Retirement Calculator with Income Gap Analysis

Retirement Calculator detailed calculation results
Age	Projected balance	Contributions	Growth
33	$106,102.51	$99,400.00	$6,702.51
34	$128,730.52	$113,800.00	$14,930.52
35	$152,994.31	$128,200.00	$24,794.31
36	$179,012.13	$142,600.00	$36,412.13
37	$206,910.78	$157,000.00	$49,910.78
38	$236,826.23	$171,400.00	$65,426.23
39	$268,904.26	$185,800.00	$83,104.26
40	$303,301.23	$200,200.00	$103,101.23
41	$340,184.75	$214,600.00	$125,584.75
42	$379,734.58	$229,000.00	$150,734.58
43	$422,143.47	$243,400.00	$178,743.47
44	$467,618.11	$257,800.00	$209,818.11

At a glance

Retirement Calculator: quick answer

Project retirement savings, estimated retirement income, and the gap between your target lifestyle and projected portfolio.

Key inputs

Current age, Retirement age, Current retirement savings, and Monthly contribution.

What you get

Projected corpus, Required corpus, Inflation-adjusted income need, and Estimated annual retirement income.

Best way to use it

Build a realistic base case, then change one assumption at a time and compare the chart and table, not only the first result.

What this calculator does

This retirement calculator helps you connect today’s savings behavior to the future lifestyle you want to support. It projects how your current savings and regular contributions may grow by retirement, then compares that portfolio with your target retirement income.

Retirement planning becomes more realistic when it accounts for inflation. A lifestyle that costs a certain amount today may require materially more income decades from now, even if your standard of living does not change.

Households can use this page to stress-test retirement age assumptions, expected return ranges, and the contribution rate needed to narrow a future income gap.

This page is built for users who need a defensible planning answer, not just quick arithmetic. It translates "Current age", "Retirement age", and "Current retirement savings" into "Projected corpus", "Required corpus", and "Inflation-adjusted income need" so the trade-off is visible in one place instead of being hidden behind a single number.

How to use the retirement calculator

Enter your current age, target retirement age, current retirement savings, and monthly contribution.
Use Advanced options to include inflation, your desired annual retirement income, and a withdrawal rate assumption.
Read the gap card alongside the savings chart. The chart shows accumulation. The gap card shows whether that accumulation is likely to be enough.
Start with "Current age", "Retirement age", and "Current retirement savings", then check whether the first output cards already answer your question. After that, add advanced assumptions such as "Inflation rate" and "Desired annual retirement income" only when they are real enough to change the decision.

Formula and methodology

Savings are projected month by month until the retirement age using the expected annual return assumption.

Desired retirement income is grown by the inflation rate to estimate the amount needed in future money terms at the retirement date.

Estimated sustainable income is calculated using the selected withdrawal rate applied to the projected retirement corpus.

The model maps "Current age", "Retirement age", and "Current retirement savings" into "Projected corpus", "Required corpus", and "Inflation-adjusted income need" using the formulas shown on the page. Keeping those relationships visible makes it easier to separate the core economics from the optional adjustments and to understand which assumption is actually moving the answer.

Key formulas

Future income need = Desired income today × (1 + inflation)^years to retirement

Estimated sustainable income = Projected corpus × withdrawal rate

These formulas simplify retirement planning into an accumulation stage and a withdrawal stage so the results remain interpretable.

Worked example and practical context

A household saving steadily for 25 years may accumulate a large corpus, but the relevant question is whether that corpus can support the inflation-adjusted spending level expected at retirement.

Two plans with similar projected balances can produce very different outcomes if one assumes a much earlier retirement or a more conservative withdrawal rate.

How to interpret the results

Projected corpus is your estimated nest egg at retirement. Sustainable income is the annual amount that corpus might support under your withdrawal-rate assumption.

If income gap remains positive, your current plan may need a higher contribution rate, a later retirement age, lower target spending, or a combination of all three.

Read "Projected corpus" first, then use the other summary cards, the chart, and the detailed table to judge contributions, growth, and future purchasing power. In most finance decisions, the best option is the one that stays strong across the full picture, not just the one with the most attractive first number.

Common mistakes to avoid

Using today’s desired retirement income without adjusting it for inflation.
Assuming an overly high withdrawal rate that may not be sustainable across long retirements.
Treating investment returns as guaranteed rather than testing a range of outcomes.

Key terms

Retirement corpus: The total invested pool available when you stop accumulating and begin drawing income.
Withdrawal rate: The percentage of a retirement portfolio withdrawn annually to fund living costs.

Frequently asked questions

Practical answers about assumptions, results, and responsible use.

Why is my income gap so high?

Often because inflation-adjusted retirement income needs rise faster than expected, especially when retirement is many years away.

Is the 4% withdrawal rule exact?

No. It is a planning heuristic, not a guarantee, and a prudent rate can differ based on market conditions, tax treatment, and portfolio design.

Should I use nominal or real returns?

This calculator uses a nominal return assumption and shows inflation separately through the income-need comparison.

Can I use this for pension-heavy retirements?

Yes, but you should treat the desired retirement income field as the amount your portfolio needs to cover after pensions or other guaranteed income sources.

Which inputs change "Projected corpus" the most?

Start with "Current age", "Retirement age", and "Current retirement savings". Those assumptions usually drive "Projected corpus" far more than any optional adjustment. Once the base case is right, use advanced inputs only to reflect real fees, taxes, or timing differences.

What does "Projected corpus" tell me in practical terms?

"Projected corpus" is the fastest read on the outcome, but it should not be treated as the whole decision by itself. Use it as the headline number, then read the chart, table, and other summary cards to understand what is happening underneath.

Why should I look at "Required corpus" as well as "Projected corpus"?

Because "Projected corpus", "Required corpus", and "Inflation-adjusted income need" answer different parts of the same decision. A scenario can look good on the first number and still be weak once timing, total cost, or long-run value is included.

When should I use "Inflation rate"?

Use advanced fields such as "Inflation rate" and "Desired annual retirement income" when they are real and material in your case. If you are still exploring, leave them at zero first so the base case stays easy to interpret.

What happens if the advanced options stay at zero?

Then the calculator runs a simpler base case using the main inputs only. That is often the best place to start, because it makes it easier to see what changes once optional costs, fees, taxes, or adjustments are layered in.

Does the chart add anything beyond the summary cards?

Yes. The chart shows how the result develops over time, which is often the real decision point. It is especially useful when two scenarios have a similar headline result but very different timing or cost patterns.

What is the detailed table useful for?

Use the table when you need the period-by-period breakdown behind the summary. That is usually where users spot front-loaded interest, a slow payoff path, a contribution gap, or the exact point where one scenario becomes better than another.

Should I compare more than one retirement plan?

Yes. A base case and one stressed case usually give a much better planning view than a single run. Change one major assumption at a time so you can see what is actually responsible for the difference.

Retirement Calculator