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Retirement Calculator

Estimate the corpus required at retirement, project the corpus from your current savings plan, solve the monthly contribution gap, and model inflation-linked retirement withdrawals.

  • retirement planning
  • retirement corpus
  • how much to retire
  • retirement income
  • retirement savings gap

The age through which the retirement income stream is modeled.

The share of current living expenses expected to continue in retirement.

Pension, rent, annuity, or other income assumed to keep pace with inflation.

Include all regular contributions earmarked for retirement.

The percentage by which the monthly contribution is assumed to rise each year.

Optional gratuity, provident-fund, pension commutation, or other amount added at retirement.

Optional purchasing-power target to leave at life expectancy.

Adjusts both pre- and post-retirement returns in cautious and favourable cases.

Status: initial

Results

Awaiting calculation

Plan both sides of retirement

Build the corpus, then test the income

See the accumulation years and retirement drawdown as one connected plan, with spending, other income, inflation, investment returns, and legacy goals kept visible.

Your retirement journey
  1. Current savings₹1,000,000.00
  2. Projected corpus₹48,000,000.00
  3. Required corpus₹42,000,000.00
  4. Legacy balance₹6,000,000.00
₹42,000,000.00Total

How much of the goal is funded

Projected corpus
₹36,000,000.00
Remaining shortfall
₹6,000,000.00
Retirement readiness indicators
Goal funded86%
First-year withdrawal rate3.6%
Real post-retirement return1.9%

Turn the estimate into a resilient plan

  1. 1Separate essential retirement spending from optional lifestyle spending and one-time goals.
  2. 2Use realistic net returns before and after retirement, then compare the cautious scenario.
  3. 3Update contributions, pension income, inflation, life expectancy, and legacy needs at least annually.

A plan can look funded under one average return and still be fragile. Compare the cautious case, use net return assumptions, and revisit the model whenever spending, income, or retirement timing changes.

Calculator guide

Connect today's saving plan with tomorrow's retirement income

A retirement plan has two linked phases: building a corpus while you work and drawing inflation-adjusted income after you retire. This calculator estimates the corpus your lifestyle may require, projects what your current saving plan may accumulate, and shows the shortfall or surplus between them.

Answer both retirement questions in one plan

Use the calculator to estimate how much you may need at retirement and whether current savings, monthly contributions, future contribution increases, and lump-sum benefits may fund that need. The drawdown model also estimates sustainable income, corpus longevity, and a desired legacy amount.

How accumulation and drawdown are joined

Current retirement expenses and other income are inflated to the retirement date. The remaining monthly income gap becomes a growing withdrawal stream through life expectancy. Its value at retirement is calculated using the post-retirement return, then compared with a monthly projection of current savings and contributions under the pre-retirement return.

Variable explanations

Understand what each input and result means before calculating.

Current and retirement age

These determine how long savings can compound before withdrawals begin. Retiring later usually adds saving years and reduces retirement years.

Life expectancy

The age through which the plan funds retirement income. It is a planning horizon, not a prediction of lifespan.

Current monthly expenses

Regular living expenses stated in today's money. Separate major one-time goals or healthcare reserves may require additional planning.

Retirement expense percentage

The portion of current expenses expected to continue after retirement. A lower percentage is not automatically safer if healthcare, travel, or support costs rise.

Other retirement income

Monthly pension, annuity, rental, or other predictable income in today's money. The model assumes it keeps pace with inflation.

Current retirement savings

Money already earmarked for retirement across relevant accounts and investments.

Monthly contribution

The current amount added each month to retirement investments, including employer contributions when appropriate.

Annual contribution increase

The yearly percentage increase in monthly saving. This can represent step-up investing as income grows.

Pre-retirement return

The annual nominal return assumed while accumulating savings. It should reflect the portfolio and risk, not a guaranteed rate.

Post-retirement return

The annual nominal return assumed after withdrawals begin. Retirement portfolios often use a different risk mix than accumulation portfolios.

Inflation

The annual rate used to raise living expenses, other retirement income, and the purchasing-power legacy target.

Retirement benefits

Optional lump-sum benefits received at retirement and added to the projected corpus.

Legacy goal

The desired balance at life expectancy expressed in today's money. Enter zero if the plan intentionally spends down the modeled corpus.

Reviewed by the Calculator.org.in Editorial Team

Formula behavior, validation cases, explanatory examples, and cited sources are checked before publication. This review supports educational accuracy and is not a substitute for qualified professional advice.

Last reviewed: 2026-08-09

Review process

Formula guide

See the calculation logic, variable definitions, and practical meaning.

First-month retirement expense

Expense at retirement = Current monthly expense × retirement expense percentage × (1 + inflation)^years to retirement

  • The replacement percentage represents the share of current spending expected to continue.
  • Other retirement income is entered separately.

This translates the selected retirement lifestyle from today's money into nominal money at the retirement date.

Monthly income gap

Income gap = max(0, retirement expense − other retirement income)

  • Other income is assumed to retain its purchasing power and therefore rises with inflation.

The investment corpus funds only the expense not covered by pension, rent, annuity, or other recurring income.

Required retirement corpus

Corpus = PV at retirement of inflation-growing monthly income gaps + PV of legacy target

  • Withdrawals occur at the beginning of each month.
  • The legacy target is entered in today's purchasing power.

A growing-annuity calculation accounts for both investment return during retirement and continuing inflation.

Projected corpus

Next balance = Current balance × (1 + monthly return) + monthly contribution

  • The contribution can increase once each year.
  • Lump-sum retirement benefits are added at the retirement date.

The balance is simulated monthly from current age to retirement age.

