What Your Savings Could Be Worth
See illustrative projections of compound interest growth. Compare contributions vs. interest earned with this transparent calculator.
Compound interest is often described in optimistic terms, and while it can be a meaningful factor in long-term growth, the actual results depend heavily on your inputs. This calculator shows you both sides: the projected final balance and exactly how much of that is contributions versus interest earned. The numbers are illustrative estimates based on what you enter — not predictions or guarantees. Use this when you want a transparent view of potential growth for planning purposes, when comparing different scenarios, or when setting realistic expectations. No marketing spin here — just the math. Enter your numbers, include optional contributions, and see what the projections suggest.
Calculator
Common use cases
- Comparing different saving scenarios transparently
- Understanding the breakdown of contributions vs. growth
- Setting realistic planning expectations
- Evaluating the potential effect of starting earlier or later
How to use
- Enter your initial principal amount (the money you're starting with)
- Input the annual interest rate as a percentage
- Specify the investment duration in years
- Select how often interest compounds (monthly is common for savings accounts)
- Optionally, enter a regular contribution amount and frequency
- View your projected final balance and interest earned
FAQ
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. This differs from simple interest, which is calculated only on the principal.
How are regular contributions calculated?
Contributions are added at the frequency you select and earn interest for the remaining duration. The calculation assumes contributions are made at the end of each period.
What's the difference between APR and APY?
APR (Annual Percentage Rate) does not account for compounding, while APY (Annual Percentage Yield) includes the effect of compound interest over a year.
Are these results guaranteed?
No. This calculator provides illustrative estimates based on the inputs you provide. Actual returns may vary based on market conditions and other factors.
Are these projections accurate?
They are illustrative estimates based on your inputs. Actual results depend on real-world factors like rate changes and consistency of contributions.
Why show total contributions separately?
So you can see what portion of the final balance represents your deposits versus projected interest. This provides a clearer picture for planning.
This calculator provides illustrative estimates for planning purposes only and does not constitute financial, tax, or legal advice.