The paper length is not relevant since the chart flows from one page to the next.
Mobile
in.
mm
Portrait
2.75
70
For smart phones, not for printing
Landscape
5.5
140
For smart phones, not for printing
USA & Canada
in.
mm
Letter Portrait
8.5
216
Also Legal Portrait
Letter Landscape
11
279
Legal Landscape
14
356
Also Ledger Portrait
Ledger Landscape
17
432
International
in.
mm
A5 Portrait
5.82
148
A4 Portrait
8.25
210
Also A5 Landscape
A4 Landscape
11.71
297
Also A3 Landscape
A3 Landscape
16.54
420
The Text+ programs assume that the right and left margins are each about 25mm (1/2 inch) wide.
On the Format for Printing page, differences in page margins can be accommodated by the "fudge factor":
     │ + Seth W McClure (29 DEC 1883 Arkansas, USA -      │ JAN 1973 Lexington, Cleveland County, Oklahoma, USA)
     ┌──Grada Waeskie Hutcheson(17 OCT 1889 Texas, USA -      │ 7 NOV 1973 Purcell, McClain County, Oklahoma, USA)
     │ + Albert Alfred Anthony (23 JUL 1889 Arkansas, USA - 28 JUL 1953)
     ┌──Minnie Grescian Hutcheson(3 APR 1892 Springtown, Parker County, Texas, USA -      │ 27 FEB 1989 McClain County, Oklahoma, USA)
     │ + Hardy Allen (1 JAN 1890 Arkansas, USA -      │ 20 OCT 1972 McClain County, Oklahoma, USA)
     ┌──Lura Ouida (Donnie) Hutcheson(OCT 1894 Parker County, Texas, USA -      │ 1 DEC 1978 Purcell, McClain County, Oklahoma, USA)
     │ + Robert L Goldston (15 AUG 1893 Indian Territory, USA - 18 DEC 1944)
     ┌──Walter Eugene Hutcheson(23 JAN 1897 Parker County, Texas, USA -      │ 6 JAN 1964 Riverside County, California, USA)
     │ Dortha Cleo White (16 JAN 1908 Oklahoma, USA -      │ 30 MAY 2005 Caney, Montgomery County, Kansas, USA)
     │      ┌──Harrold E Hutcheson(ABT 1924 Oklahoma, USA -)