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Fractional Inches to Decimal Inches to
Approximate Millimeters to Practical Millimeters

Decimal inches multiplied by 25.4 = approximate mm. N.B. When
specifying metric sheet or trim sizes, fractional approximate mm measurements
must be rounded off to the nearest whole number; i.e., 50.8 mm
is not a practical measurement; it should be rounded up to 51 mm,
and 0.5 mm is always rounded down.
Fractional
Inch
Decimal
Inch
Approximate
Millimeters
Practical
Millimeters
1/160.06251.58752
1/80.12503.17503
3/160.18754.76255
1/40.25006.35006
5/160.31257.93758
3/80.37509.525010
7/160.437511.112511
1/20.500012.700013
9/160.562514.287514
5/80.625015.875016
11/160.687517.462517
3/40.750019.050019
13/160.812520.637521
7/80.875022.225022
15/160.937523.812524
1.0 1.025.425

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Millimeters to Decimal Inches to Approximate
Fractional Inches to Practical Fractional Inches

Millimeters divided by 25.4 = decimal inches. N.B. Fractional
practical inches have been rounded to the nearest 1/16 inch, which
may not always be a practical measurement when specifying sheet or
trim sizes in inches. "<" = less than; ">" = greater than


Millimeters

Decimal
Inch
Approximate
Fractional
Inch
Practical
Fractional
Inch
10.03937<3/640
20.07874>5/641/16
30.11811>7/641/8
40.15748>5/323/16
50.19685<13/643/16
60.23622>15/641/4
70.27559<9/321/4
80.31496>5/165/16
90.35433>11/323/8
100.39370<13/323/8
110.43307>27/647/16
120.47244>15/321/2
130.51181<33/641/2
140.55118>35/649/16
150.59055<19/329/16
160.62992<41/645/8
170.66929>21/3211/16
180.70866<23/3211/16
190.74803>47/643/4
200.78740>25/3213/16
210.82677<53/6413/16
220.86614>55/647/8
230.90551<29/327/8
240.94488<61/6415/16
250.98425>31/321

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Last modified: December 31 1969 19:00