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by ssharp 6221 days ago
I'd suggest $9.99 with a "trial". Give them a few calculations for free and then shut it down until they register.

I'd also suggest setting up a free web version but under a completely different name and domain. Slap on some relevant ads (Adsense, ebay, etc).

You're note going to destroy your market either way. You're not making anything right now, so experiment!