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Convert inch (US survey) to millimeter

Convert inch (US survey) to millimeter with a verified formula, worked example, conversion table, precision guidance, and reverse conversion.

inch (US survey) to millimeter

millimeter—

Quick answer

1 inch (US survey) = 25.4000508 millimeter.

Formula

millimeter = inch (US survey) × 25.40005080000000000000000000

Precision

The stored factor is used at full decimal precision; round only the displayed result to the precision required by the task.

How to convert inch (US survey) to millimeter

Enter a value in inch (US survey).
Apply a direct multiplication by 25.40005080000000000000000000; no offset or reciprocal step is required.
Round the displayed millimeter value only when needed.

About these units

inch (US survey) is a unit used in length conversions. Length measures distance or linear extent. Its recorded symbol is in. millimeter is a unit used in length conversions. Length measures distance or linear extent. Its recorded symbol is mm.

Explore related conversions

inch (US survey) to millimeter conversion table

inch (US survey)	millimeter
0 inch (US survey)	0e-26 millimeter
1 inch (US survey)	25.4000508000 millimeter
5 inch (US survey)	127.000254000 millimeter
10 inch (US survey)	254.000508000 millimeter
25 inch (US survey)	635.001270000 millimeter
100 inch (US survey)	2540.00508000 millimeter

Frequently asked questions

How do I convert from inch (US survey) to millimeter?

Apply a direct multiplication by 25.40005080000000000000000000; no offset or reciprocal step is required.

What formula does CalculatorHQ use for inch (US survey) to millimeter?

millimeter = inch (US survey) × 25.40005080000000000000000000

How should I round the result?

The stored factor is used at full decimal precision; round only the displayed result to the precision required by the task.

Can I convert millimeter back to inch (US survey)?

Yes. Use the linked reverse conversion, whose formula is validated against this pair with round-trip tests.