How Long to Reach Your Investment Goal
Results
Visualization
How It Works
We solve the annuity future-value equation for the number of periods n. Rearranging FV = Starting×(1+r)^n + P×((1+r)^n − 1)/r gives (1+r)^n = (FV + P/r) / (Starting + P/r), so n = ln(that ratio) / ln(1+r), with r as the monthly rate. The answer is in months and divided by 12 for years. The chart plots the balance climbing toward your goal line.
What Should You Do?
If the timeline feels too long, the two fastest levers are a larger monthly contribution and a longer investing head start — starting five years earlier often beats saving more later. Keep return assumptions modest; over-estimating them under-states the real time needed. Automate contributions so the plan runs without willpower.
Frequently Asked Questions
Why does it take so long early on?
At the start almost all of the balance is your own money. Compounding only becomes powerful after contributions have accumulated for many years.
What return should I assume?
Use 5-7% for a diversified stock-heavy portfolio long term. Higher assumptions shorten the timeline but add risk of falling short.
Can I change the contribution over time?
This tool uses a fixed monthly amount. For rising contributions, re-run with an average or use the fee/inflation simulators for context.
Does inflation affect my goal?
Yes — a future $1,000,000 buys less than today's. Our inflation erosion simulator shows the real value.
Is this a guarantee?
No. Markets fluctuate; this is a mathematical projection of your stated assumptions, not a promise.