Support
How the calculators work, where rates come from, and how to ask for help.
How the calculators work
Each calculator uses the numbers on the page and the assumptions printed next to the result. The math runs on your device. Change an input and the estimate updates. Saving a scenario keeps it on that device. It does not create an account.
Accuracy and financial advice
Results are estimates. A lender, servicer, plan administrator, or tax agency can use different dates, rounding, or fees. The tools are not financial, tax, or legal advice, and they are not a loan offer or a pre-approval.
Where rates come from
You type the rate or APR a scenario should use. The Rates page can also load national averages from FRED, the economic data service of the Federal Reserve Bank of St. Louis: 30-year and 15-year mortgage averages, the federal funds rate, the bank prime rate, the 10-year Treasury yield, and CPI inflation over the prior year. Each figure shows the observation date. If the request fails, the last saved response is shown with that date. These are not a quote from a lender in your area. The mortgage calculator’s 10-year rate stays an example.
Request a calculator
Email support@thecalculatorapp.com with the calculator you want and the inputs you expect to see. We read those notes. A request does not mean the calculator will be added.
Report a bug
Email support@thecalculatorapp.com. Include the calculator name, what you typed, what you expected, what you saw, and whether you were on the website or the iPhone app. Steps in order help us repeat it.
App version
This website is version 1.0.0. The iPhone app shows its version in Settings. App Store Connect addresses for the listing, once the app is submitted: https://thecalculatorapp.com/privacy and https://thecalculatorapp.com/support.