Questions or corrections?
We welcome feedback about confusing assumptions, broken layouts, accessibility problems and calculation errors. When reporting a calculator problem, include the tool name, example input values, and the result you expected. Please avoid sending sensitive account information.
Email our team
For the fastest investigation, please include the name of the calculator and a simple example.
Corrections and updates
We aim to correct material formula errors and outdated reference rates. Marketplace terms and fee schedules can change, so independent verification remains important.