⚖️ Comparison · Updated for 2026

Centimetres vs Inches

Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.

Quick answer: 1 inch = 2.54 cm exactly. The factor has been internationally agreed since 1959. Centimetres are SI-standard; inches dominate in the US, UK (for short distances) and aviation worldwide.
Decision guide — when to use which
Use Centimetres when…

All scientific work, most of the world for everyday measurements, screen sizes in some markets.

Use Inches when…

US construction, US sewing, some UK trades, screen sizes (TV/monitor diagonals), pipe and bolt sizes worldwide.

📊 Side-by-side comparison
Aspect Centimetres Inches
Definition SI: 1/100 of a metre Exactly 25.4 mm by international agreement
Symbol cm in or "
Common precision mm (1/10 cm) 1/16 inch or 1/32 inch in trades
Body height Used in most countries UK and US default for personal height

Frequently asked

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Is 1 inch exactly 2.54 cm?

Yes, exactly. Since 1959, the international inch has been defined as 25.4 mm by treaty.

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What's 6 foot in cm?

6 feet = 72 inches = 182.88 cm, universally rounded to 183 cm in clinical records. Common heights: 5'6" = 167.6 cm, 5'8" = 172.7 cm, 5'10" = 177.8 cm, 6'0" = 182.9 cm, 6'2" = 188.0 cm. The UK uses cm for medical records, but feet/inches in everyday conversation.

Reviewed for 2026. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.

Frequently asked questions

Is 1 inch exactly 2.54 cm?

Yes, exactly. Since 1959, the international inch has been defined as 25.4 mm by treaty.

What's 6 foot in cm?

6 feet = 72 inches = 182.88 cm, universally rounded to 183 cm in clinical records. Common heights: 5'6" = 167.6 cm, 5'8" = 172.7 cm, 5'10" = 177.8 cm, 6'0" = 182.9 cm, 6'2" = 188.0 cm. The UK uses cm for medical records, but feet/inches in everyday conversation.