Inches Converter
Convert inches to any unit of length — or any unit back to inches. Pick a converter below to get started.
InchToMetrics is a free length-unit converter built for the everyday questions people search for: how many centimeters is a TV diagonal, how tall is 175 cm in feet, how wide is a US Letter sheet in millimeters. Every conversion uses the exact internationally defined factors — the same ones published by NIST and BIPM — so the math is reliable for shopping, construction, schoolwork, or engineering reference alike. There is no signup, no ads in the calculator, and no waiting for a page to load — values update as you type.
Inches → Other Units
Other Units → Inches
About Length Unit Conversions
The world uses two main length systems side-by-side. The metric system (centimeters, meters, kilometers) is the global default, taught in schools and used in almost every country for science, manufacturing, and everyday life. The imperial system (inches, feet, yards, miles) remains in everyday use in the United States and the United Kingdom for road signs, body heights, and many traditional industries. Conversions between the two come up constantly — when shopping internationally, reading technical specs, following a recipe, watching sports, or planning travel.
Inside each system, conversions are pure base-10 (cm to m to km) or simple integer ratios (12 inches to a foot, 3 feet to a yard). The bridge between systems uses a few exact, internationally defined factors — most notably 1 inch = 25.4 millimeters, fixed in 1959 — which means there is never any ambiguity or rounding error baked into the math itself.
How to Use This Converter
- Pick the conversion you need from the cards above (or use the search bar in your browser).
- Type any value into the input field — the result updates instantly as you type.
- Read the formula and worked examples below the calculator to understand the math.
- Browse the full conversion table for nearby values, or click a "Common Conversions" link to open a dedicated page for that value.
Frequently Asked Questions
Are the conversions on InchToMetrics exact?
Yes. All conversions use the internationally defined factors — 1 inch = 25.4 mm exactly, 1 foot = 0.3048 m exactly, 1 yard = 0.9144 m exactly. Any rounding you see in the result comes from how many decimal places are displayed, not from the conversion itself.
What is the difference between inches, feet, and yards?
They are all imperial length units with a fixed ratio: 1 foot = 12 inches, 1 yard = 3 feet = 36 inches. Inches are used for small measurements (screen sizes, paper widths), feet for room and building dimensions, and yards for fabric, US football fields, and landscaping.
How accurate is this calculator on a phone?
Calculations run in your browser using IEEE 754 double-precision arithmetic — the same precision used by spreadsheets and scientific software. Results are accurate to roughly 15–17 significant decimal digits, far more than any everyday measurement requires.
Can I bookmark a specific value, like 5 inches to centimeters?
Yes. Each popular value has its own dedicated page (for example, /5-inches-to-centimeters/) that you can bookmark, share, or open offline once cached. The browser back button always returns you to the converter you started from.