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@Dammit
You need to establish what the resistance curve of your turbo is.
i.e. if there is a constant that governs the relationship between the speed of the roller and the amount of power required to turn it at that speed you can work out one if you know the other.
Whilst a power meter is a fairly expensive beast a speedo is quite affordable, and as you have one it sounds like you're onto a winner.
What model turbo do you have?
That bikcalculator thing looks to me to be for use outside btw.