Retirement Calculator

How to use the retirement savings calculator

What this calculator does

This calculator estimates the monthly contribution needed to build a retirement fund that can cover the gap between your desired monthly retirement budget and your expected government pension. It also projects the balance at retirement, the monthly income that balance could support over the chosen retirement period, and the amount left after the target budget. It is a deterministic planning model, not an investment recommendation, tax forecast, longevity prediction, or guarantee of future returns.

When to use it

Use it when setting a recurring retirement contribution, comparing an earlier versus later retirement age, stress-testing a lower investment return, or checking whether an expected pension meaningfully reduces the savings burden. It is also useful before a benefits consultation because it separates public pension income from income that must come from personal savings.

How to calculate

1. The calculator opens with a complete demonstration for a 35-year-old planning to retire at 65 and fund expenses through age 88. The example XLSX is ready immediately.
2. Replace each sample with your own assumptions. Results update live; no Calculate button is needed.
3. Read Required monthly savings first, then compare Total savings at retirement, Retirement income from savings, and Money left after target budget.
4. Review the annual projection to see how contributions and investment growth build the balance over time.
5. Select Download Excel to export the current typed assumptions and projection. Reset clears the demonstration values and may disable export until all required fields are complete again.

Input guide

Current age is a required whole number from 18 to 99; for example, 35. A lower age usually gives more compounding time and lowers the required contribution. Retirement age is a required whole number above current age; for example, 65. Retiring later generally lowers the monthly saving need. Life expectancy is a required planning age above retirement age; for example, 88. A longer horizon requires a larger fund. Treat it as a conservative planning boundary, not a forecast.

Amount already saved is required U.S. dollars and may include commas or a dollar sign; for example, $50,000. Do not include home equity unless you intend to spend it. Annual investment return is a required percentage from 0% to 20%; for example, 6%. The model converts it to a monthly rate and assumes that rate remains constant, so avoid using an unusually high recent return. The SEC's compound interest calculator explains the same growth mechanism.

Monthly government pension is required in dollars; for example, $1,800. Use an official estimate rather than a guess. The Social Security Administration provides a retirement benefit planning guide. Monthly cost of living is required in today's dollars; for example, $5,000. Include recurring housing, food, healthcare, transport, and discretionary spending. Retirement budget percentage is required from 1% to 200%; for example, 80%. It converts current spending into a target retirement budget. A common mistake is assuming expenses automatically fall while omitting healthcare or travel.

Output guide and worked example

Required monthly savings is the recurring contribution needed until retirement. Total savings at retirement is the fund required to finance the pension shortfall over the retirement horizon. Retirement income from savings is the monthly withdrawal supported by that fund under the same return assumption. Total retirement income adds pension and savings income. Money left after target budget is total retirement income minus the target budget; values near zero mean the model is exactly funded, positive values indicate a modeled cushion, and negative values indicate a shortfall.

In the startup example, the target budget is 80% of $5,000, or $4,000 per month. After subtracting the $1,800 pension, savings must provide $2,200 monthly for 23 years. The calculator first determines the fund needed at age 65, then subtracts the future value of the existing $50,000 and solves for the equal monthly contribution over 30 years. The annual table reports Year, Age, Starting balance, Contributions, Investment growth, and Ending balance. These are estimates driven by the same current model and exported to Excel.