Policies · effective 29 September 2026

Refund policy

All sales of the ebook are final. Because it is a digital download delivered immediately, we do not offer refunds.

Before you buy

The calculators on this site are free to use, and the full contents list is on the home page. Check both before you buy.

If your file won't open or download, email questebooks@gmail.com with your order number and we will send a working copy.

This policy does not limit any consumer rights you have under the law where you live.