Compound Interest Calculator
By FiscallyAI Editorial (AI-assisted) • Updated 2026-02-19 • Educational tool
See the magic of compound interest. Enter your numbers and watch your money grow.
Your Results
Future Value
$131,293
Total Contributions
$37,000
Interest Earned
$94,293
What Is Compound Interest?
Compound interest is interest earned on interest. When you save or invest money, you earn returns. Those returns then earn their own returns. Over time, this creates exponential growth.
Why Starting Early Matters
Time is the most powerful factor in compound interest. Someone who invests $100/month from age 20 to 30, then stops, will often end up with more money at 65 than someone who starts at 30 and invests $100/month until retirement.
Example: Starting at 20 vs 30
- Person A: $100/month, ages 20-65 (45 years) at 7% = ~$373,000
- Person B: $100/month, ages 30-65 (35 years) at 7% = ~$166,000
That 10-year head start? Worth over $200,000. Start now, even if it's small.
Disclaimer: This calculator is for educational purposes only. Past performance doesn't guarantee future results. 7% is not a prediction — actual returns vary. Not financial advice.