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":
Elizabeth GAINES
(23 Mar 1736 Stafford County, Virginia, USA - 1771)
James Daniel Matheny
(1725 Hope Plantation, Stafford County, Virginia, USA - 1799 Alexandria Township, Hunterdon County, New Jersey, USA)
         ├─Mary Matheny
(16 Jan 1753 Stafford County, Virginia, USA - ??)
         ├─John Luke Matheny
(20 Dec 1754 Stafford County, Virginia, USA - 5 Aug 1839 Monroe County, Kentucky, USA)
         ├─James Matheny, II
(9 Sep 1756 Overwharton Parish, Stafford County, Virginia, USA -          │ 10 Apr 1832 Beech Run Hill, Preston County, West Virginia, USA)
         │ + Mary la Mayne
(23 Mar 1756 Westmoreland County, Virginia, USA - 1853 Preston County, West Virginia, USA)
         ├─Daniel Matheny
(1757 Shenandoah Valley, Virginia, USA - 1824 Barnwell County, South Carolina, USA)
         ├─Nathaniel Matheny
(1754 Hope Plantation, Stafford County, Virginia, USA - 1810 Monongalia County, West Virginia, USA)
         │ + Rachel Thompson
( - ?? Monongalia County, West Virginia, USA)
         ├─Jesse Matheny
(1761 Virginia, USA - 1860 Adams County, Ohio, USA)
         ├─Frederick Matheny
(1763 Shenandoah County, Virginia, USA - 1847 Athens, Athens County, Ohio, USA)
         ├─Elias Matheny
(1766 Berkeley, James County, Virginia, USA - 7 Feb 1862 Adams County, Ohio, USA)