Enter a measurement
Formula used
Total inches = (Feet × 12) + Inches + Numerator ÷ Denominator
Decimal yards = Total inches ÷ 36
Meters = Total inches × 0.0254
Centimeters = Total inches × 2.54
Millimeters = Total inches × 25.4
How to use this calculator
- Select the required conversion direction.
- Enter feet, inches, and an optional fraction.
- Choose decimal precision and rounding preferences.
- Select the nearest fractional-inch increment.
- Press Calculate to view every converted measurement.
- Copy, print, or export the result when needed.
For text input, use a format like 5' 7 1/2". The calculator accepts common unit words and quotation symbols.
Worked examples
| Feet | Inches | Fraction | Decimal feet | Total inches |
|---|---|---|---|---|
| 5 | 6 | 0 | 5.5000 | 66 |
| 6 | 3 | 1/2 | 6.2917 | 75.5 |
| 7 | 10 | 3/4 | 7.8958 | 94.75 |
| 4 | 15 | 1/4 | 5.2708 | 63.25 |
Common fractional-inch decimals
| Fraction | Decimal inch | Decimal foot |
|---|---|---|
| 1/2 | 0.5000 | 0.041667 |
| 1/4 | 0.2500 | 0.020833 |
| 3/4 | 0.7500 | 0.062500 |
| 1/8 | 0.1250 | 0.010417 |
| 3/8 | 0.3750 | 0.031250 |
| 5/8 | 0.6250 | 0.052083 |
| 7/8 | 0.8750 | 0.072917 |
| 1/16 | 0.0625 | 0.005208 |
| 3/16 | 0.1875 | 0.015625 |
| 5/16 | 0.3125 | 0.026042 |
| 7/16 | 0.4375 | 0.036458 |
| 9/16 | 0.5625 | 0.046875 |
| 11/16 | 0.6875 | 0.057292 |
| 13/16 | 0.8125 | 0.067708 |
| 15/16 | 0.9375 | 0.078125 |
About feet, inches, and decimal measurements
Feet and inches remain common in construction, woodworking, architecture, surveying, and property measurement. Decimal feet are often easier for calculations, spreadsheets, estimates, and computer-aided design. This calculator connects both formats without removing familiar fractional measurements.
A measurement combines twelve inches for every foot. Fractional inches add another portion of one inch. The calculator first converts everything into total inches for consistent processing.
Decimal feet are found by dividing total inches by twelve. Metric results use exact international conversion factors. One inch equals exactly 2.54 centimeters under the international definition.
Rounding matters when materials have practical cutting limits. A carpenter may round to the nearest sixteenth inch. A surveyor may keep several decimal places for precise field records.
The reverse mode helps when software exports decimal feet. It converts decimal or metric values into normalized feet, inches, and fractions. This makes technical values easier to read on plans.
Negative measurements are useful for offsets, coordinates, and differences. The sign applies to the entire entered measurement. The result keeps that direction across every displayed unit.
Text parsing supports entries containing apostrophes, quotation marks, and unit words. Structured fields remain helpful when accuracy and validation are priorities. Both methods produce the same conversion workflow.
Improper inches can appear during calculations or imported records. The calculator normalizes them into additional feet in its main result. It also preserves the source description for auditing.
Use the rounding difference to evaluate measurement impact. A small difference may be acceptable for rough work. Precision-sensitive projects should follow approved drawings and professional tolerances.
Exported records help document estimates, classroom work, and project measurements. The CSV file is suitable for spreadsheet tools. The PDF option creates a compact report for sharing.
Frequently asked questions
How do I convert feet and inches into decimal feet?
Multiply feet by twelve, add inches and fractions, then divide the total inches by twelve.
What is 5 feet 6 inches in decimal feet?
Five feet six inches equals 5.5 decimal feet because six inches is half of one foot.
Can I enter fractional inches?
Yes. Enter a numerator and denominator or select a common fraction from the list.
Does the calculator simplify fractions?
Yes. Entered fractions are simplified before the measurement is processed and displayed.
What happens when inches exceed twelve?
The normalized result carries each group of twelve inches into an additional foot.
Can it convert decimal feet back to feet and inches?
Yes. Select reverse conversion and enter the decimal feet value.
Which fractional rounding options are available?
You can round to whole, half, quarter, eighth, sixteenth, thirty-second, or sixty-fourth inches.
Can I use comma decimals?
Yes. The calculator accepts either commas or periods as decimal separators in numeric fields.
Are negative measurements supported?
Yes. Select the negative sign or include a minus sign in text input.
How accurate are metric conversions?
They use the exact relationship of one inch equaling 25.4 millimeters.
Can I export my result?
Yes. Use the CSV, PDF, print, or copy controls shown with calculated results.