🏖️ Retirement Planning Tools 2026

Pension Calculator 2026

Project your retirement pot, monthly income and inflation-adjusted wealth — with bear, base & bull scenarios and a year-by-year milestone timeline.

🌍Country & Currency

Monthly income guaranteed from state pension, employer DB scheme, or Social Security — deducted from your income gap.

👤Personal Details

Average is around 80–85. Use 90–95 for a conservative plan.
What monthly income do you want in retirement? Used for the income gap analysis.
Applied to show after-tax monthly income. Use 0 for tax-free accounts (Roth IRA, ISA, etc.).

💵Savings & Contributions

Many employers match 3–6% of salary. Include here for a complete picture.
Models salary-linked contribution growth. 2% tracks typical inflation.

📊Return & Inflation

6–7% is typical for a diversified long-term portfolio before inflation.
Historical average is 2–3%. Use 3–4% for a cautious plan.
Withdrawal Rule
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Pension Calculator Guide: How Much Do You Really Need to Retire in 2026?

Updated March 2026 · 10-minute read · Retirement planning, pension pot, 4% rule, inflation, state pension

Most people know they should be saving for retirement but very few have a clear number in mind. This pension calculator is designed to close that gap — giving you a projected pension pot, an inflation-adjusted income estimate, and a concrete gap analysis showing whether you are on track or need to act.

Quick summary of how this calculator works:
Monthly contributions (yours + employer) compound at your chosen return rate over the years to retirement. At retirement, the 4% rule (or your chosen withdrawal rate) converts the pot into an estimated annual income. The inflation-adjusted view tells you what that pot is worth in today's purchasing power. The income gap compares your projected monthly income against your target, accounting for state pension or Social Security.

What Is a Pension Pot and How Big Does It Need to Be?

A pension pot (or retirement account) is the accumulated fund you draw from in retirement. Common UK accounts include SIPPs and workplace pensions. In the US, these are 401(k)s, IRAs, and Roth IRAs. In Australia, they are superannuation funds.

How large it needs to be depends on three things: how much you want to spend each month, how long you expect to live, and what other income sources you have. A very rough starting point is the "25× rule" — multiply your desired annual income by 25 to get the pot size that supports a 4% withdrawal indefinitely.

Example: Targeting $3,000/month in retirement
Annual income target: $3,000 × 12 = $36,000
Required pot at 4% rule: $36,000 ÷ 0.04 = $900,000
If you have $18,000/yr from Social Security, your pot only needs to cover $18,000/yr:
Required pot: $18,000 ÷ 0.04 = $450,000

Understanding the 4% Rule — and Its Limits

The 4% rule originates from research by William Bengen in 1994. He studied every 30-year period in US market history and found that a 4% initial withdrawal rate — adjusted for inflation annually — never depleted a diversified portfolio. Later research by the Trinity Study broadly confirmed this finding.

However, there are caveats. The rule was designed for a 30-year retirement beginning at 65. If you retire at 55, you may need a 40–50 year portfolio, which pushes some researchers toward 3.5% or even 3%. Sequence-of-returns risk — the possibility of a major market crash early in retirement — is the main threat to a 4% withdrawal strategy.

4% vs 3.5% vs 3% — what it means for your pot requirement:
Targeting $3,000/month ($36,000/year):
4.0% rule → pot needed: $900,000
3.5% rule → pot needed: $1,028,571
3.0% rule → pot needed: $1,200,000
A more conservative rule requires a 33% larger pot for the same income.

How Compound Growth Turns Small Contributions Into Large Pots

The most powerful tool in retirement planning is not a high salary — it is time. The earlier you start, the larger the proportion of your final pot that comes from investment growth rather than your own contributions. At 7% annual return over 35 years, every $1 you invest grows to roughly $10.68.

Monthly contribution Years investing Total contributed Pot at 7% annual return Growth %
$50020$120,000$262,481119%
$50030$180,000$566,764215%
$50035$210,000$866,420313%
$50040$240,000$1,312,754447%
$1,00030$360,000$1,133,528215%
$1,00035$420,000$1,732,840313%

The table illustrates why starting 5 or 10 years earlier can make a bigger difference than doubling your contribution later.

Inflation: The Silent Enemy of Retirement Savings

At 3% inflation, a pension pot of $1,000,000 in 30 years is worth roughly $412,000 in today's purchasing power. This is why the calculator always shows both the nominal value and the inflation-adjusted real value.

When setting your target monthly income, think in today's money — what would cover your rent, food, healthcare and leisure right now? Then trust the inflation-adjusted figure the calculator produces to confirm whether your plan hits that target in real terms.

Rule of 72 for inflation: Divide 72 by the inflation rate to find how many years it takes for prices to double. At 3% inflation: 72 ÷ 3 = 24 years. At 4%: 18 years. So if you retire in 2026 at 65 and live to 89, prices will have roughly doubled by the end of your retirement at 3% inflation.

