How to calculate compound interest in 3 easy steps
- 1
Enter your starting amount
Type your initial deposit or current balance — the amount you're starting with today.
- 2
Add contributions and rate
Set a monthly contribution (or leave it at zero), the expected annual return, and how many years you plan to invest.
- 3
Choose a compounding frequency
Pick daily, monthly, quarterly, or yearly compounding, then read your future balance and the interest earned chart.
Why use the compound interest calculator tool from Super Utility Hub?
Compound interest is the engine behind long-term investing — interest earned on interest, growing your money exponentially over time. The compound interest calculator projects exactly how your savings will grow, whether you're starting with a lump sum, adding monthly contributions, or both.
Choose how often interest compounds (daily, monthly, quarterly, or yearly), set an annual return, and the tool builds a year-by-year projection with a growth chart, total contributions, and total interest earned.
The calculation is instant and runs in your browser. It's a planning tool, not financial advice — real returns fluctuate, so use conservative estimates.
- Processes everything in your browser — no upload servers involved
- Free forever with unlimited uses
- Works on Windows, macOS, Linux, Android and iOS
- No watermark or branding on your output, ever
Frequently asked questions
What does compounding frequency change?
More frequent compounding earns slightly more interest on the same rate. Daily compounding gives the highest result, yearly the lowest — the difference is small over short terms.
What interest rate should I assume?
The historical US stock market has averaged roughly 7–10% annually before inflation. Use 7% for a balanced long-term estimate and 3–4% for conservative accounts.
Is this calculator for savings accounts too?
Yes. Enter the APY of a high-yield savings or CD account as the rate and set compounding to daily or monthly, matching how your bank quotes it.
Does it account for inflation?
No, the result is a nominal value. To estimate buying power, subtract your expected inflation rate (historically ~3%) from the assumed return.