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Frederick's father, Frederick Wilhelm I of Prussia, was somewhat short at 5'3'', as discussed in an article on the Potsdam Giants. But how tall was Frederick II?

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Frederick the Great was rather short as well.

5'2"

The city of Potsdam would be one source for giving you that number:

FRIEDERISIKO. Friedrich der Große Ausstellung der Stiftung preußische Schlösser und Gärten Berlin-Brandenburg | neues Palais und Park Sanssouci „Fünf Fuss, zwei Zoll“ (PDF)

With is cited by Google's answer box as 1,62 m, via WDR: Stichtag 24. Januar 1712 - Friedrich II. von Preußen wird geboren (and repeated on Friedrich II. der Große (Preußen))

enter image description here

Other sources give a height of just ~1,60m:

Friedrich den Großen von Preußen „klein“ zu finden, obwohl er nur um die 1,60 Meter

These may be a bit more complicated, as units of length weren't as standardised as today:

1 Dezimal-Fuß = 0,3766243 Meter (m)
1 Dezimal-Zoll = 0,03766243 Meter (m) (Das Königliche Magdeburger Maß von 1755 - 1816.)

Measures of length

With regard to the length measures, a distinction must be made between 3 different periods:

  1. the Berlin measure between 1713 and 1773.
  2. the Rhineland or also so-called Brandenburg measure between 1773 and 1816.
  3. the Prussian measure after 1816.

WP: Alte Maße und Gewichte (Preußen)

1 Preußischer (Rheinländischer Fuß) = 0,313853497 m
1 Preußischer Zoll (1/12 Fuß) = 0,0261545 m (University Dresden, Architecture, Old units of length, PDF)

The first would give an incredible height, and not dezimal but duodezimal was more often in use. So the numbers for the latter would be

~ 1,6213 m

The minimum height requirement in his army (except for artillery) was exactly 5 feet.


When Frederick was fourteen he was appointed Major of the Potsdam Grenadiers, in other words the giants, and spent part of his time at Potsdam. A very small major he must have seemed; as a grown-up man he measured five feet seven; he was a particularly thin and peaky boy whose face seemed to contain only two enormous blue eyes… — Nancy Mitford: "Frederick the Great", Hamish Hamilton: London, 1970.

With that number we arrive with a Prussian definition at 1,75 m;
we arrive with modern definition of length at 1,7 m.

No German language source I found corroborated this measurement of 5'7", Mitofrd doesn't give a source, and I strongly suspect some kind of conversion error in Mitford's biography.

In contrast, a nicely sourced reference gives the following:

Frederick the Great was in fact, according to his contemporaries, "somewhat below medium height", just five feet two inches, a maximum of five feet five inches, i.e. about 1.64 metres long. He was considered "petit" by his contemporaries even in the 18th century, when people were not as long on average as they are today.
— Wilhelm Bringmann: "Friedrich der Große. Ein Porträt", Herbert Utz Verlag: München, 2006. (Interestingly, also quoting Mitford, with 1.64 m, plus another source 'Vehse'. Alas, the snippet available now doesn't include the complete bibliography: PDF)

Example for a source quote in French and German attesting his petit physique:

enter image description here

Which gives us actually two different numbers for heights, one with suspicous exactness relating to when he was 19: 5 feet 2 inches and 3 lines. The other then contrasts this seemingly over-exact number without an actual source for it to the same measurements in feet and inch that is reported for Napoleon. But the latter height description for Frederick is then 5'5" (no lines) alleged by his last servant, shortly before his death:

enter image description here

What then follows is a description delivered by a French diplomat.

— Johann David Erdmann Preuss: "Friedrich der Grosse: Eine Lebensgeschichte", Band 1, p20, p 420. (Albeit the latter, lets call it 'rare' measurement, this author already acknowledges the servant source as "imprecise" with "5 feet 5 inch".
Note also the picture included here of Frederick's death mask. And keep in mind that the description of his nose in this written source from 1832 indicates that a certain hagiographic embellishment is certain in that source that also fails to specify which 'foot' it uses, and simply glosses over its own French source material being in conflict with itself, the French calling out a 'petit' man, while his biographer describes him 'of average height'. In any case, it is rather unlikely that the king continued to grow that much above his father after being a known smallish boy and later in old age walking standing rather bowed down. (Cf: — Bernd Krysmanski: "Nur Hogarth zeigt den Alten Fritz wahrheitsgemäß mit krummem „Zinken“. Die uns vertrauten Bilder von Pesne bis Menzel tun dies nicht", in: Effinger et al. (eds.): Von analogen und digitalen Zugängen zur Kunst – Festschrift für Hubertus Kohle zum 60. Geburtstag, Heidelberg: arthistoricum.net, Advance online publication, 07.06.2019, https://doi.org/10.11588/arthistoricum.493.c6566)

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  • This seems to be disputed, and Nancy Mitford's 1970 biography of Frederick the Great gives his height as 5' 7'' (or 170 cm). – Lars Bosteen Dec 22 '20 at 9:10
  • @LarsBosteen The Mitford ref is a ref, but one that I would doubt quite a bit (as explained). What is the source for 'seems to be disputed"? I'd like to weigh those arguments (unless you want your own A here ;) but cannot see any 'dispute'… – LаngLаngС Dec 22 '20 at 11:22
  • With your edit, you've already done plenty here so need for another answer I think. +1 – Lars Bosteen Dec 22 '20 at 12:30
  • @LarBosteen German sources use 5' 2" (Due) Prussian Feet, which is just under 5' 4" english feet. 1.6215764 meters when using the legal meter (139.13/443.296). – Mark Johnson Dec 22 '20 at 14:46
  • @MarkJohnson - Interestingly, Napoleon was also quoted at 5'2", but when adjusted from French to English feet that works out to more like 5'5". So Frederick was actually shorter than Napoleon (but at the time this was barely below male average, so that doesn't mean much). – T.E.D. Dec 22 '20 at 16:41
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At the age of 19, Friedrich the Great was

  • 5' 2" 3/12 (Prussian (Duo) Feet) = 1.6281150157 (legal) meters

accourding to literature published in 1832.

enter image description here


Note:
There are 2 values used for calculations from Prussian (Duo) Feet to meters

  • legal: where the value for amount of Paris Lines per meter has been rounded
    • 0.3138534974=(139.13/443.296)
  • exact: used for mathematical calculations
    • 0.3138535427=(139.13/443.295936)

enter image description here


Sources:

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