Inches to Centimeters (in to cm) Converter

Inches to Centimeters

The inch-to-centimeter conversion is one of the most frequently needed. Whether you are buying a TV, checking product dimensions, or comparing measurements across countries, switching between these units is essential.

One inch equals exactly 2.54 cm — not an approximation but the exact definition agreed internationally in 1959, so every result is mathematically accurate.

Why It Matters

Screen Sizes

TVs, monitors, and phones are measured in inches (32", 55", 65") — convert to cm to picture the real size.

Online Shopping

US products often list dimensions in inches while you think in centimetres.

DIY & Body Measurements

Work with tools, materials, and clothing sizes across both systems.

How to Use This Converter

Enter inches

Type your value in the top field. The cm result appears instantly below.

Read centimetres

The figure updates as you type — try different values without pressing anything.

Copy or swap

Copy either value, or tap the swap button to convert cm back to inches.

Conversion Formula

cm = inches × 2.54 • Reverse: inches = cm ÷ 2.54. Example: 10 in × 2.54 = 25.4 cm.

Quick mental math: multiply inches by 2.5 for a fast estimate (10 in ≈ 25 cm, exact 25.4 cm) — within about 2%.

Features

Instant As-You-Type Results

The result updates the moment you enter a number — no button to press, no page reload.

One-Click Swap

The swap button between the two fields reverses the direction instantly, so you can convert back without retyping.

Copy Without the Unit

Each field has its own copy button that grabs only the number, ready to paste into forms, spreadsheets, or documents.

Searchable Unit Picker

Each dropdown has a search box — switch to any other length unit and use it as a general-purpose converter.

Popular Screen Sizes

TV & Monitors

55" = 139.7 cm, 65" = 165.1 cm measured diagonally corner to corner. The reference table lists more sizes.

Tools & Products

Many imported tools and gadgets list inches; convert to cm to match metric specs at home.

Everything runs locally. Values never leave your device, nothing is tracked, and the converter works offline once the page has loaded.

Frequently Asked Questions

How many cm is 1 inch?

1 inch equals exactly 2.54 centimetres — the international definition of the inch since 1959.

How do I convert inches to cm manually?

Multiply the number of inches by 2.54. For example, 10 inches × 2.54 = 25.4 cm.

Why are TV screens measured in inches?

Screen sizes are measured diagonally in inches because the US television industry set the standard and it became the global convention. A "55-inch TV" has a 55-inch diagonal (139.7 cm).

What's the difference between an inch and a cm?

The inch is an imperial unit used mainly in the US (and partly the UK and Canada). The centimetre is a metric unit used by most of the world; the metric system's powers of ten make calculations simpler.

Is 2.54 cm per inch exact?

Yes. Since 1959 the inch has been defined as exactly 25.4 mm (2.54 cm) — not an approximation or a rounded figure.

How accurate is this converter?

It uses the exact 2.54 factor and JavaScript floating-point precision (about 15–17 significant digits), showing results up to 8 decimal places.

Inches to Centimeters