Question 1

Are the results accurate enough to rely on?

Accepted Answer

The arithmetic is exact for the formulas shown, and the mortgage schedule is computed month by month rather than approximated. For a loan, your bank may still quote a slightly different figure because of fees, insurance and its own rounding rules.

Question 2

Is anything I type saved?

Accepted Answer

No. The calculators make no network requests at all — the numbers never leave the page, and nothing is stored after you close the tab.

Question 3

Do the calculators work offline?

Accepted Answer

Yes. Once the page has loaded there are no further requests, so they keep working without a connection.