learning · free Companion App · local in this browser
Course Refund Window Days Left
Turn a purchase date, a window, and the date you will ask into the deadline and the days left.
Enter your numbers
Enter only the details needed for this task. Check them against the original source.
Now set to . The result, the chart, and the meter follow the slider as you drag. Typing a number in the form above moves the slider to match.
Your result
Your result will appear here.
Engine self-test
Running golden cases…
Result chart
The bars are drawn from the numbers in your result and redraw on every compute. They show no new information and store nothing.
The chart is drawn from your result by this page's script. The text result above carries the same numbers.
Source notes
- U.S. Federal Trade Commission — Business Guidance
The FTC publishes advertising, pricing, and disclosure rules that apply to small businesses and freelancers.
Reviewed 2026-10-11. Industry-specific rules add to the general guidance. Check the rules that apply to your field.
What this App does not do
This App counts days from the dates you enter. It does not read a contract, contact a seller, or guarantee a refund.
This free App has no paid features. It does not contact an agency, employer, bank, seller, provider, or other person.