Long-tail calculator page
Compound Interest With Monthly Contributions
If you save or invest every month, you need more than the basic lump-sum formula. This page shows what to focus on and links straight to the main calculator configured for recurring deposits.
Best setup: open the main compound interest calculator, enter your starting amount, annual rate, years, and monthly contribution, then compare end-of-period versus beginning-of-period deposits.
What changes when you contribute monthly?
- Your ending balance comes from both growth and new deposits.
- Time still matters more than tiny differences in frequency.
- Contributing earlier in each period usually produces a slightly higher outcome.
Illustrative example
| Starting amount | Monthly contribution | Rate | Years | Estimated ending balance |
|---|---|---|---|---|
| $5,000 | $300 | 7% | 20 | About $174,000 |
Best next step
Run your own numbers in the full calculator instead of relying on a generic chart. Real scenarios depend heavily on how long you keep contributing and whether the deposits happen at the beginning or end of each period.