Change feet and inches into one unit.
⚙️Calculation Parameters
📊Calculated Output
How Feet-and-Inches Converter Works?
To normalize tube dimensions, the Feet-and-Inches Converter turns any mix of feet, inches and fractions into decimal feet, decimal inches, centimeters (cm) and meters (m). The process takes 4 steps.
Enter the reading
Type a tape reading such as 3 ft 7-1/2 in, 43.5 in or 3.625 ft.
Parse fractions
The converter reads fractions like 1/2, 1/4, 1/8 and 1/16.
Convert
The tool converts the reading to total inches, then to every other unit.
Copy the value
Copy the decimal value into a volume calculator that needs one unit.
Feet-and-Inches Converter Formula
The Feet-and-Inches Converter uses exact length factors.
Total inches
in = ft × 12 + in + numerator ÷ denominatorCombines all parts.
Decimal feet
ft = in ÷ 1212 in per foot.
Metric
cm = in × 2.54 and m = in × 0.0254Exact since 1959.
Worked example: 3 ft 7-1/2 in
- in = 3 × 12 + 7 + 1 ÷ 2 = 43.5 in
- ft = 43.5 ÷ 12 = 3.625 ft
- 43.5 in = 110.49 cm = 1.1049 m
Feet-and-Inches Converter Conversion Table
The feet-and-inches conversion table lists 9 common tube lengths and diameters in 5 formats.
| Inches | Feet + inches | Decimal feet | Centimeters | Meters |
|---|---|---|---|---|
| 6 in | 0 ft 6 in | 0.5000 ft | 15.24 cm | 0.1524 m |
| 10 in | 0 ft 10 in | 0.8333 ft | 25.40 cm | 0.2540 m |
| 18 in | 1 ft 6 in | 1.5000 ft | 45.72 cm | 0.4572 m |
| 30 in | 2 ft 6 in | 2.5000 ft | 76.20 cm | 0.7620 m |
| 42 in | 3 ft 6 in | 3.5000 ft | 106.68 cm | 1.0668 m |
| 48 in | 4 ft 0 in | 4.0000 ft | 121.92 cm | 1.2192 m |
| 54 in | 4 ft 6 in | 4.5000 ft | 137.16 cm | 1.3716 m |
| 66 in | 5 ft 6 in | 5.5000 ft | 167.64 cm | 1.6764 m |
| 100 in | 8 ft 4 in | 8.3333 ft | 254.00 cm | 2.5400 m |
Volume formulas need one consistent unit. Convert every length before calculating.
What is Feet-and-Inches Converter?
A Feet-and-Inches Converter is a length tool that normalizes tube dimensions between feet-and-inches, decimal feet, decimal inches and metric units.
Tape measures read feet, inches and fractions. Calculators need one decimal number. Mixing them is the most common source of volume errors, such as entering 3.6 for 3 ft 6 in when the decimal is 3.5. The converter removes that error before any volume math.
The tool accepts tape-style input and returns the format each calculator needs.
What are the uses of Feet-and-Inches Converter?
There are 4 main uses of the Feet-and-Inches Converter.
Tape readings
Crews convert field readings to decimals.
Cut lists
Installers convert decimal plans into tape marks.
Metric conversion
Builders convert imperial sizes for metric suppliers.
Spreadsheet input
Estimators enter clean decimal values.
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