Use the same unit when comparing length notes. An inch is 2.54 centimetres; converting the number does not change how the product was measured.
Apply the conversion
Multiply inches by 2.54 to obtain centimetres. Divide centimetres by 2.54 to obtain inches. For example, 16 inches converts to 40.64 centimetres, and 20 inches to 50.8 centimetres. These are mathematical conversions, not statements that a particular styled wig will fall at that point on every wearer.
Keep the catalogue choice intact
If a listing offers 16 inches, record that selected option alongside the conversion rather than replacing it with a rounded label. Check the seller’s measurement method separately. A converted number cannot explain whether a photograph is styled, which strand was measured or how the hair will look after a haircut.
Practical check
- Keep original unit and converted value.
- Record rounding explicitly.
- Use the product’s measurement guidance for selection.
Sources and relevant products
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