About Units of Measure (Visio)
When you insert fields into text or build formulas, you often specify units of measure for the values you type.
Microsoft Visio evaluates the result of a formula differently depending on the cell in which you enter the formula. In general, cells that represent shape position, a dimension, or an angle require a numberunit pair that consists of a number and the qualifying units needed to interpret the number. Many other cells don't require units and evaluate to a string, to TRUE or FALSE, or to an index. For example, the same formula that in the FillForegnd cell means color 5 from the drawing's color palette means TRUE (and locks the shape's width) in the LockWidth cell.
Always specify a unit of measure when you enter a formula in a cell that expects a dimensional value. If you do not specify a unit of measure, Visio uses the default unit for that cell, which can be page units, drawing units, type units, duration units, or angular units.
When indicating units of measure in ShapeSheet formulas, use the abbreviations listed in the following table.
To specify these units of measure  Use  Automation constant 

Centimeters  cm  visCentimeters (69) 
Ciceros  c  visCiceros (54) 
Date or time  date  visDate (40) 
Degrees  deg  visDegrees (81) 
Didots  d  visDidots (53) 
Elapsed weeks  ew  visElapsedWeek (43) 
Elapsed days  ed  visElapsedDay (44) 
Elapsed hours  eh  visElapsedHour (45) 
Elapsed minutes  em  visElapsedMin (46) 
Elapsed seconds  es  visElapsedSec (47) 
Feet  ft  visFeet (66) 
Inches  in  visInches (65) 
Kilometers  km  visKilometers (72) 
Meters  m  visMeters (71) 
Miles  mi  visMiles (68) 
Millimeters  mm  visMillimeters (70) 
Minutes  '  visMin (84) 
Nautical miles  nm  visNautMiles (76) 
Percent  %  visPercent (33) 
Picas  p  visPicas (51) 
Points  pt  visPoints (50) 
Radians  rad  visRadians (83) 
Seconds  "  visSec (85) 
Yards  yd  visYards (75) 
In formulas, you can express units of measure for compound numbers using the abbreviations in the following table. Visio simplifies the results and displays them in the compound units.
For example, if you enter 45.635°, Visio displays the equivalent value as 45° 38' 6".
To specify units  Use this abbreviation  Automation constant 

Ciceros and didots  CICERO/DIDOT  visCicerosAndDidots (52) 
Degrees, minutes, and seconds  °  visDegreeMinSec (82) 
Feet and inches  FEET/INCH  visFeetAndInches (67) 
Picas and points  PICAPOINTS  visPicasAndPoints (49) 
You can specify fractional units of measure in the DrawingScale cell to affect the number of ruler subdivisions that Visio displays in the drawing window. By default, Visio divides distances into tenths when drawing its rulers. If you use fractional units of measure in the DrawingScale cell, Visio divides distance into the following:

Eighths for visInchFrac and visMileFrac

Twelfths for visFeetAndInches
Fractional units of measure have no effect in cells other than in the DrawingScale cell.
To specify fractional units  Use this abbreviation  Automation constant 

Inches in fractions  IN_F  visInchFrac (73) 
Miles in fractions  MI_F  visMileFrac (74) 
Feet and inches  FEET/INCH  visFeetAndInches (67) 
In formulas, you can express units of measure for multidimensional numbers using the abbreviations in the following table. Visio simplifies the results and displays them in the multidimensional units.
To specify multidimensional units  Use this abbreviation  Automation constant 

