Cookie preferences
We use cookies for analytics. Privacy Policy You can accept or decline non-essential tracking.
Plan your retirement with compound interest calculations. See how your retirement savings grow over 20-40 years with regular contributions and compound returns.
Retirement savings benefit enormously from compound interest due to long time horizons. Using A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) − 1) / (r/n)]: contributing $500/month starting at age 25 with a 7% annual return yields approximately $1,199,000 by age 65. Starting at age 35 with the same contributions yields only $567,000 — less than half. Those 10 extra years of compounding are worth over $630,000.
At $500/month with 7% returns: starting at age 25 yields ~$1.2M, at 30 yields ~$830K, at 35 yields ~$567K, at 40 yields ~$381K, and at 45 yields ~$246K. To match the age-25 saver, someone starting at 35 would need to contribute approximately $1,060/month — more than double. The cost of waiting is the lost compounding, not just the missed contributions.
A common guideline is to save 15% of gross income. With compound interest at 7%, saving $500/month from age 25 can grow to over $1.2 million by 65. The exact amount depends on your desired retirement lifestyle, expected Social Security benefits, and other income sources.
Mortgage Calculator
Estimate monthly payment, amortization, escrow, and early payoff savings.
Loan Calculator
Calculate payment, total interest, fees, and early repayment savings.
ROI Calculator
Ad spend ROI and unit economics calculator.
Break-even Calculator
Estimate contribution margin, break-even units, break-even revenue, and target-profit sales volume.