Money & shopping
Compound interest calculator
Explore a savings balance with regular contributions and compounding.
A clear answer. Here’s how.
Uses your nominal annual rate and compounding frequency to derive an equivalent monthly growth rate. Adds monthly contributions at month-end. Assumes a constant rate and regular contributions. Shows nominal totals without taxes, fees or inflation; this is a scenario calculation, not a forecast.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Starting balance
- 1000
- Annual nominal interest (%)
- 5
- Years
- 10
- Monthly contribution
- 100
- Compounding
- Monthly
Example result
| Year | Balance | Total paid in | Interest |
|---|---|---|---|
| 1 | 2,279.04744704 | 2,200 | 79.0474470433 |
| 2 | 3,623.53338896 | 3,400 | 223.533388958 |
| 3 | 5,036.80578334 | 4,600 | 436.805783337 |
| 4 | 6,522.38387564 | 5,800 | 722.383875635 |
| 5 | 8,083.96696259 | 7,000 | 1,083.96696259 |
Constant-rate scenario; excludes taxes, fees and inflation.