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1 inches to millimeters

Answer

1 inch = 25.4 millimeters

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How to convert inches to millimeters: 1 inch equals 25.4 millimeters. So multiply the number of inches by 25.4 to get millimeters.

millimeters = inches × 25.4

inches to millimeters conversion table

inchesmillimeters
1 inch25.4 millimeters
2 inches50.8 millimeters
3 inches76.2 millimeters
5 inches127 millimeters
10 inches254 millimeters
20 inches508 millimeters
25 inches635 millimeters
50 inches1,270 millimeters
100 inches2,540 millimeters
1000 inches25,400 millimeters

Worked example: 1 inches in millimeters

To convert 1 inches to millimeters by hand, start from the fact that one inch is exactly 25.4 millimeters. Multiply that rate by your figure — 1 × 25.4 = 25.4 millimeters. The relationship also works in reverse: 25.4 millimeters converts straight back to 1 inch, which is handy when you want to double-check a measurement or move between inches and millimeters quickly.

Frequently asked questions

How many millimeters are in 1 inches?
1 inch is equal to 25.4 millimeters.
What is the formula to convert inches to millimeters?
Multiply the number of inches by 25.4. As an equation: millimeters = inches × 25.4.
Is one inch bigger than one millimeter?
Yes — one inch is the larger unit, because it equals 25.4 millimeters.
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