Pension Calculator UK – Retirement Projector

A free UK pension calculator that estimates where your pension pot could land by your target retirement age, based on your current pot, monthly contributions and an assumed growth rate. No sign-up, and nothing you enter is saved or sent anywhere.

*Calculated using a simplified 4%-a-year withdrawal assumption, purely to make the final figure tangible. It ignores tax, inflation, fees and the State Pension entirely. This is not a retirement plan — for that, a regulated financial adviser or a free service like MoneyHelper’s Pension Wise can help. Read more in our pensions guide.

How this pension calculator works

Enter your current age, the age you’d like to retire, your current pension pot, and your total monthly contribution — that’s your own contribution plus your employer’s and the tax relief added on top. Add an assumed annual growth rate, and the calculator projects your pot forward to retirement, compounding monthly. Real investment returns vary year to year and can be negative, so treat the figure as an illustration, not a promise.

How much do you need to retire?

There’s no single magic number — it depends on the lifestyle you want and what other income you’ll have, including the State Pension. Our guide on how much you need to retire walks through estimating a realistic target, and the State Pension guide explains the foundation your private pension builds on.

Making the most of your pension

Three levers move your result most: how much you contribute, how long it has to grow, and when you retire. If your employer matches higher contributions, capturing that match is one of the most effective moves available — see workplace pensions and auto-enrolment. Starting later? It’s rarely too late — see starting a pension late.

Frequently asked questions

How much will my pension be worth at retirement?+

This calculator gives an estimate based on your current pot, monthly contributions and an assumed growth rate, compounded to your retirement age. Actual outcomes depend on real investment performance, which varies and can be negative, plus charges and inflation.

What growth rate should I use?+

There’s no “correct” figure — a modest long-term illustrative average is sensible for a rough projection, but real returns vary year to year. Try a range of rates to see how sensitive the result is rather than relying on one optimistic number.

Does this include the State Pension?+

No — it projects only your private or workplace pension pot. The State Pension is separate and based on your National Insurance record. Check your forecast on gov.uk and read our State Pension guide for how the two fit together.

Is this pension calculator free?+

Yes, completely free with no sign-up. Everything runs in your browser and nothing you enter is stored or sent anywhere.