Inches Calculator
Add or subtract multiple inch measurements including decimals, with automatic conversion to fractional inches, feet, and centimetres.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
Result
20.7500 in
Fraction: 20 3/4 in · Feet: 1.7292 ft · cm: 52.7050
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the Inches Calculator
The inches calculator adds or subtracts a list of inch measurements and shows the total as decimal inches, the nearest fraction down to 1/64 in, feet and centimetres. It is built for workshop use, where measurements are often a mix of whole inches and fractions and adding them by hand invites mistakes.
How to use it
- 1Choose whether to add or subtract.
- 2Enter each inch value in its own field; add more fields as needed.
- 3Read the total as a fraction, in feet and in centimetres.
- 4Copy, share or print the result with the buttons below it.
Worked example
12 + 5.5 + 3.25 inches = 20.75 inches, which is 20 3/4 in, 1 ft 8 3/4 in or 52.71 cm.
How it works
How it works
Enter as many inch values as needed. The calculator totals them and converts to the nearest 64th-inch fraction, feet, and centimetres.
Fraction conversion algorithm
The decimal part is compared against fractions with denominators up to 64 (½, ¼, ⅛, 1/16, 1/32, 1/64). The best matching fraction within 0.0001 tolerance is returned.
Common use cases
- Adding cut lengths in woodworking
- Totalling trim or moulding measurements
- Converting a total length to centimetres
Frequently asked questions
A:Enter the decimal equivalent: 1/4 inch = 0.25, 3/8 = 0.375, 5/16 = 0.3125.
A:The output rounds to the nearest 64th of an inch, which is 0.015625 inches.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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