Inch Calculator – Convert Inches to Any Unit
Free, fast, and precise inch calculators for simple length conversions and specialty measurement tools. 100% free, no limits.
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Type in your measurement. Our calculators accept decimals, fractions, and mixed numbers. No unit confusion — just clear labeled fields.
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Inch Conversion Reference Tables
Common Inch Conversions
Inches — Fraction to Decimal
Inch Calculator – Convert Inches to Any Length Unit
The Inch Calculator is a free online tool that converts inches to centimeters, millimeters, feet, meters, yards, and other units of length in one step. Enter any value in inches or in any supported unit and the calculator returns precise results based on the international standard of 1 inch = 25.4 millimeters. It also handles fractional inches (1/2, 1/4, 1/8, 1/16, 1/32) and converts them to decimal inches for use in engineering, construction, and design.
What Is an Inch?
An inch is a unit of length equal to exactly 1/12 of a foot and 1/36 of a yard. Under the International Yard and Pound Agreement of 1959, one inch is defined as exactly 25.4 millimeters, making it a precise, globally recognized measurement. The word "inch" comes from the Latin uncia, meaning "one-twelfth," which reflects its original relationship to the foot. It belongs to both the British Imperial system and the United States customary system and is written as "in" or with the double prime mark (″).
Where Inch Measurements Are Used
Inches are the standard length unit in the United States and are used alongside the metric system in the United Kingdom and Canada. The unit is the global default in specific industries, including television and monitor screen sizes (measured diagonally), tire and wheel sizing, plumbing pipe diameters, lumber and plywood dimensions, paper formats like US Letter (8.5 × 11 inches), and printing resolution measured in DPI (dots per inch) and PPI (pixels per inch).
Built for Accuracy & Speed
All Inch Calculators are designed, coded, and developed individually and put each one through strict, comprehensive testing by our experts.
100% Accurate
All formulas are verified against international standards (ISO, NIST). Our inch-to-metric conversions use the exact 25.4mm definition.
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144+ Calculators
The most comprehensive inch calculator resource on the web — from simple length conversions to specialty engineering tools.
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FAQ
Frequently Asked Questions
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Browse All 144+ CalculatorsQHow many millimeters are in an inch?
How many millimeters are in an inch?
There are exactly 25.4 millimeters in one inch. This is the internationally agreed definition set by the 1959 International Yard and Pound Agreement and is used in engineering, manufacturing, and scientific work. Use the Inches to MM Calculator for quick conversions.
QHow many centimeters are in an inch?
How many centimeters are in an inch?
One inch equals exactly 2.54 centimeters. The conversion is exact, not an approximation, so it works for both everyday measurement and precision applications. For instant results, use the Inches to CM Calculator.
QHow many inches are in a meter?
How many inches are in a meter?
One meter equals 39.3701 inches. Since the inch is defined as exactly 0.0254 meters, the meter contains 1 / 0.0254 = 39.3701 inches. Convert any value with the Inches to Meters Calculator.
QHow do I convert inches to feet?
How do I convert inches to feet?
Divide the number of inches by 12, since 1 foot contains exactly 12 inches. For example, 36 inches ÷ 12 = 3 feet. Use the Inches to Feet Calculator for mixed and decimal results.
QWhat is a fractional inch?
What is a fractional inch?
A fractional inch expresses a measurement as a fraction such as 1/2, 1/4, 1/8, 1/16, or 1/32. This format is standard in woodworking, construction, and metal fabrication, where rulers and tape measures are marked in fractions of an inch. Convert between formats with the Fraction to Decimal Inches Calculator.
QHow do I convert decimal inches to fractions?
How do I convert decimal inches to fractions?
Choose a denominator (for example 16 for sixteenths), multiply the decimal value by it, and round to the nearest whole number. Example: 0.75 × 16 = 12, so 0.75 inch equals 12/16, which simplifies to 3/4 inch. The Decimal to Fraction Inches Calculator does this automatically.
QWhat is 1 inch in pixels?
What is 1 inch in pixels?
It depends on the DPI (dots per inch). At 96 DPI, the standard for web display, 1 inch equals 96 pixels. At 300 DPI, used for print, 1 inch equals 300 pixels. Use the Pixels to Inches Calculator or DPI Calculator for custom values.
QWhat is the difference between square inches and cubic inches?
What is the difference between square inches and cubic inches?
A square inch (in²) measures area: the surface of a 1-inch by 1-inch square. A cubic inch (in³) measures volume: the space inside a 1-inch by 1-inch by 1-inch cube. A linear inch measures length along one dimension. See the Square Inches and Cubic Inches calculators for each.