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CalcSpectrum

Retirement Calculator

Project your retirement nest egg from current savings, annual contributions, and an expected return rate, plus an estimated monthly retirement income.

Free to use · Instant results

Calculator Inputs

Sets the currency this calculator's numbers are denominated in. This is presentation only — it does NOT convert your numbers between currencies, it only changes how they're formatted.

Your current age in whole years.

The age you plan to retire. Must be greater than your current age.

Your current retirement account balance.

The amount you plan to contribute each year, assumed to be added at year-end.

The average annual investment return you expect.

Projected Nest Egg
$439,457.18
Est. Monthly Income (4% Rule)
$1,464.86
Total Contributions
$120,000.00
Total Investment Growth
$269,457.18
Years to Retirement
20
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About these results

CalcSpectrum calculators produce automated estimates using established formulas and the specific values you enter. Because real-world outcomes depend on input accuracy, mathematical assumptions, and rounding conventions, please verify critical figures with an appropriately qualified financial, tax, medical, legal, or other professional, as relevant.

Financial Notice: These figures are informational estimates for personal planning only. They do not constitute financial, investment, tax, or legal advice, nor do they represent a lending offer or credit approval. Provider and financial institution figures, rates, fees, and underwriting requirements may differ.

How It's Calculated

Formula

Nest Egg=S(1+r)t+C[(1+r)t−1r]Monthly Income=Nest Egg×0.0412\text{Nest Egg} = S(1+r)^t + C\left[\frac{(1+r)^t - 1}{r}\right] \qquad \text{Monthly Income} = \frac{\text{Nest Egg} \times 0.04}{12}

This calculator projects a retirement nest egg using the standard compound-growth formula for a starting balance plus a series of equal annual contributions (an ordinary annuity, with each contribution applied at year-end). Your current savings grow at the expected annual return rate for every year until retirement, and each year's contribution grows for the remaining years it has left to compound. The estimated monthly retirement income applies the widely cited '4% rule' — a common financial-literacy convention that assumes withdrawing 4% of the nest egg per year is broadly sustainable over a long retirement. This is a general heuristic, not personalized financial advice or a guarantee: actual sustainable withdrawal rates depend on market performance, inflation, retirement length, and individual circumstances.

Worked Examples

Age 45 to 65, $50,000 saved, $6,000/year, 7% return

  1. Years to retirement: 65 − 45 = 20
  2. Growth on current savings: 50,000 × (1.07)^20 ≈ $193,484
  3. Growth on contributions: 6,000 × [((1.07)^20 − 1) / 0.07] ≈ $245,973
  4. Projected nest egg: 193,484 + 245,973 ≈ $439,457
  5. Estimated monthly income (4% rule): (439,457 × 0.04) / 12 ≈ $1,465/month

Zero expected return: age 30 to 40, $10,000 saved, $2,000/year

  1. With a 0% return, growth adds nothing — the nest egg is simply the sum of savings and contributions
  2. Projected nest egg: 10,000 + (2,000 × 10) = $30,000

Frequently Asked Questions

What is the '4% rule,' and is it guaranteed to work?

The 4% rule is a commonly cited starting point for how much a retiree might withdraw annually from savings without running out of money over a typical multi-decade retirement, based on historical market analysis. It's a general heuristic, not a guarantee — it doesn't account for your specific market returns, inflation, retirement length, or spending needs, and shouldn't be treated as personalized financial advice.

When are annual contributions assumed to be made?

This calculator assumes each year's contribution is made at the END of that year (an 'ordinary annuity'), which is the standard convention for this type of projection. A contribution made at the start of the year instead would compound for one additional year and produce a slightly higher total.

Does this account for inflation, taxes, or employer matching?

No — this calculator projects nominal (not inflation-adjusted) growth from your own contributions and expected return only. It does not model taxes, fees, or an employer match; if you have an employer match, add it to your entered annual contribution to include it in the projection.

What happens if I enter a 0% expected return?

The projection becomes a simple sum with no compounding: your current savings plus each year's contribution added up, with no investment growth applied — a useful baseline for comparing against a growth scenario.