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25.4 mm = 1 in (exactly).
There are 25.4 millimetres in one inch.
25.4mm in 1 inch

Algebraic Steps / Dimensional Analysis Formula 1 in*

2.54 cm

1 in

*

10 mm

1 cm

=

25.4 mm

Direct Conversion Formula 1 in*

25.4 mm

1 in

=

25.4 mm

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8y ago
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8y ago

There are 25.4 mm in 1 inch.

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Q: How many millimetres in one inch?
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There are 25.4 millimetres in one inch. Therefore, three eighths of an inch is equal to 3/8 x 25.4 = 9.525 millimetres.


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There are 25.4 millimetres in one inch. Therefore, 1.579 thousandths of an inch is equal to 1.579/1000 x 25.4 = 0.0401066 millimetres.


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