How Long Will My Money Last?
Calculate how long your savings will last based on your withdrawal rate and expected returns. Plan for retirement and financial security with accurate projections.
Your Money Duration Results
Money Duration Calculation
Where:
- Bₜ = Balance at time t
- P = Starting Balance
- W = Monthly Withdrawal
- r = Annual Interest Rate (as decimal)
- t = Number of Months
This formula calculates how long your money will last by determining when your balance reaches zero, considering both withdrawals and investment returns.
About This Calculator
This calculator helps you understand how long your savings will last based on your withdrawal rate, investment returns, and other factors. It’s particularly useful for retirement planning and long-term financial security.
The calculation assumes a constant withdrawal rate and investment return, which may vary in real life. Always consult with a financial advisor for personalized advice.
How The Calculation Works
This calculator uses the standard financial formula for determining how long money will last:
Balance = Principal + Interest – Withdrawals
The formula accounts for:
- Your starting savings balance
- Monthly withdrawals for expenses
- Investment returns (compound interest)
- Additional monthly contributions (if any)
Tips to Make Your Money Last Longer
- Consider a lower withdrawal rate (4% or less is often recommended)
- Invest in a diversified portfolio for better returns
- Include some growth investments to combat inflation
- Have an emergency fund to avoid tapping investments during market downturns
- Consider part-time work or passive income streams
- Review and adjust your plan annually
Frequently Asked Questions
This calculator uses standard financial formulas and provides accurate projections based on your inputs. However, actual results may vary due to market fluctuations, changes in spending, inflation, taxes, and other factors not accounted for in the calculation. It’s best used as a planning tool rather than a guarantee of future results.
The “4% rule” is a common guideline suggesting you can withdraw 4% of your initial retirement portfolio each year (adjusted for inflation) with a high probability of your money lasting 30 years. However, the ideal withdrawal rate depends on your age, investment portfolio, market conditions, and risk tolerance. Many financial advisors recommend starting with 3-4% and adjusting based on market performance.
Inflation reduces the purchasing power of your money over time. If your withdrawals don’t increase with inflation, your standard of living will decline. If they do increase, your money may not last as long. This calculator uses nominal values (not adjusted for inflation). To account for inflation, you might want to use a real rate of return (nominal return minus inflation) or increase your withdrawal amount annually.
Investment returns significantly impact how long your money will last. Higher returns extend the duration, while lower returns shorten it. Market volatility also matters – sequence of returns risk means that poor returns early in retirement can be particularly damaging. It’s wise to use conservative return estimates and have a flexible withdrawal strategy that can adapt to market conditions.
This calculator focuses on your investment portfolio. If you have other income sources like Social Security, pensions, or rental income, you can account for them by reducing your monthly withdrawal amount accordingly. For example, if you need ₹80,000 per month and receive ₹30,000 from a pension, you would enter ₹50,000 as your monthly withdrawal from investments.