Compound Interest Calculator

Calculate compound interest on loans with visual graphs and detailed amortization tables.

Please note: This is a personal tool. I am not a financial advisor — use at your own risk.

This tool provides a comprehensive analysis of your loan payments and compound interest. With the ability to set service and financial fees, it generates an accurate estimate of your loan repayment costs.

Results are presented in two interactive graphs and a detailed amortization table breaking down the full calculations.

Loan Parameters

Loan Amount

Interest Rate (%)

Loan Term (months)

Deposit

Monthly Service Fee

Once-Off Finance Cost

Loan Total

0.00

Monthly Fixed Rate

0.00

Extra Payments (optional)

Pay extra cash each month to see how much interest you save and how much sooner you pay off. From/to months are optional — leave blank to apply for the whole term.

Extra Monthly Amount

From Month (optional)

To Month (optional)

Impact of Extra Payments

Enter an extra monthly amount on the left to see how much interest and time you would save.

Built as a single page app

Need something like this for your business?

Service

Built as a single page app

Browser-only. Your tool data stays in your browser. Built for micro to large businesses.

See SPA service ›Service

Single page app developer in South Africa

Remote delivery across South Africa. ZAR pricing. Browser-only, API-connected, and embedded SPA work.

Learn more ›