What Level does your Iron Storage need to be for Stronghold Level 19 (SH19)?

What level does your iron storage need to be to level stronghold to 19. Currently have 4 iron storage at 15 and I’m currently leveling stronghold to 18, just want to be prepared. Thank you

I don’t know precisely, but you need five at 18 for SH20.

So somewhere around 5 X 17 is my guess

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Thank you, appreciate the answer

I believe you are correct. It took me 5@18 for SH20 so I’d say level 17 would be just enough for 19

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Im near the last push towards SH20. To get to SH19 it takes 1719K which for me was three iron storages at 17 and 2 at 16. Im sure it could be done differently if you have any storages 18 or above but i believe thats the lowest combo possible. Then for SH20 it takes all five iron storages to be at level 18

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In my notes from months ago, I have this written:

SH 18
1276+28+28+28+29+29+29+29+29 = 1505
5 iron storage @ level 15

SH 19
1276+28+28+28+29+29+29+29+29+30*5+31+31+31 = 1748
2 iron storage @ level 16, 3 iron storage @ level 17

I am currently upgrading iron storage for level 19 stronghold. You will need 3x17 and 2x 16 to upgrade stronghold

The Empires & Puzzles Bible, while outdated for many things, has this data. It used to have a calculator for this, but I think once it got unlocked, it became outdated fast, as it was opened up to a free for all edit, and stuff got broken and removed.

LVL 19 Stronghold needs 1,719,000 Iron

I have a personal copy of the old one before it all went to pot, and your Iron Storage options are:
18-18-18-14-14
18-18-16-15-15
18-17-17-15-15
18-17-16-16-15
17-17-17-16-16

I think those are the combinations that work minimally

More building costs.
LVL 20 Stronghold needs 1,969,000 Iron
LVL 10 Barracks needs 2,068,000 Iron ( I know you didn’t ask about it, but it’s the only thing at the moment that costs more than LVL 20 Stronghold.)