Retirement Calculator

FINANCIAL MATH

Project your retirement savings from your current balance, monthly contributions, and expected return. Enter the details below.

Projected at Retirement
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Estimated balance.

Usage Tip

Increasing your monthly contribution even slightly, early on, often matters more than chasing a higher return. Capture any employer match first — it is free money.

THE MATH
Balance = current × (1+r)^n + monthly × (((1+r)^n − 1) ÷ r)
r = monthly return, n = months until retirement
Retirement projections compound your current savings plus ongoing contributions until you stop working.
Small changes in the return rate or start date have a large effect over decades.
Returns are not guaranteed; markets rise and fall, so treat this as a smooth long-run estimate.
Inflation reduces the future balance buying power; aim higher than a target set in today dollars.
Employer matches and tax-advantaged accounts (401k, IRA) can boost results beyond this simple projection.
Practical Notes

A retirement projection adds up your current savings, regular contributions, and the growth they earn between now and the age you plan to retire. The two things that change the result most are how long you have to save and the return you assume, so a few extra years of contributions or a higher savings rate can make a large difference.

The projection is an estimate. Returns vary, contributions may change, and the result is not adjusted for inflation, so the amount will buy less in the future than the same figure does today. Employer matches, taxes, and withdrawals in retirement are not included. Use the result as a starting point for planning and consider speaking with a qualified financial adviser about your own situation.

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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.