Investment Growth Calculator
Investment Calculator: See How Your Money Can Grow
Use this free investment calculator to project how your contributions and compound returns can grow over time. Enter your starting amount, monthly contribution, expected rate of return, and time horizon to see your projected balance.
Key Inputs That Drive Your Results
- Initial investment — The lump sum you’re starting with, if any.
- Monthly contribution — How much you plan to add regularly.
- Expected annual return — Historical stock market averages are often used as a benchmark, though returns aren’t guaranteed.
- Time horizon — How many years you plan to stay invested.
Why Time Matters More Than You Think
Compound growth means your earnings start generating their own earnings. The longer your money stays invested, the more dramatic this effect becomes — which is why starting early, even with small amounts, often outperforms waiting to invest larger sums later. Try adjusting the time horizon in the calculator to see the difference.
Tips for Long-Term Investing
- Contribute consistently rather than trying to time the market.
- Reinvest dividends and returns to maximize compounding.
- Diversify across asset types to manage risk.
- Review your plan periodically, but avoid reacting to short-term swings.
Frequently Asked Questions
What rate of return should I use? Many investors use a conservative estimate based on historical long-term market averages, but your own expectations should reflect your specific investments and risk tolerance.
Does this account for inflation? This calculator projects nominal growth; keep in mind that inflation will reduce real purchasing power over time.
Can I model irregular contributions? The calculator assumes consistent monthly contributions for simplicity — for irregular amounts, try averaging your expected contributions.