Inches to Feet Converter
Convert total inches to decimal feet, decimal feet to total inches, or a feet-plus-inches measurement to total inches. The converter uses the exact relationship 12 inches = 1 foot, preserves fractions internally, and separates exact values from rounded displays.
- Exact rational arithmetic
- Three practical input modes
- Decimal or significant-figure rounding
- Decimal feet and feet-inch output
Convert Inches and Feet
Enter a signed decimal, scientific-notation value, simple fraction or mixed number. Use the separate feet-and-inches mode for measurements such as 5 ft 7 1/2 in.
24 in converted with the exact 12-inches-per-foot relationship.
Calculation Steps
- Use 1 foot = 12 inches exactly.
- Divide 24 inches by 12 to obtain exactly 2 feet.
- Apply the selected six-place display only after conversion.
- Round total inches independently to the selected 1/16-inch increment.
The unit relationship is exact. Decimal and fractional display settings do not add accuracy to the original measurement.
The browser blocked automatic copying. The complete result is selected. Press Ctrl+C on Windows or Command+C on macOS.
How to Use This Inches to Feet Converter
Allow about two minutes for one conversion, including a quick check of the direction and reporting precision.
- Select the mode. Choose total inches to feet, decimal feet to inches, or feet plus inches to total inches.
- Enter the length. Use a decimal, scientific notation, simple fraction or mixed number. In feet-plus-inches mode, enter whole feet and a remaining inch value below 12.
- Choose display precision. Select decimal places or significant figures, enter the required count, and choose a tie rule.
- Select a fractional-inch increment. Choose 1/2 through 1/128 inch for the normalized feet-and-inches and mixed-inch displays.
- Press Convert. Review the rounded answer, exact target value, decimal feet, total inches, feet-plus-inches form and calculation steps.
- Copy, swap or reset. Copy the complete result, swap to the reverse simple direction without using a rounded value, or restore the default 24-inch example.
Zero is valid in both precision modes. In significant-figures mode, trailing zeros show the requested display precision. Positive values suit ordinary dimensions. A negative entry represents a signed coordinate, offset, elevation or displacement difference, not a negative physical size. In feet-plus-inches mode, place the one overall minus sign on the feet field.
How to Convert Inches to Feet
One international foot contains exactly 12 international inches. To convert total inches to decimal feet, divide by 12. The exact reciprocal is 1/12, so most whole-inch values produce a repeating decimal number of feet.
For example, 10 inches equals exactly 5/6 foot. Its decimal expansion is 0.833333..., so a finite decimal such as 0.833333 ft is rounded even though the unit relationship remains exact.
How to convert feet to inches
Reverse the direction by multiplying decimal feet by exactly 12. Because 12 is a whole number, entered terminating decimals often produce terminating inch results.
To combine feet and inches, multiply the whole-foot magnitude by 12 and add the remaining inches. For 5 ft 7 1/2 in, the calculation is 5 × 12 + 7 1/2 = 67 1/2 in. The converter applies one overall sign after combining a negative feet-plus-inches entry.
Inches and Feet Conversion Examples
Example 1: Convert 1 inch to feet
Divide 1 by 12. The exact result is 1/12 ft, or approximately 0.0833333333333 ft. Rounded to six decimal places, the displayed value is approximately 0.083333 ft.
Example 2: Convert 30 inches to feet
Thirty divided by 12 equals exactly 2.5 ft. The same length is 2 ft 6 in because the decimal part, 0.5 ft, multiplied by 12 equals 6 in.
Example 3: Convert 5.75 feet to inches
Multiply 5.75 by 12 to obtain exactly 69 in. The decimal part 0.75 ft represents 9 in, so the normalized form is 5 ft 9 in.
Example 4: Convert 5 ft 7 1/2 in to total inches
Multiply 5 ft by 12, then add 7 1/2 in. The exact result is 67 1/2 in, which equals 5.625 ft. No decimal approximation is required for this example.
Inches to Feet Conversion Table
Repeating decimal-foot values are rounded to six places. The feet-plus-inches column remains exact for every whole-inch entry shown.
| Total inches | Decimal feet | Feet and inches |
|---|---|---|
| 1 in | 0.083333 ft | 0 ft 1 in |
| 6 in | 0.5 ft | 0 ft 6 in |
| 12 in | 1 ft | 1 ft 0 in |
| 18 in | 1.5 ft | 1 ft 6 in |
| 24 in | 2 ft | 2 ft 0 in |
| 30 in | 2.5 ft | 2 ft 6 in |
| 36 in | 3 ft | 3 ft 0 in |
| 48 in | 4 ft | 4 ft 0 in |
| 60 in | 5 ft | 5 ft 0 in |
| 66 in | 5.5 ft | 5 ft 6 in |
| 72 in | 6 ft | 6 ft 0 in |
| 96 in | 8 ft | 8 ft 0 in |
Decimal Feet, Total Inches and Feet Plus Inches
Decimal feet treat the entire length as one base-10 value. Feet-plus-inches notation separates the whole-foot count from the remaining inches. For example, 5.5 ft and 5 ft 6 in describe the same length. To change only the decimal part of feet into inches, multiply that part by 12.
Total inches are useful for formulas, product dimensions and comparisons. Feet-plus-inches notation is common in height, construction and tape-measure work. The converter gives both forms from one exact total-inch value, so they remain consistent after carrying across a 12-inch boundary.
