Computes the future value of an investment with compound interest, supporting five compounding frequencies (annual through daily) and an optional recurring monthly contribution. The result panel includes a three-segment visual bar showing the proportion of principal, contributions, and earned interest — making it easy to see how each component grows over time.
Common Use Cases
- Project retirement savings over 30 years with monthly contributions
- Compare daily vs. annual compounding for the same rate
- Calculate the future value of a fixed deposit
- Understand how starting earlier impacts long-term wealth
Output Fields
| Field | Description |
| Total Balance | Final value = compound growth of principal + future value of contributions |
| Principal | Your original starting investment |
| Interest Earned | Total balance minus principal and contributions |
| Contributions | Total of all monthly additions (monthly × 12 × years) |
| Effective Rate | Annual equivalent rate accounting for compounding frequency |
Formula Reference
A = P × (1 + r/n)^(n×t) | Contribution FV = C × ((1 + r/n)^(n×t) − 1) / (r/12)
How to Use
- Enter the Principal (initial investment amount).
- Enter the Annual Interest Rate as a percentage (e.g. 7 for 7%).
- Enter the number of Years.
- Select the Compound Frequency from the dropdown.
- Optionally enter a Monthly Contribution amount.
- Click Calculate to see the total balance and breakdown.
Tips & Notes
Note: The effective rate is always higher than the nominal rate when compounding more than once per year.
Note: Set Monthly Contribution to 0 to calculate pure compound interest on a lump sum.
Note: The visual bar makes it intuitive to see when interest surpasses the original principal.
