Mari Sizes  Diameter vs Circumference;
Inches vs Centimeters
The international reach of Temari
creates some confusion when it comes to specifying mari size. North
America by culture and custom uses Imperial measurement (inches, feet,
yards), and by custom describes the size of "round things" using
diameter, which is the distance through the object at its widest point.
The rest of the world, uses Metric measurement (millimeters,
centimeters, meters) and usually defines the size of "round things" by
circumference, which is the distance around the perimeter of the circle.
More than a few times people on both sides of the world have been caught
trying to make a diameter measurement as circumference, and vice versa;
(not an easy thing to pull off if you think about it). By convention,
given that the Japanese books are metricbased, we use circumference in
cm for measuring temari. Additionally, this solves the problem of "how
do I measure the diameter of a ball when I can't stick a ruler through
it?" (yes, that question has been asked, more than once....)  it is
much easier to measure the circumference (just wrap the tape measure
around the widest of the ball)
The best choice for temari
crafting is metric, for several reasons: it is the system used in the
Japanese books, and metric measurements are much easier to use (honest).
Remember, the preferred manner to describe distance in temari patterns
is relative, rather than absolute. This means describing a distance as
say, "1/2 of the distance from pole to equator", or some other relative
value of two landmarks on the mari, rather than say "1/2 inch" or "3cm".
Therefore, the use of actual absolute measurement usually is limited to
specifying mari sizes and spacing out 10 Combination divisions. No
matter what you are used to, using millimeters (mm) and centimeters (cm)
is so much easier, since one can divide and convert very simply.
Virtually all rulers and tape measures are printed with dual units, both
Imperial (also known as "English") and metric; the VRulers and C10
gauges used for 10 Combination dividing are marked in mm. Since almost
every ruler and tape measure has both inch and cm/mm markings, it
requires nothing other than taking on the switch, and it makes things so
very much easier.
When the occasion might arise that
a conversion needs to be done to "translate" a diameter measurement in
inches to circumference in cm, we only need to remember from school that
the circumference (the distance around the ball at its widest) is
obtained by measuring the diameter (the distance through the center of
the ball at its widest) and multiplying by "Pi"  a mathematical
constant of 3.14 (you don't need to understand why, just know that it
works). The other needed info is the conversion between inches and
centimeters (1 inch = 2.54 cm) While it may seem straightforward
to figure out diameter in inches from circumference in centimeters (and
vice versa)  most people would rather chew nails. To help
out, here is a quick reference to convert common mari sizes between
diameter in inches to circumference in centimeters. They are figured to
the nearest halfinch; you'll notice that for every halfinch in
diameter, the circumference increases by about 4cm. It's straightforward
and common sense to determine a quarterinch up or down (add or subtract
2 cm from the closest). Likewise if you need to convert something
larger, just add accordingly by 4cm per inch.
Conversion between
Diameter (inches) and Circumference (cm) for Mari Sizing

Diameter in Inches

Circum. in CM

2

16

2.5

20

3

24

3.5

28

4

32

4.5

36

5

40

5.5

44

6

48

6.5

52

7

56

7.5

60

8

64 
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