Completely inaccurate, no CP range, just a "guess" – Evolution Calculator GO! Review

Don't bother, this app doesn't take account of the actual I.V. of the Pokemon itself, so there's no accurate evolution estimation, just a mere guess as to what the evolved CP will be. Just use "The Silph Road". It's a free website that has an actual understanding of the Pokemon go app and when to actually evolve based on the IV percentage of 1st or 2nd stage Pokemon.
Review by Talkiewalkie12 on Evolution Calculator GO!.