Shopify true-cost calculator
A subscription price is only one line in the budget. Build a more useful first-year estimate with the costs you actually expect.
How to use the estimate
Run three versions: a lean case with free apps and theme, a realistic case, and a stress case with the tools you may add after launch. If the business only works in the lean case, validate demand before committing to a larger stack.
Do not confuse operating cost with total business cost. Inventory, packaging, creative production, advertising, returns, accounting, and tax can be much larger than the storefront software.
Official reference: Shopify pricing.