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you can calculate on steemnow. As post promoter service is now capped on -10 roi so that it will never cross -10.
And you will get same amount of vote between 1.05%-150%.

Screenshot_25.png

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so you don't need to send 5 sbd.
just try to keep it on 1.05%. and 4.15 sbd brings 1.05% on -10% roi, it will be more if the roi is high, I suggest to calculate on -10% roi as no one know how many can bid after you.
But lot less than 1.05%. Increase the bid amount by 0.1 sbd when steem price rise 5-10 cent on steemnow(not on coinmarketcap)

Wow! I wish I understood all that. lol. You know a lot more about all this than I do. I just keep on muddling my way through. Thanks for your advice.

I use Steem Now but don't know how t get to the calculator.

Click here, a new calculator tab will appear

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Btw post promoter changed the bid amount. now min bid is-5
For now 6 sbd is profitable.

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