Retirement Calculator

Enter your current age, intended retirement age, and the age through which the scenario should run. The last age is a planning horizon, not a prediction of lifespan.

Add current retirement savings, a monthly contribution, and the monthly amount you expect to spend in retirement expressed in today's purchasing power.

Open the return and inflation section to adjust the effective annual return before retirement, the return during retirement, and inflation.

The result compares projected savings at retirement with the modeled balance required to fund withdrawals. It also shows the funding gap or surplus, required total monthly contribution, run-out status, chart, and annual schedule.

During accumulation, the current balance receives one month of modeled growth and the contribution is then added at month end.

At retirement, contributions stop. The balance receives one month of post-retirement growth before the inflation-adjusted spending amount is withdrawn.

The annual schedule summarizes both monthly simulations without replacing the underlying monthly timing.

Projected savings combine the future value of current savings with every modeled monthly contribution.

The before-retirement return is treated as an effective annual rate and converted to an equivalent monthly rate.

Because the model uses one smooth rate, the result cannot show market volatility or sequence-of-returns risk.

The calculator first inflates today's monthly spending target to the retirement date.

It then models every monthly withdrawal through the selected plan-through age and discounts those withdrawals back to the retirement date using the post-retirement return.

The required balance is therefore specific to the spending, inflation, return, retirement age, and planning horizon entered.

A funding gap appears when projected savings are below the modeled required balance. A projected surplus appears when savings are above it.

Funding progress divides projected savings by the required balance. It is a comparison within the selected fixed-rate scenario, not a probability of success.

Changing any assumption can materially change the comparison.

The required monthly contribution is the constant end-of-month amount that would mathematically reach the required balance from the current savings entered.

It is the total monthly contribution, not the extra amount above the current plan. The interface separately shows the increase needed from the current contribution.

The value depends entirely on the chosen return, spending, inflation, ages, and planning horizon.

The monthly spending input describes today's purchasing power. Inflation raises that amount to the retirement date and continues increasing withdrawals during retirement.

This helps avoid comparing a future nominal account balance with an unchanged present-day spending figure.

Actual spending rarely rises at one constant rate. Housing, healthcare, travel, taxes, and family support can follow different paths.

The forward drawdown simulation reports when the modeled savings balance can no longer fund the full planned withdrawal.

If the balance supports every modeled withdrawal, the calculator reports the amount left at the selected plan-through age.

A result that lasts through the horizon is not a guarantee. A poor sequence of returns, higher spending, fees, taxes, or a longer lifespan can change the outcome.

Run several assumptions rather than relying on one optimistic return or one precise future balance.

Compare a later retirement age, higher contribution, lower spending target, older plan-through age, and lower return assumptions.

The scenario table describes the usual direction of each change without claiming that any one adjustment is appropriate for a particular person.

The model excludes pensions, public retirement benefits, annuities, part-time work, rental income, taxes, investment fees, healthcare shocks, and required minimum distributions.

Those items can materially reduce withdrawals from savings or increase the amount needed.

Add them through a fuller planning process rather than treating this savings-only estimate as a complete retirement plan.

Investment returns arrive unevenly, inflation changes, spending evolves, and lifespan is uncertain.

The order of gains and losses matters especially during withdrawals because selling after losses can permanently reduce the capital available for recovery.

The calculator is best used to compare assumptions and identify which inputs have the greatest effect.

The calculation, chart, annual schedule, print view, and CSV export are produced locally in the browser.

The tool does not require an account, pension statement, tax record, or public share link.

The output is not a recommendation, guarantee, personalized plan, or substitute for professional advice and official benefit estimates.