Compound Interest Example
Save $100/Month — Compound Interest Growth Example
How $100 monthly contributions grow with compound interest over 10, 20, and 30 years.
Scenario
$0 initial, $100/month contributions, monthly compounding at 7%.
Inputs
Monthly Contribution$100
Rate7%
Initial$0
Results
After 10 years$17,309
After 20 years$52,397
After 30 years$121,997
Contributed (30yr)$36,000
Interest earned (30yr)$85,997
Explanation
Saving just $100/month at 7% grows to $122k over 30 years — from only $36k contributed. The extra $86k is pure compounding. This proves that starting small and starting early outperforms saving more later.
Key Takeaways
- Increase contributions by 1% each year alongside salary raises.
- $100/month is roughly $3.30/day — the latte factor is real.