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: John BOLWELL
(Bradford On Avon, Wiltshire, England;Oct 1867 - 21 Jun 1921)
Mother: Sarah Ellen GODWIN
(Bradford On Avon, Wiltshire, England;12 Jun 1867 - Mar 1949)
Beatrice Dora BOLWELL
(12 Jul 1902 Bradford On Avon, Wiltshire, England - DECEASED North Battleford, Saskatchewan, Canada)
Randolph Frederick MEECH
(28 Feb 1897 Melksham, Wiltshire, England - 20 Jan 1951 South Marston, Wiltshire, England)
└─Patricia Joy MEECH
(14 Mar 1931 Toronto, Ontario, Canada - 14 Dec 1996 Ontario, Canada)
James Edward PRICE
(20 Sep 1930 North Sydney, Cape Breton, Nova Scotia, Canada - 13 Oct 2013 Caledon, Peel, Ontario, Canada)
1902 - DECEASED
Randolph Frederick MEECH 
(28 Feb 1897 Melksham, Wiltshire, England - 20 Jan 1951 South Marston, Wiltshire, England)