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":
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┌──William Billingsley, Jr.
(1691 Calvert County, Maryland, USA - 16 Dec 1745 St Mary's County, Maryland, USA) =>
┌──James B Billingsley
(Apr 1726 St Mary's County, Maryland, USA - 25 Jan 1776 Guilford County, North Carolina, USA)
│ └──Mary Emily Sumner
(Nov 1696 Calvert County, Maryland, USA - Dec 1740 St Mary's County, Maryland, USA)
│
┌──Samuel Billingsley
(Jun 1747 St Mary's, St Mary's County, Maryland, USA - 10 Jun 1816 Bledsoe County, Tennessee, USA)
│ └──Elizabeth Crabtree
(5 Nov 1726 St Johns Parish, Baltimore County, Maryland, USA - 5 Nov 1839 McMinn County, Tennessee, USA)
│
John Billingsley (10 Sep 1781 Onslow County, North Carolina, USA - 25 May 1856 Bledsoe County, Tennessee, USA)
└──Mary Griffith
(1 Sep 1753 Edgecombe County, North Carolina, USA - 1 Sep 1838 Bledsoe County, Tennessee, USA)