Retirement Income Calculator
Estimates the annual income you'll need in retirement by adjusting your current income for a chosen replacement rate and projected inflation over the years until you retire. Use it when setting a savings target or stress-testing retirement plans.
About this calculator
The formula is: retirementIncome = currentIncome × (incomeReplacement / 100) × (1 + inflationRate / 100)^yearsUntilRetirement. It works in two steps. First, it applies the income replacement rate — typically 70–90% — to your current income, reflecting that retirees usually spend less on work-related costs, mortgages, and retirement savings contributions themselves. Second, it inflates that figure forward using the compound inflation formula (1 + r)^n, where r is the expected annual inflation rate and n is the years until retirement. This gives you a future-dollar figure: what that income level will cost in the prices of the year you retire. Without the inflation adjustment, you would systematically underestimate how much you need, because a dollar today buys significantly less twenty or thirty years from now.
How to use
Suppose your current income is $80,000, you want to replace 80% of it, expect 3% annual inflation, and retire in 25 years. Step 1: Replacement income in today's dollars = $80,000 × 0.80 = $64,000. Step 2: Inflate forward 25 years at 3%: $64,000 × (1.03)^25 = $64,000 × 2.0938 = $134,000. That means you'll need approximately $134,000 per year in future dollars when you retire. Subtract expected Social Security and pension income to find the gap your savings must cover.
Frequently asked questions
What income replacement rate should I use when planning for retirement?
Most financial planners recommend a replacement rate of 70–90% of pre-retirement income, with 80% being the most common rule of thumb. The logic is that in retirement you no longer pay payroll taxes, you're no longer saving for retirement itself (typically 10–15% of income), and work-related expenses like commuting and professional clothing disappear. However, if you plan to travel extensively, have significant healthcare costs, or carry a mortgage into retirement, a higher rate of 90–100% may be more appropriate. Your personal spending plan is ultimately more accurate than any generic percentage.
Why is inflation so important when calculating how much income I'll need in retirement?
Inflation erodes purchasing power over time, meaning a fixed dollar amount buys less each year. At 3% inflation, prices roughly double every 24 years. If you retire 25 years from now needing $64,000 in today's purchasing power, you'll actually need about $134,000 in future dollars to buy the same goods and services. Ignoring inflation leads to a severely underfunded retirement plan. Even a seemingly modest 2% inflation rate compounds to a 49% increase in prices over 20 years, making the (1 + r)^n adjustment in this formula one of the most consequential parts of the calculation.
How do I use my retirement income target to figure out how much to save?
Once you know your target annual retirement income in future dollars, subtract guaranteed income sources — Social Security, pension payments, rental income — to find your annual savings gap. Then multiply that gap by a safe withdrawal rate divisor: at the common 4% safe withdrawal rule, divide the annual gap by 0.04 to find the total portfolio needed. For example, a $50,000 annual gap requires a $1.25 million portfolio at retirement. You can then use a retirement savings or 401(k) calculator to back-solve how much you need to contribute monthly to reach that target by your retirement date.