Tool for calculating ideal place for capital

[therother]

So, does this tool tkae such things into consdieration. i.e. Do you have to enter the financial details of all your cities into it?

Not that I'm aware.

[therother]

These are some discrepancies between the tool and the game - Tarentum is the capital.

Name	X	Y	dx	dy	dist	Game%	Calc%	Difference	Full Name
									
Antioch	200	55	86	-8	86.37	80	75	-5	Antioch
Londin	57	128	-57	65	86.45	80	75	-5	Londinium
Alesia	66	106	-48	43	64.44	50	55	5	Alesia
Alexan	178	19	64	-44	77.67	65	70	5	Alexandria
Aquin	116	101	2	38	38.05	25	30	5	Aquincum
Arreti	91	80	-23	17	28.60	15	20	5	Arretium
Capua	102	68	-12	5	13.00	0	5	5	Capua
Cherso	175	95	61	32	68.88	55	60	5	Chersonesos
Cirta	55	41	-59	-22	62.97	50	55	5	Cirta
Corin	139	50	25	-13	28.18	15	20	5	Corinth
Messa	106	51	-8	-12	14.42	0	5	5	Messana
Patavi	94	90	-20	27	33.60	20	25	5	Patavium
Salona	118	75	4	12	12.65	0	5	5	Salona
Segest	105	90	-9	27	28.46	15	20	5	Segestica
Sinope	190	80	76	17	77.88	65	70	5	Sinope
V_Gothi	111	136	-3	73	73.06	60	65	5	Vicus Gothi

The tool seems to be underestimating the grace distance as 12.5, whereas it seems to be ~15. Anything within 15 will have no penalty. That accounts for Capua & Messana.

The rest seem to be on the boundaries between two levels, e.g. 77.88 is rounded to 70 by the calculator, but is 65 in the game.

Edit: Looking at the data, it looks as if any city over 85 (or 86 perhaps) is rounded up to 80% penalty.