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: Jonathan Daunt Bacon (Washington County, Tennessee, USA;28 Jan 1843 - 11 Jul 1904)
Mother: Mary Elizabeth Jones (23 Jul 1846 Washington County, Tennessee, USA - 10 Oct 1925 Jonesborough, Washington County, Tennessee, USA)
William Henry Bacon
(16 Apr 1877 Jonesborough, Washington County, Tennessee, USA - 1947 Iowa City, Johnson County, Iowa, USA)
Pearl Ella Crookshanks
(11 Feb 1883 Washington County, Tennessee, USA - Apr 1967 Iowa City, Johnson County, Iowa, USA)
├─Oscar Dean Bacon
(1908 Tennessee, USA - 30 Jul 1936 Cedar Rapids, Linn County, Iowa, USA)
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1877 - 1947 (69 years)
(23 Jul 1846 Washington County, Tennessee, USA - 10 Oct 1925 Jonesborough, Washington County, Tennessee, USA)
Pearl Ella Crookshanks 
(11 Feb 1883 Washington County, Tennessee, USA - Apr 1967 Iowa City, Johnson County, Iowa, USA)