Short answer
The real cost of SaaS is more than the subscription fee: set-up, data migration, integration, training, variable usage and exit cost belong in the total. Compare products by calculating them with the same user and volume assumptions, in the same period and against the same set of requirements.
Beyond the subscription
Consider migration, integration, training, administration and exit costs as well as licences. Features restricted to higher plans can change the total.
A commonly missed item is being forced onto a higher plan: the feature or integration you need may sit in a higher tier. Look not at the cheapest plan but at which plan your required feature list actually demands.
Usage scenarios
Calculate current and expected team usage separately. Verify storage, API, automation-run and AI charges in the provider’s terms.
Calculate two scenarios for team size: today's user count and the expected count in a year. With per-seat pricing, cost grows linearly with users; with usage-based pricing, your volume assumption determines the budget.
Spreadsheet structure
Separate one-off and monthly or annual costs. State tax, currency and exchange-rate assumptions explicitly. Compare the same time horizon and requirements.
In the spreadsheet, write the source next to each item: a price page, a quote or an internal estimate. A figure with an unclear source makes the sheet indefensible later.
Exit costs
Exporting data, preserving relationships, migrating and retraining teams takes effort. A low starting price does not imply an easy exit. Update estimates using actual quotes and usage data.
Test the exit cost before signing the contract: export a small data set and try importing it into another tool. Formats, relationships and missing fields become visible in this trial.
Cost item worksheet
Fill in the table below for each product. The last column shows where a figure can be verified.
A practical evaluation exercise
Calculate the current year and a growth scenario using the same user and transaction assumptions. Include seats, storage, API use, add-ons and support. Data cleanup, training, integration maintenance and exit effort may sit outside the subscription. Record currency and tax assumptions and compare against a dated, current supplier quote.
Present the result as a range rather than a single figure, and next to uncertain items write which information will be clarified and when.
Frequently asked questions
The questions we hear most often when calculating SaaS cost.
Are free or low-cost plans enough?
They may be at the start, but compare user, storage and integration limits with your real usage. Calculate the cost of moving to a higher plan in advance as you grow.
Prices change often, so is the calculation reliable?
Keep the sheet with the quote date and verify the current price with the provider before deciding. Official provider documents should be the basis for current prices and plan limits.
Is it cheaper to buy SaaS or build my own software?
That depends on the period of use, how specific the need is and who carries operations. For a comparison, see Buy SaaS or build your own software?.
How do I estimate integration cost?
For each data field, write the source of truth and the sync direction and count the failure cases. The number and maturity of integrations is the biggest driver of this item. Our SaaS selection and integration consulting service covers this assessment.
