How to convert screw sizes

Written by alexander poirier
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How to convert screw sizes
Screw sizes are given in either metric or imperial form, both of which can be converted to the other. (screws and heart shaped screws image by timur1970 from Fotolia.com)

Screw sizes are measured using both the metric and imperial measurement types. The metric form of measurements gives the screw's gauge (diameter) and the screw's length in millimetres. The imperial method, however, uses inches to measure the screws length and a unit of measurement entirely unique to screws to measure the gauge. With a few simple measurement conversion equations, you can convert between these two forms of measurement to ensure you are using the proper screws for your project.

Skill level:
Moderate

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Things you need

  • Calculator

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Instructions

  1. 1

    Insert the length of the screw in millimetres into the calculator.

  2. 2

    Multiply the number by 0.03937 to determine the length of the screw in inches.

  3. 3

    Insert the gauge of the screw in millimetres into the calculator.

  4. 4

    Multiply the number by 0.03937 to determine the gauge of the screw in inches.

  5. 5

    Subtract 0.06 from the gauge of the screw in inches.

  6. 6

    Divide the new number by 0.013. The result is the imperial measurement of the screw's gauge.

  7. 7

    Write the screw size in the following format: (imperial screw gauge size) x (screw length in inches).

  1. 1

    Insert the length of the screw in inches into the calculator. Remember that the imperial screw measurement format is (gauge of screw) x (length of screw).

  2. 2

    Multiply the number by 25.4 to convert the inches to millimetres.

  3. 3

    Insert the screw's gauge number into the calculator.

  4. 4

    Multiply the number by 0.013. Add 0.06 to this new value to determine the gauge of the screw in inches.

  5. 5

    Multiply the gauge of the screw in inches by 25.4 to convert the inches into millimetres. Write the screw size in the following format: (screw gauge in millimetres) | (screw length in millimetres).

Tips and warnings

  • Alternately, you can refer to a metric/imperial size conversion chart to check the size of your screw.

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