Employer Contributions and State Pension: Free Money You Must Include

In the UK, auto-enrolment requires employers to contribute at least 3% of qualifying earnings. In the US, many employers match 3–6% of salary in a 401(k). In Australia, the Superannuation Guarantee is currently 11% of earnings. Including employer contributions in the calculator almost always reveals a meaningfully larger pot and faster path to your target.

The state pension or Social Security income is critical too. The full UK State Pension in 2026 is around £11,502 per year (£958/month). US Social Security averages about $1,907/month for those retiring at full retirement age. Enter this in the "State/Employer Pension" field so the income gap analysis shows what your personal pot actually needs to cover.

Bear, Base and Bull: Why You Should Always Plan for the Worst

Markets do not deliver a smooth 7% every year. The bear scenario (4% return) shows what your retirement looks like after a decade of poor market performance. The bull scenario (10% return) shows the upside. Sensible retirement planning means your lifestyle is sustainable in the bear case, not just the base case.

If the bear-case monthly income still meets your target after accounting for state pension, your plan is resilient. If not, the contribution sensitivity table shows exactly how much more you need to save per month to close the gap.

How to Use the Contribution Sensitivity Table

The sensitivity table shows your projected pension pot and monthly income at seven different contribution levels — from roughly half your current amount to double it. This answers one of the most common retirement questions: if I save $200/month more, does it actually make a difference?

In most cases the answer is a dramatic yes. Because of compounding over 20–35 years, an extra $200/month often translates to an extra $100,000–$200,000 in the final pot and an extra $300–$600/month in retirement income. The table makes this concrete and personalised.

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Pension Calculator — Frequently Asked Questions

How much pension do I need to retire comfortably?

A commonly used rule is to aim for a pension pot worth 25× your desired annual income (the "25× rule", equivalent to a 4% withdrawal rate). For a $36,000/year ($3,000/month) retirement, that means roughly $900,000 in your pot. Subtract the capitalised value of any state pension or guaranteed income to see what your personal savings need to cover. Use a lower withdrawal rate (3–3.5%) if you plan to retire before 65 or want a highly resilient plan.

What is the 4% rule and is it still valid in 2026?

The 4% rule suggests withdrawing 4% of your pot in year one of retirement and adjusting for inflation annually. Research suggests it has historically survived 30-year retirements across most market conditions. Some financial planners now prefer 3.5% given longer life expectancies and a lower expected return environment. The calculator lets you test 4%, 3.5%, 3% and a custom rate side by side.

What return rate should I use in the pension calculator?

For a diversified portfolio (roughly 60–70% equities), 6–7% annual return before inflation is a common long-term assumption. If you are in a more conservative allocation (bonds heavy, near retirement), use 4–5%. For an aggressive, equity-heavy strategy, you might use 8–9% but should stress-test the bear scenario at 4–5% as a sanity check.

Does the calculator include employer contributions?

Yes — there is a dedicated "Employer Monthly Contribution" field. Enter the actual cash amount your employer adds each month. This is separate from your own contribution so you can see exactly how much of the final pot came from each source. In the UK this is typically 3% of qualifying earnings; in the US, a common 401(k) match is 50% of your contribution up to 6% of salary.

How does the income gap analysis work?

You enter your target monthly income in retirement and the monthly value of any state pension or Social Security. The calculator subtracts state/employer pension from your target to find the income your personal pot needs to generate. It then compares this to your projected monthly withdrawal and flags whether you are on track (green), slightly short (amber), or significantly short (red).

What is the bear / base / bull scenario?

The three scenarios model different investment return environments. Bear uses a 4% return (poor market conditions). Base uses your entered return rate. Bull uses a 10% return (strong market conditions). Viewing all three helps you avoid planning only for the optimistic case. A resilient retirement plan works in the bear scenario without requiring major lifestyle changes.

Does the tax rate field reduce my projected income?

Yes. The estimated tax rate is applied to the gross monthly withdrawal to show an approximate after-tax monthly income in the stats grid. Set it to 0% if your savings are in a tax-free vehicle like a Roth IRA (US), ISA (UK), or TFSA (Canada), where withdrawals are not taxed. This is an estimate only — actual tax depends on your full income picture in retirement.

How does the contribution sensitivity table help?

It shows your projected pension pot and monthly income across seven different monthly contribution levels — from roughly half your current amount to double it. This makes it easy to see whether saving an extra $100, $200 or $500 per month changes your retirement picture meaningfully. Because of compounding, small increases sustained over decades often produce surprisingly large improvements.

Should I use the nominal pot value or the inflation-adjusted value?

Both matter for different reasons. The nominal value tells you how large the pot will be in future currency terms. The inflation-adjusted (real) value tells you what that pot is worth in today's purchasing power — which is more useful for comparing against your current living expenses. For example, a pot of $1.5 million in 30 years at 3% inflation is worth about $617,000 in today's money. Plan using the real value.

Is any of my data stored or saved?

No. All calculations run entirely in your browser. Nothing is sent to a server or stored. If you want to keep a record of your retirement plan, use the TXT or CSV download buttons in the results section to save a full report to your device.