$1 Million Retirement Calculator

To use our compound interest calculator, enter your starting principal (the amount you're investing today), your expected annual interest rate, the number of years you'll invest, and how frequently interest compounds. Then click "Calculate" to see your projected final balance.

The compound interest formula is: A = P × (1 + r/n)^n×t, where P is principal, r is the annual rate as a decimal, n is compounding periods per year, and t is time in years.

The Path to $1 Million

• Starting with $100k (7%): Hits $1M in roughly 34 years with zero extra deposits.
• Starting with $50k (10%): Hits $1M in roughly 31.5 years.
• The Power of Time: Waiting 10 extra years means you need almost triple the starting capital.

The key takeaway: starting early makes an enormous difference. An investor who starts at 25 versus one who starts at 35 can accumulate double the wealth by retirement, even if they invest identical amounts.