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":
Father: Stephen MANN
(Tetbury, Gloucestershire, England;16 Mar 1821 - Apr 1892)
Mother: Hester NELSON
(Tetbury, Gloucestershire, England;1820 - Jul 1869)
Mary Jane MANN
(Oct 1847 Tetbury, Gloucestershire, England - DECEASED)
Frederick BEARD
(Jan 1853 Tetbury, Gloucestershire, England - 3 Mar 1936 Birmingham, Warwickshire, England)
├─Esther Sarah BEARD
(12 Apr 1875 Gloucester, Gloucestershire, England - │ 19 Jan 1947 Birmingham, Warwickshire, England)
├─Mary Ann BEARD
(Jan 1877 Cirencester, Gloucestershire, England - DECEASED)
├─Emily BEARD
(Abt 1879 Gloucestershire, England - DECEASED)
└─Joseph Henry BEARD
(Birmingham, Warwickshire, England;20 Nov 1883 - 26 Apr 1943)
Winifred Marian RAMSELL
(4 Jan 1885 Wellington, Shropshire, England - Oct 1977 Birmingham, West Midlands, England)(m. Oct 1916 King's Norton, Worcestershire, England)
└─Beryl M BEARD
(1921 Wellington, Shropshire, England - DECEASED)
1847 - DECEASED
Frederick BEARD 
(Jan 1853 Tetbury, Gloucestershire, England - 3 Mar 1936 Birmingham, Warwickshire, England)