Work out the numbers before making the promise

Use these resources when a decision needs arithmetic rather than another general article. Each tool includes its formula, an illustrative example and the boundaries of the result. Replace the sample figures before using an output in your business.

The calculators run locally in the page. They do not connect to your store, save a history, submit orders or change prices. Reloading clears the entered scenario. If you print a result, review what is included and avoid entering customer or confidential financial information.

Keep cost definitions consistent. Gross margin is not the same as contribution after packaging and fees. A break-even order count depends on the contribution assumed. A shipping threshold is a scenario, not a guarantee that every basket will cover its delivery cost.

Run a conservative case as well as the expected case. Note where each input came from and compare the scenario with actual results later. These are planning aids, not tax, lending or investment advice, and no output is an automatic recommendation to spend money.