Software renewal cost
Compare an introductory rate with the later rate across users, setup costs and the full period you actually care about.
Independent tool: calculations run locally in your browser; tracked commercial links remain separately disclosed when present.
Normalize the whole horizon
Use one currency throughout. The model applies each monthly rate to the number of seats, separates the introductory and later periods, adds the one-time amount and spreads the result across the selected horizon.
Usage tiers, annual-billing discounts, tax, currency conversion, minimum commitments and changing feature packages are outside this simple model. Normalize those separately when they matter.
A higher modeled total does not by itself decide whether a tool should stay or go. Criticality, usage, overlap, switching friction and data portability also matter.
Freshness matters
Record the source and date for vendor inputs. Promotions, packages, billing terms and seat structures change; a saved scenario is historical evidence, not a promise of future pricing.