How to Convert Inches to Centimeters (With Reference Chart)

Inches to centimeters is one of the simplest conversions mathematically, but it's also one of the most frequently needed — screen sizes, clothing measurements, furniture dimensions, and height are all commonly listed in one unit when you're used to the other, and getting it wrong when buying something online can mean returning an item that simply doesn't fit the space it was meant for.

The inches-to-centimeters formula

This is an exact conversion, not a rounded approximation — the inch has been formally defined as exactly 2.54 centimeters since an international agreement in 1959. That makes it one of the few unit conversions with zero rounding error at the definition level, which is part of why it's used as the reference conversion when explaining how metric and imperial length units relate to each other.

Reference chart for common measurements

• 1 inch = 2.54 cm
• 6 inches = 15.24 cm
• 12 inches (1 foot) = 30.48 cm
• 24 inches (a typical monitor) = 60.96 cm
• 55 inches (a mid-size TV) = 139.7 cm
• 65 inches (a large TV) = 165.1 cm

For height specifically, a quick way to sanity-check a conversion: 5 feet (60 inches) is about 152.4 cm, and each additional inch adds 2.54 cm from there — so 5'6" works out to roughly 167.6 cm, and 6'0" to roughly 182.9 cm.

Where this conversion comes up most

Screen sizes (TVs, monitors, phones) are measured diagonally in inches almost everywhere in the world, even in countries that are otherwise fully metric, which is why this is one conversion most people end up needing regardless of where they live. It's equally common in clothing and shoe sizing, furniture dimensions on international shopping sites, and comparing height or body measurements between countries that report figures differently.

It's also worth double-checking whether a listed dimension is a single measurement (like screen size, which is diagonal) or a full set of dimensions (like furniture width, depth, and height) before converting — mixing those up is a common source of ordering mistakes on international sites.

A related mix-up: paper and document sizes

Anyone who has printed a document formatted for the wrong region has run into this: most of the world uses the ISO A-series for paper, with A4 (21 × 29.7 cm, or 8.27 × 11.69 inches) as the standard letter-size sheet, while the US, Canada, and a few other countries use "Letter" size (8.5 × 11 inches, or 21.59 × 27.94 cm) instead. The two sizes are close enough to look identical at a glance but different enough that a document formatted for one will have its margins subtly cut off or shifted when printed on the other, which is a common source of formatting headaches for anyone regularly exchanging files internationally.