Who runs this site
Publisher: Just Interest Calculator, an independent educational finance-tool project maintained by the Digital Rich Kid web property team. The public contact channel is interestcalc.support@digitalrichkid.com.
The site is maintained through its public repository. It is not a bank, broker, lender, or regulated advisory service.
How content is maintained
Calculator pages are updated when formulas change, when examples become unclear, or when users report a credible calculation or content issue. The methodology page documents formulas and assumptions, and the editorial and corrections policies explain how updates are handled.
What the calculators are designed to do
- Estimate how a starting balance and recurring contributions may grow under a chosen average rate.
- Show how taxes and inflation can reduce the practical value of a nominal result.
- Work backward from a savings target to a monthly contribution or timeline.
- Estimate fixed-rate loan payments and the interest cost of carrying debt over time.
How the site works
The main calculators use standard future-value and amortization formulas. Results are generated client-side in the browser so the tool stays fast, lightweight, and usable without an account.
What this site does not do
- It does not provide personalized financial, legal, tax, or investment advice.
- It does not guarantee returns, lending terms, or future account balances.
- It does not replace lender disclosures, adviser recommendations, or tax planning.
Next step
If you want to use the tools immediately, start with the calculator page and then read the matching guide for the mode you used.