How many centimeters are in 1 inch?

1 inch equals exactly 2.54 centimeters (0.0254 meters). That exact definition is used for inch conversions.

How do inches convert to feet and yards?

There are 12 inches in 1 foot and 36 inches in 1 yard. So ft = in/12 and yd = in/36.

What is the difference between international foot and survey foot?

International foot is exactly 0.3048 m. U.S. survey foot is 1200/3937 m (about 0.3048006096 m) and appears in older surveying and mapping.

Length Conversion

Inches Converter (in)

Convert inches to feet, yards, miles, metric units, survey units, and astronomical distance units. Enter a value in inches, pick the target unit, and get instant results with a clear conversion formula.

1 in = 0.0254 m (exact) 1 ft = 12 in 1 yd = 36 in 1 mi = 63,360 in 1 hand = 4 in 1 fathom = 72 in

What is an inch?

The inch (in) is a US customary and imperial length unit. It is defined exactly as 0.0254 meters, which makes inch-to-metric conversions precise.

Why include survey units?

U.S. survey feet appear in older land records, plats, and mapping workflows. If you see “ftUS” in documents, use Survey Feet here.

Astronomy scale

Light years, AU, and parsecs are extremely large. Converting inches to these units often produces very small values, shown in scientific notation.

Inches to Anything Converter

Choose your target unit, enter inches, then copy the result. Use Swap to invert the conversion quickly.

How this conversion works

Inches → meters → target unit

This page uses the meter (m) as the base unit. First it converts inches to meters, then meters to your selected unit.

Base unit: meter (m)

Plain language

Inches are used for small measurements like screens, bolts, woodworking, and DIY projects. Metric units like mm and cm are common in manufacturing and global standards.

Common formulas

m = in × 0.0254
ft = in ÷ 12
yd = in ÷ 36
mi = in ÷ 63,360

Real world uses

Construction, machining, product dimensions, screen sizes, tools, fasteners, and engineering drawings.

From Unit

To Unit

Value

Tip: You can type commas (like 10,000). The converter reads it as 10000.

Result

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Enter a value to convert

Conversion Formula

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Notes: Very large units (light years, AU, parsecs) will display using scientific notation for readability.

Conversion Charts & Visual Guides

Visual reference charts for quick conversions and comparisons.

Imperial to Metric Quick Reference

Inches	Centimeters	Millimeters
1 in	2.54 cm	25.4 mm
5 in	12.7 cm	127 mm
10 in	25.4 cm	254 mm
12 in (1 ft)	30.48 cm	304.8 mm
36 in (1 yd)	91.44 cm	914.4 mm
100 in	254 cm	2540 mm

Common Conversions at a Glance

1 inch = 2.54 cm

1 foot (12 in) = 0.3048 m

1 yard (36 in) = 0.9144 m

1 mile (63,360 in) = 1.60934 km

1 hand (4 in) = 10.16 cm

1 fathom (72 in) = 1.8288 m

Understanding Inch Conversions

Deep dive into inch conversions, historical context, and practical applications.

History of the Inch

The inch has ancient origins, originally defined as the width of a thumb. Modern standardization fixed it at exactly 0.0254 meters in 1959 through international agreement, making it compatible with metric conversions.

Imperial vs. Metric Systems

The imperial system (inches, feet, yards) is primarily used in the United States, while the metric system (centimeters, meters, kilometers) is the international standard. Understanding both is essential for global trade and engineering.

Survey vs. International Units

U.S. survey feet (1200/3937 m) differ slightly from international feet (0.3048 m). This distinction matters in land surveying, mapping, and historical property records. Always check which standard applies to your documents.

Practical Applications & Use Cases

Where and why inch conversions matter in real-world scenarios.

🏗️ Construction & Carpentry

Carpenters, builders, and architects frequently work with inches for framing, measurements, and blueprints. Converting to metric helps when sourcing materials internationally or working with metric tools.

⚙️ Manufacturing & Engineering

Precision machining, product design, and engineering drawings often specify dimensions in inches. Converting to millimeters is critical for CNC machines and international suppliers.

📱 Consumer Electronics

Screen sizes (TVs, monitors, phones) are commonly listed in inches. Understanding metric equivalents helps with international specifications and packaging dimensions.

🌍 International Trade

Global commerce requires converting between imperial and metric units. Accurate conversions prevent costly mistakes in shipping, customs, and international contracts.

🔧 Fasteners & Hardware

Bolts, screws, and nuts are sized in inches in North America. Converting to metric helps when selecting compatible fasteners from international suppliers.

📐 Surveying & Land Records

Historical land surveys use survey feet and chains. Modern GIS systems and international property transactions require converting these legacy measurements to metric standards.

Worked Examples

Quick examples help visitors verify conversions.

Example: Inches to centimeters

Convert 10 in to cm.

Result: —

Example: Inches to feet

Convert 72 in to ft.

Result: —

Example: Inches to miles

Convert 100,000 in to mi.

Result: —

FAQ

Is 1 inch exactly 2.54 cm?

Yes. The inch is defined as exactly 0.0254 meters, which equals exactly 2.54 centimeters.

What is a “hand” in inches?

A hand is a traditional unit used for horse height. 1 hand = 4 inches.

Why is pace marked “approx”?

A pace is not a single universal standard. This converter uses a common approximation of 1 pace ≈ 2.5 ft.