UK Pension Calculator — will your pensions actually be enough?

How the arithmetic works

Adding pensions together is awkward because they are not the same kind of thing. A defined contribution pot is a balance — £180,000, a number you can look up. A final salary scheme and the State Pension are promises of annual income. You cannot add £180,000 to £6,000 a year to £12,548 a year and get anything meaningful.

So this calculator picks one unit — annual income — and uses two conversions, which are mirror images of each other:

The 4% comes from the Trinity Study: withdraw about 4% of an invested pot in the first year, adjust for inflation after that, and there is a strong chance of it lasting thirty years. It is a rule of thumb, not a guarantee — sequence of returns, fees and how long you live all move it.

The ×20 is deliberately conservative, being the inverse of a 5% assumption. Real defined benefit transfer values often land anywhere between 20 and 40 times the annual income depending on the scheme and your age. Treat ×20 as a sensible floor, not a valuation — and note that valuing a final salary pension is not the same as cashing it in.

Common questions

Is this UK pension calculator free?

Yes, completely, with no sign‑up and no email. Every figure you type stays in your browser — nothing is sent to a server or stored.

What about the official pension calculators?

Use them, and use them first. The government’s State Pension forecast service tells you what your own State Pension will actually be, including any National Insurance gaps, and MoneyHelper has free government‑backed tools and guidance. Those are authoritative for the individual pieces. What they generally will not do is put a workplace pot, a final salary promise and the State Pension into one number, which is the gap this page fills. HMRC’s own tools deal with tax and allowances rather than projecting retirement income.

How much do I need to retire in the UK?

There is no single number, because it depends on whether the mortgage is paid off, whether you are one person or two, and what you want your life to look like. The Retirement Living Standards published by the Pensions and Lifetime Savings Association are a well‑known starting point, with minimum, moderate and comfortable tiers. Whatever figure you settle on, put it in the target box above and the calculator will tell you the gap.

Why does a small final salary pension change the picture so much?

Because ×20 is a big multiplier. A £6,000‑a‑year scheme most people mentally file as “a bit from an old job” is the equivalent of roughly £120,000 of capital — and it is usually inflation‑linked and guaranteed for life, which a pot is not. Leaving it out of the sum is the single most common way people frighten themselves unnecessarily.

Should I transfer my final salary pension into a pot?

Almost certainly not, and this calculator is not the place to decide it. You would be giving up a guaranteed, usually inflation‑linked income for life in exchange for a balance that can fall. For transfers above £30,000 regulated advice is a legal requirement, and most advisers will tell you not to. Older schemes can also carry guaranteed annuity rates, protected tax‑free cash or protected pension ages, none of which come with you.

Why is Step 2 kept separate?

Because Step 1 is arithmetic on numbers you can look up, and Step 2 is a forecast built on an assumption about markets you cannot. Most pension calculators blend the two and hand you one confident‑looking figure. Keeping them apart makes it obvious which half you can rely on.

Does this account for tax, or the 25% tax‑free lump sum?

No. Everything here is gross, before income tax, and it ignores the tax‑free cash you can usually take. It is a scale check, not a retirement plan.

General information, not financial advice. Your circumstances, your schemes’ rules and tax decide what is right for you. If you are making a decision that matters, speak to a regulated adviser.