how long will retirement savings last calculator

How this retirement calculator works

This how long will retirement savings last calculator estimates portfolio longevity by simulating your retirement month by month. It starts with your current nest egg, grows it at your chosen return rate, subtracts withdrawals for expenses, and adjusts spending for inflation over time.

Unlike very basic tools, this version also lets you add guaranteed income such as Social Security or a pension, and optionally grow that income each year to reflect cost-of-living increases.

What inputs matter most

1) Annual spending in retirement

Your spending level is usually the biggest lever. Even a small reduction in annual spending can significantly extend how long savings last.

2) Investment return assumptions

Expected returns are uncertain. If your portfolio earns less than planned, savings may run out sooner. Conservative assumptions are usually safer for planning.

3) Inflation

Inflation quietly raises future costs. A retirement that looks affordable today can become strained 15 to 25 years later if inflation is underestimated.

4) Guaranteed income

Social Security, annuities, pensions, and rental income can reduce portfolio withdrawals. Lower withdrawals improve sustainability.

Interpreting your result

• Estimated duration: How long your current plan may last under your assumptions.
• Projected depletion date: Approximate calendar month when savings might reach zero.
• Year-by-year table: Shows spending growth, income support, and ending balance over time.

If your result is under your target retirement horizon (for example, 30+ years), consider adjusting spending, retirement age, or asset allocation with professional guidance.

Ways to make retirement savings last longer

• Delay retirement by 1 to 3 years.
• Reduce fixed expenses before retiring (housing, debt, subscriptions).
• Use a flexible withdrawal strategy instead of a fixed dollar amount.
• Delay Social Security to increase lifetime monthly benefits (where appropriate).
• Keep a diversified portfolio aligned with your risk tolerance.

Important planning notes

This calculator is an estimate, not a guarantee. Real outcomes depend on market sequence of returns, taxes, healthcare costs, long-term care events, policy changes, and personal spending behavior.

For a full retirement plan, pair this tool with:

• Tax-aware withdrawal planning
• Roth conversion analysis
• Healthcare and Medicare budgeting
• Estate and legacy planning

Frequently asked questions

Is the 4% rule built into this calculator?

No. This calculator uses your own spending and return assumptions. You can test a 4% style plan by setting first-year withdrawals around 4% of your initial portfolio.

What if my guaranteed income exceeds spending?

If guaranteed income covers all expenses, your portfolio may continue to grow under many scenarios. The tool will show that savings can last beyond the simulation period.

Should I use nominal or inflation-adjusted returns?

Enter nominal return expectations and a separate inflation estimate. The calculator handles inflation by increasing spending over time.

Educational use only. This is not financial, tax, or investment advice.