What Compound Interest Calculator helps you do
Project how an initial balance grows with recurring contributions and compound frequency, then compare illustrative return scenarios side by side. Useful for savings goals and education — not a market forecast.
All math runs locally in your browser. Haivix does not fetch market returns or store inputs.
How to use Compound Interest Calculator
- Enter starting balance, contribution amount, frequency, and compounding interval.
- Review projected balances and compare scenario rates such as 6%, 8%, and 10%.
When to use it
- Model monthly savings toward a target date with different assumed returns.
- Separate principal and growth when explaining compounding to stakeholders.
- Compare contribution timing (beginning vs end of period) on long horizons.
What to know before you start
- Assumed rates are hypothetical; actual investment returns vary and are not guaranteed.
Frequently Asked Questions
Yes. Nothing is uploaded. You supply the rate; Haivix does not fetch market returns.
Beginning adds each contribution before that period's growth. End adds it after. Beginning of period usually grows slightly faster.
Return assumptions change the outcome more than most people expect. The scenario table shows that without implying a forecast.
No. It is a mathematical projection from the rate you entered.