Real post-retirement return

Real return = (1 + post-retirement return) ÷ (1 + inflation) − 1

  • Subtracting inflation is only an approximation; the ratio is the exact compounded real rate.

The real return indicates whether portfolio growth is expected to outpace the rising cost of the retirement lifestyle.

Required monthly contribution

Required contribution = remaining corpus gap ÷ future value of a ₹1 monthly increasing contribution stream

  • The same return and annual contribution-increase assumptions are used.

The calculator solves backwards for the starting monthly contribution needed to reach the required corpus.

Worked examples

Follow realistic inputs through the calculation step by step.

1

Worked example

Estimate a retirement corpus from current expenses

  1. 1Enter age 35, retirement at 60, life expectancy 85, and current expenses of ₹60,000 per month.
  2. 2Select 80% of current expenses for retirement and enter any inflation-linked pension or rent.
  3. 3The calculator inflates the income gap to age 60 and values the subsequent 25-year withdrawal stream.
2

Worked example

Check whether the current saving plan is on track

  1. 1Enter current retirement savings and the contribution made each month.
  2. 2Add the expected annual contribution increase and pre-retirement return.
  3. 3Compare the projected corpus with the required corpus and review the funded ratio.
3

Worked example

Solve the monthly saving shortfall

  1. 1Calculate the plan using the current monthly contribution.
  2. 2Read the required monthly contribution and additional contribution outputs.
  3. 3Test a later retirement age, lower spending target, or higher contribution increase without assuming a higher guaranteed return.
4

Worked example

Include a pension and retirement benefit

  1. 1Enter a monthly pension in today's money and the expected lump sum at retirement.
  2. 2The pension reduces the income gap, while the lump sum increases the projected corpus.
  3. 3Confirm whether the pension actually has inflation protection before using this assumption.
5

Worked example

Plan a legacy instead of spending the corpus to zero

  1. 1Enter a desired legacy amount in today's purchasing power.
  2. 2The calculator inflates it to life expectancy and discounts it back to the retirement date.
  3. 3Review how the legacy raises the required corpus and monthly saving requirement.

Common mistakes

Avoid these common input and interpretation errors.

Using today's expenses directly at retirement

Even moderate inflation can materially increase nominal spending over a long accumulation period.

Using the same return before and after retirement automatically

The investment mix and acceptable risk may change once withdrawals begin.

Ignoring other retirement income

Reliable pension or rental income can reduce the amount the investment corpus needs to provide.

Treating non-indexed income as inflation-linked

A fixed pension loses purchasing power. Reduce the entered amount or model it separately if it does not increase with inflation.

Planning only until average life expectancy

Living longer than the planning age creates longevity risk. Test a longer horizon.

Assuming returns occur smoothly

A constant-return projection does not capture market volatility or harmful losses early in retirement.

Forgetting investment fees and taxes

Use net return assumptions when possible because fees and taxes reduce both accumulation and retirement income.

Leaving healthcare and major one-time costs inside an optimistic budget

Healthcare, home repairs, family support, and travel can require separate buffers.

Treating the monthly contribution answer as permanent

Recalculate after salary, spending, portfolio, inflation, pension, or retirement-age changes.

Relying on one scenario

Review the cautious case, where returns are lower and inflation is higher, before judging readiness.

Frequently asked questions

Quick answers to the questions users ask most often.

How much money do I need to retire?
The answer depends on retirement spending, other income, retirement duration, inflation, post-retirement returns, and any legacy target. This calculator values the resulting monthly income gap at the retirement date.
What is a retirement corpus?
It is the pool of investments available at retirement to fund future withdrawals and any desired ending balance.
How does the calculator estimate retirement expenses?
It applies the selected retirement expense percentage to current monthly expenses and compounds that amount with inflation until retirement.
How are pension and rental income handled?
Other monthly retirement income reduces the expense gap funded by the corpus. The entered amount is in today's money and is assumed to keep pace with inflation.
Why are there separate pre- and post-retirement returns?
The portfolio, time horizon, withdrawals, and risk capacity can change at retirement, so one return assumption may not suit both phases.
How is the required monthly contribution calculated?
The calculator projects current savings and benefits, then solves for the starting monthly contribution whose future value closes the remaining required-corpus gap.
What does funded ratio mean?
It is projected retirement corpus divided by required corpus. A value below 100% indicates a modeled shortfall; above 100% indicates a modeled surplus.
What is a sustainable monthly retirement income?
It is the first month's estimated income supported by the projected corpus over the selected retirement horizon, including other income and preserving the entered legacy target.
What does age funds exhausted mean?
It is the approximate age at which the projected corpus can no longer cover the modeled inflation-growing income gap under constant returns.
Does the calculator use the 4% rule?
No. It calculates a horizon-specific growing withdrawal stream using the entered inflation and post-retirement return, then reports the resulting first-year withdrawal rate.
Can I use it for early retirement or FIRE planning?
Yes. Enter the earlier retirement age, a suitably long life expectancy, realistic expenses, and conservative return assumptions.
Does the model include taxes and fees?
No separate tax or fee fields are applied. Use expected returns after anticipated fees and taxes, and obtain professional guidance for account-specific treatment.
Does a funded result guarantee retirement security?
No. Returns, inflation, lifespan, spending, taxes, fees, healthcare needs, and pension income can differ from the assumptions.

References

Sources used to support the calculator guidance.

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Version history

A transparent record of calculator content updates.

Updated 2026-08-09
  • 1.0.0 · 2026-08-09

    Initial independent release combining retirement-corpus estimation, accumulation projection, contribution-gap solving, inflation-linked drawdown, pension income, retirement benefits, legacy planning, and scenario comparison.