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":
Clearanna Bowles
(Calvert County, Maryland, USA;1670 - 4 Aug 1716)
         ├─William Billingsley, Jr.
(1691 Calvert County, Maryland, USA - 16 Dec 1745 St Mary's County, Maryland, USA)
         │ Mary Emily Sumner
(Nov 1696 Calvert County, Maryland, USA - Dec 1740 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)
         │          │ Elizabeth Crabtree
(5 Nov 1726 St Johns Parish, Baltimore County, Maryland, USA - 5 Nov 1839 McMinn County, Tennessee, USA)
         │          │          ├─Samuel Billingsley
(Jun 1747 St Mary's, St Mary's County, Maryland, USA - 10 Jun 1816 Bledsoe County, Tennessee, USA) =>
         │          │          │ + Mary Griffith
(1 Sep 1753 Edgecombe County, North Carolina, USA - 1 Sep 1838 Bledsoe County, Tennessee, USA)
         │          │          ├─James Billingsley
(Oct 1749 Maryland, USA - 1809 Guilford County, North Carolina, USA)
         │          │          ├─Bazil Billingsley
(2 Jun 1764 Baltimore County, Maryland, USA - 1831 Richmond County, North Carolina, USA)
         │          │          ├─Walter Billingsley
(14 Jul 1761 Baltimore, Baltimore County, Maryland, USA - Aft 1840 Bradley County, Tennessee, USA)
         │          │          │ + Living
         │          │          ├─Elizabeth Billingsley
(1751 St Mary's County, Maryland, USA - 1781)
         │          │          │ + Teldean Lane
(Est 1750 - ??)
         │          │          ├─John Billingsley, Sr
(17 Aug 1753 St Mary's County, Maryland, USA - 19 Sep 1844 Warren County, Kentucky, USA) =>
         │          │          │ + Jean Millsaps
(7 May 1754 - 8 Feb 1842)
         │          │          ├─Martha Billingsley
(3 May 1760 Baltimore County, Maryland, USA - Jan 1786 Guilford County, North Carolina, USA)
         │          │          ├─William Henry Billingsley
(11 Oct 1758 Baltimore County, Maryland, USA -          │          │          │ Jul 1820 Rockingham County, North Carolina, USA)
         │          │          │ + Elizabeth Gowdy
(Est 1759 - ??)
         │          │          └─Claranna Billingsley
(1756 Maryland, USA - 1781)
         │          ├─Cyrus Billingsley
(1737/38 St Mary's County, Maryland, USA - Dec 1818 Monongalia County, West Virginia, USA)
         │          │ + Hannah Webster
(Maryland, USA - 1819)
         │          ├─William Sumner Billingsley
(1720 St Mary's County, Maryland, USA - ??)
         │          ├─Mary Sumner Billingsley
(Bef 1720 St Mary's County, Maryland, USA - ??)
         │          │ + John Wood
         │          ├─Margaret Billingsley
(1728 St Mary's County, Maryland, USA - ??)
         │          ├─Clearanna Billingsley
(1732 St Mary's County, Maryland, USA - ??)
         │          ├─Ann Billingsley
(1723 St Mary's County, Maryland, USA - ??)
         │          │ + Henry Hardesty
         │          ├─Francis Billingsley
(1736/37 St Mary's County, Maryland, USA - 1799 Wilkes County, Georgia, USA)
         │          │ + Asenath Howell
(31 Jan 1748 Baltimore County, Maryland, USA - ??)