The selected fractional-inch increment affects only the mixed-inch and feet-plus-inches displays. Options range from 1/2 through 1/128 inch. If 11.99 in rounds to 12 in at the chosen increment, the normalized companion result becomes 1 ft 0 in, not 0 ft 12 in.
A fractional display is labelled exact only when the total lands on the selected increment. Otherwise it is a separate approximation. For negative values, one minus sign applies to the whole length. The page writes negative compound values as -(5 ft 7 1/2 in) to avoid treating only the foot component as negative.
Exact Conversion, Rounding and Measurement Precision
The conversion factor adds no uncertainty because one foot contains exactly 12 inches. That does not make every entered measurement exact. A ruler reading, body measurement, product dimension or construction result may have limited resolution, tolerance and uncertainty.
Separate four ideas:
- Exact factor: 1 ft = 12 in by definition.
- Exact mathematical result: the entered decimal multiplied by the exact rational factor.
- Displayed decimal: the exact result rounded to the selected decimal places or significant figures.
- Measured result: a report limited by the original measurement, tolerance and required method.
The default tie rule is round-to-nearest, ties-to-even. In an exact halfway case, the retained final digit becomes even. The alternate ties-away rule moves a halfway magnitude away from zero. The result panel states the selected precision and shows the absolute change caused by final rounding.
Common Inches and Feet Conversion Mistakes
- Using the factor in the wrong direction. Divide inches by 12 to get feet. Multiply feet by 12 to get inches.
- Treating decimal feet as base 12. In 5.5 ft, the .5 means half a foot, or 6 in. It does not mean 5 in.
- Rounding before the final step. Shortening the factor or an intermediate answer can change the reported result.
- Allowing 12 remaining inches. Normalize 4 ft 12 in as 5 ft 0 in.
- Applying a minus sign to only one component. Treat a negative compound measurement as one signed length.
- Dropping the unit. A bare number does not show whether the result is total inches, decimal feet or feet plus inches.
- Creating false precision. A long decimal conversion does not prove that the original dimension was measured that finely.
- Applying a linear factor to area or volume. One square foot equals 144 square inches, and one cubic foot equals 1,728 cubic inches.
Inches vs Feet
The inch and foot are non-SI units used in US customary and imperial measurement contexts. The formal symbols are in and ft. A foot is the larger unit and contains exactly 12 inches. The international foot also equals exactly 0.3048 metre, while the international inch equals exactly 0.0254 metre.
Inches often suit small product dimensions, screens, tools, furniture details and parts. Feet often suit room dimensions, building work, human height and longer everyday distances. Decimal feet work well in formulas and data tables. Feet-plus-inches notation often reads more naturally on plans and tape measures.
This converter uses the ordinary international foot. It does not substitute the historical U.S. survey foot used in some legacy geospatial records. It also converts linear length only. Square and cubic units require squared or cubed factors.
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Frequently Asked Questions
How many inches are in 1 foot?
There are exactly 12 inches in 1 international foot. The relationship is defined, so the conversion factor itself is not approximate.
What is the formula for converting inches to feet?
Divide total inches by 12. For example, 42 inches divided by 12 equals exactly 3.5 feet, or 3 ft 6 in.
How do I convert feet to inches?
Multiply decimal feet by 12. For example, 4.25 feet multiplied by 12 equals exactly 51 inches.
How many feet is 30 inches?
Thirty inches equals exactly 2.5 feet. In feet-plus-inches notation, the same length is 2 ft 6 in.
How many total inches is 5 ft 7 in?
Five feet equals 60 inches. Add 7 inches to get exactly 67 total inches.
What is the difference between decimal feet and feet plus inches?
Decimal feet use a base-10 fraction of a foot. Feet plus inches use a whole-foot count and a remaining inch value. For example, 5.5 ft equals 5 ft 6 in.
How do I convert 5.75 feet to feet and inches?
Keep the 5 whole feet and multiply the decimal part, 0.75, by 12. The result is 9 inches, so 5.75 ft equals 5 ft 9 in.
Does the converter accept inch fractions?
Yes. It accepts simple fractions such as 1/2 and mixed numbers such as 7 1/2. The calculator parses them as exact rational values.
How are negative feet-and-inches values handled?
One minus sign applies to the whole compound length. Enter it in the feet field. For a negative value under one foot, use -0 feet and a positive remaining-inch value.
Can I use the same formula for square or cubic units?
No. One square foot equals 12² = 144 square inches. One cubic foot equals 12³ = 1,728 cubic inches. Area and volume need squared or cubed factors.
Calculation Method and Review Basis
The 12-inches-per-foot relationship and formal unit symbols were checked against NIST Handbook 44 Appendix C. The exact metric definitions were checked against NIST length guidance, NIST Special Publication 811 Appendix B.9, and the original 1959 Federal Register notice. The default decimal tie method is nearest, ties to even. Nearest, ties away from zero is available as an alternate reporting convention.
Measurement disclaimer: This converter applies the exact international-foot relationship to typed values. Rounded decimal and fractional displays do not determine instrument accuracy, measurement uncertainty, construction tolerance or legal-metrology compliance. Confirm the required unit, precision, tolerance and calibrated measurement method for safety, trade, engineering or regulated work.