Acre  ACRE  visAcre (36) 
Centimeters  SQ. CM., SQ CM, CM.^2, CM^2  visCentimeters (69) 
Feet  SQ. FT., SQ FT, FT.^2, FT^2  visFeet (66) 
Hectare  HECTARES, HECTARE, HA., HA  visHectare (37) 
Inches  SQ. IN., SQ IN, IN.^2, IN^2  visInches (65) 
Kilometers  SQ. KM., SQ KM, KM.^2, KM ^2  visKilometers (72) 
Meters  SQ. M., SQ M, M.^2, M ^2  visMeters (71) 
Miles  SQ. MI., SQ MI, MI.^2, MI ^2  visMiles (68) 
Millimeters  SQ. MM., SQ MM, MM.^2, MM ^2  visMillimeters (70) 
Yards  SQ. YD., SQ YD, YD.^2, YD^2  visYards (75) 
In localized versions of Visio, the set of recognized strings changes with the language. If you want your program to work with multiple languages, use the universal strings for units of measure.
For  Use 

Centimeters  CM 
Ciceros  C 
Ciceros and didots  CICERO/DIDOT 
Date or time  DATE 
Degrees  DEG 
Degrees, minutes, seconds  ° 
Didots  D 
Elapsed week  EW 
Elapsed day  ED 
Elapsed hour  EH 
Elapsed minute  EM 
Elapsed second  ES 
Feet  FT 
Feet and inches  FEET/INCH 
Inches  IN 
Inches in fractions  IN_F 
Kilometers  KM 
Meters  M 
Miles  MI 
Miles in fractions  MI_F 
Millimeters  MM 
Minutes  ' 
Nautical miles  NM 
Percent  % 
Picas  P 
Picas and points  PICAPOINTS 
Points  PT 
Radians  RAD 
Seconds  " 
Yards  YD 
When Visio parses and stores a numberunit pair, it can use explicit units or implicit units. A number expressed in explicit units always is displayed in the units of measure that were originally entered. A number expressed in implicit units always converts to the equivalent value in the drawing, page, or angular units appropriate for the cell.
For example, suppose you enter the equivalent of 1 inch in cell A using explicit units and in cell B using implicit units, and that both cell A and cell B use drawing units. Next, you change the default units for the page to centimeters. Cell A still displays 1 in., because it uses explicit units that don't change with the defaults. Cell B now displays 2.54 cm, the equivalent value in the default units.
To enter units implicitly, use the following syntax.
number [unit, flag]
number  The original value, such as 3.7, 1.7E4, or 5 1/2. 
unit  The units in which number originally is expressed. 
flag  The measurement system to use when the implicitvalue unit is displayed. See below for values. 
The element flag is one of the following letters (either uppercase or lowercase) indicating the measurement system that should be used when the implicitvalue unit is displayed.
flag  Measurement system  Example 

a, A  Angular  =5[deg,A] 
d, D  Drawing  =5[in,D] 
e, E  Duration  =5[eh,E] 
p, P  Page  =5[in,P] 
t, T  Type  =5[pt,T] 
Additionally, you can use the implicit units DL, DP, DT, DA, DE for implicit drawing, page, text, angular, and timeunits, respectively. These units assume the associated value is internal units. For example, if the current measurement system is centimeters, =2 DL would be interpreted as 2 internal units (inches) and displayed as 5.08 cm.
Using the implicit syntax described above, this expression (=2 DL) is equivalent to 2[in,d]. The implicit syntax gives you the choice of how to interpret the value, so you could also specify 2[ft,d], which would be interpreted as 2 feet, and displayed as 60.96 cm. The implicit units DL, DP, DT, DA, and DE are universal, and do not have localized counterparts.
Following are the default units of measure along with their equivalent settings in the user interface.
Default unit of measure  User interface equivalent 

visDrawingUnits  The units in the DrawingScale cell of the page or master containing the cell. 
visPageUnits  The units selected in the Measurement units box on the Page Properties tab of the Page Setup dialog box (on the Design tab, click the Page Setup arrow). 
visTypeUnits  The units selected in the Text box under Display on the Advanced tab of the Visio Options dialog box. 
visAngleUnits  The units selected in the Angle box under Display on the Advanced tab of the Visio Options dialog box. 
visDurationUnits  The units selected in the Duration box under Display on the Advanced tab of the Visio Options dialog box. 