Your numbers
Apollo: 1 credit per record at $0.0196 a credit, its cheapest listed rate, times your volume. A vendor may not sell that volume at that rate, so use your own quote where you have one. Sources and plan limits: Apollo alternative. Solo covers one person up to 50,000 enrichments a week; past that, or for a team, Agency is unlimited for ordinary use.
How it works
Each vendor's rate is its cheapest listed price per credit and the credits one record costs, taken from its public pricing page and cited on our alternatives pages. The calculator multiplies that by your volume. Real bills can be higher: cheapest rates often need an annual plan or a large pack.
LeadOcean has no credits. Solo is $97 a month for one person, paced at 50,000 enrichments and 500,000 search records a week. Agency is $497 a month for teams, at 1M enrichments a day and 25M search records a month, both raisable. Counting an audience is free on every plan. See pricing.
Tools without a public per-credit rate
Some vendors publish no price at volume, or price by seat or flat plan, so they are not in the list. Their pages cover what they do publish: pricing breakdowns.