial specification for metric equipment. For area or volume, convert each required linear dimension first and then apply the appropriate squared or cubed units.

Feet and inches examples

These examples show how mixed imperial measurements become single-unit values.

Feet and inchesConverted valuesUse
5 ft 6 in5.5 ft; 66 in; 1.6764 mHeight conversion
8 ft 0 in8 ft; 96 in; 2.4384 mStandard board length
0 ft 12 in1 ft; 12 in; 0.3048 mAutomatic normalization
3 ft 9 in3.75 ft; 45 in; 1.143 mFurniture dimension

How to calculate feet and inches

  1. Enter the whole or decimal number of feet.
  2. Enter the remaining inches, including a decimal fraction if needed.
  3. Select Calculate length.
  4. Read the decimal-feet, total-inches, and meter results.

Feet and inches calculator FAQ

How do I convert feet and inches to decimal feet?

Divide the inches by 12 and add that amount to the feet. For example, 6 inches is 0.5 foot, so 5 feet 6 inches equals 5.5 feet.

How do I find total inches?

Multiply the feet by 12 and add the remaining inches. Five feet six inches therefore contains 66 total inches.

Can the inches value be greater than 11?

Yes, the calculator accepts any nonnegative inch value and combines it correctly. Twelve inches adds exactly one decimal foot to the result.

Can I enter fractional inches?

Yes, enter a fractional measurement as a decimal, such as 6.5 for six and one-half inches. The result preserves practical precision while removing unnecessary trailing zeros.

How are inches converted to meters?

Total inches are multiplied by the exact factor 0.0254. This factor follows the international definition of the inch and gives a dependable metric result.