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Finance Calc Kit
Retirement

Retirement Planning Calculator

Calculate your retirement corpus needs, monthly savings target, and projected income for a comfortable retirement.

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Required retirement corpus

$1,247,349.40

30 years to retirement, 25 years in retirement

Projected corpus at retirement

$1,296,934.07

Inflated monthly expense at retirement

$7,281.79

Surplus

$49,584.68

Projected savings exceed required corpus

Retirement plan summary

Years to retirement
30 years
Retirement duration
25 years
Required corpus
$1,247,349.40
Projected corpus
$1,296,934.07
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How to plan your retirement corpus

Retirement planning estimates how much you need at your target retirement age to fund future living expenses, compares that target to projected savings, and shows any gap you must close with higher contributions.

For FIRE-style early retirement timelines, use the early retirement calculator. To model workplace plan growth, try the 401(k) calculator. Once retired, test withdrawal sustainability with the retirement withdrawal calculator. To plan savings for a career break before retirement, use the sabbatical calculator. To compare Social Security claim ages and estimate break-even timing, use the Social Security calculator. To model tax-deferred annuity accumulation and annuitization payouts, use the variable annuity calculator.

Core retirement planning formulas

Years to Retirement=Retirement Age−Current Age\text{Years to Retirement} = \text{Retirement Age} - \text{Current Age}
Inflated Monthly Expense=Monthly Expenses×(1+i)n\text{Inflated Monthly Expense} = \text{Monthly Expenses} \times (1 + i)^{n}

Where i is the annual inflation rate and n is years until retirement. Required corpus is the present value of inflation-adjusted monthly withdrawals across your retirement years, discounted at your expected investment return.

Projected Corpus=FV(Current Savings+Monthly Contributions)\text{Projected Corpus} = \text{FV}(\text{Current Savings} + \text{Monthly Contributions})

Closing the savings gap

If projected corpus is below required corpus, the calculator solves for the additional monthly contribution needed between now and retirement, assuming your expected return and current savings trajectory.

Frequently asked questions

What return and inflation rates should I use?
Many planners use 6% to 8% nominal return and 2% to 3% inflation for long-term stock-heavy portfolios, but your allocation matters. Conservative investors often use lower return assumptions.
Does this include Social Security or pensions?
No. This calculator models portfolio-funded expenses only. Subtract guaranteed income from monthly needs before entering expenses, or reduce the retirement duration accordingly.
Why inflate expenses to retirement?
A $3,000 monthly budget today will not buy the same goods at retirement in 30 years. Inflating expenses aligns your target corpus with future purchasing power.
What if I already have enough projected savings?
The calculator shows a surplus when projected corpus exceeds required corpus. You may choose to retire earlier, reduce savings rate, or increase planned retirement spending.
Can I share my retirement scenario?
Yes. All inputs sync to the page URL so you can bookmark or share your plan.

Resources and references

The formulas and methods in this calculator were checked against these independent sources.