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Fractional and Decimal Inch and
Metric Conversion Tables

Measurements Useful in the Publishing Industry

To ensure accurate, economical printing when publications designed or typeset in one country are printed in a second country, it may be necessary to convert standard English (inch) measurements to metric measurements or vice versa; but fractional and decimal inches can complicate calculations (e.g., finding that 297 mm = 11.6929 inches may not be immediately useful). To help simplify calculations, EDS Inc., Editorial & Design Services, has published the following tables.

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

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
1/16 0.0625 1.5875 2
1/8 0.1250 3.1750 3
3/16 0.1875 4.7625 5
1/4 0.2500 6.3500 6
5/16 0.3125 7.9375 8
3/8 0.3750 9.5250 10
7/16 0.4375 11.1125 11
1/2 0.5000 12.7000 13
9/16 0.5625 14.2875 14
5/8 0.6250 15.8750 16
11/16 0.6875 17.4625 17
3/4 0.7500 19.0500 19
13/16 0.8125 20.6375 21
7/8 0.8750 22.2250 22
15/16 0.9375 23.8125 24
1.0 25.4 25

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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
1 0.03937 <3/64 0
2 0.07874 >5/64 1/16
3 0.11811 >7/64 1/8
4 0.15748 >5/32 3/16
5 0.19685 <13/64 3/16
6 0.23622 >15/64 1/4
7 0.27559 <9/32 1/4
8 0.31496 >5/16 5/16
9 0.35433 >11/32 3/8
10 0.39370 <13/32 3/8
11 0.43307 >27/64 7/16
12 0.47244 >15/32 1/2
13 0.51181 <33/64 1/2
14 0.55118 >35/64 9/16
15 0.59055 <19/32 9/16
16 0.62992 <41/64 5/8
17 0.66929 >21/32 11/16
18 0.70866 <23/32 11/16
19 0.74803 >47/64 3/4
20 0.78740 >25/32 13/16
21 0.82677 <53/64 13/16
22 0.86614 >55/64 7/8
23 0.90551 <29/32 7/8
24 0.94488 <61/64 15/16
25 0.98425 >31/32 1

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Last updated January 15, 2004.
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