Retirement Savings Calculator
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A retirement savings calculator projects whether your current savings rate will provide enough income in retirement. It combines compound growth of existing savings, future contributions, and estimates post-retirement income needs.
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Tip: Social Security replaces about 40% of pre-retirement income for average earners. Factor in your estimated SS benefit (find it at ssa.gov) to reduce the portfolio size you need to build.
- 1Project current savings forward at expected return rate
- 2Add future contributions compounded to retirement date
- 3At retirement, apply the 4% withdrawal rule to estimate sustainable annual income
- 44% rule: withdraw 4% of the portfolio in year 1, then adjust for inflation annually
$100k saved at 35, saving $1k/month, retire at 65, 7% return=~$1.5M at retirement4% rule → $60k/year income
$0 saved at 25, $500/month, 7% return, retire at 65=~$1.3MStarting young matters more than amount
| Annual Income Needed | Portfolio Needed | Monthly to Save (30yr at 7%) |
|---|---|---|
| $30,000 | $750,000 | $650 |
| $50,000 | $1,250,000 | $1,083 |
| $75,000 | $1,875,000 | $1,624 |
| $100,000 | $2,500,000 | $2,165 |
| $150,000 | $3,750,000 | $3,248 |
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Fun Fact
The 4% rule originated from the "Trinity Study" (1998) by three Trinity University professors who analyzed historical 30-year retirement periods. It has held up in most historical scenarios but some planners now use 3.5% for longer retirements.
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