This calculator provides estimates only and does not constitute financial advice. Pension values depend on market performance and are not guaranteed. Always consult a qualified financial adviser before making pension decisions.
How to Use the Pension Calculator
- Enter your current age — this is used to work out how many years until retirement and how long your investments have to grow.
- Set your retirement age — the default is 67, which is the UK State Pension age for most people. You can retire earlier or later depending on your circumstances.
- Enter your current pension pot — this is the total value of your existing pension savings. Check your latest pension statement or online account for this figure.
- Set your monthly contribution — enter how much you pay into your pension each month. Your employer's contribution is added separately using the employer match field.
- Adjust growth and inflation rates — the defaults of 5% growth and 2.5% inflation are reasonable long-term assumptions, but you can adjust them to model different scenarios.
- Click "Calculate" — the tool shows your projected pension pot in both nominal and real (inflation-adjusted) terms, plus estimated monthly retirement income using the 4% rule.
How UK Pensions Work
The UK pension system has two main pillars: the State Pension and workplace or personal pensions. The State Pension provides a baseline income of £221.20 per week (2025/26) if you have 35 qualifying years of National Insurance. Most people will also have a workplace pension through auto-enrolment, where both you and your employer contribute a percentage of your salary.
Your workplace pension grows through investment returns over time. The power of compound growth means that starting early makes an enormous difference — even small contributions in your twenties can outgrow much larger contributions made in your forties.
How much pension do I need to retire in the UK?
A common rule of thumb is that you need about two-thirds of your pre-retirement income. For someone earning £30,000, that means roughly £20,000 per year in retirement. Using the 4% withdrawal rule, you would need a pension pot of around £500,000 plus your State Pension entitlement of £11,502 per year.
What is the UK State Pension amount?
The full new State Pension for 2025/26 is £221.20 per week, which is £11,502.40 per year. You need 35 qualifying years of National Insurance contributions to get the full amount. You can check your State Pension forecast on the GOV.UK website.
What is the 4% rule for retirement?
The 4% rule suggests you can withdraw 4% of your pension pot in the first year of retirement and adjust for inflation each year thereafter. A £500,000 pot would provide roughly £20,000 in the first year. It is a guideline, not a guarantee, and actual sustainable withdrawal rates depend on market conditions.
How does employer pension matching work?
Under auto-enrolment, the minimum total contribution is 8% of qualifying earnings — at least 3% from your employer and 5% from you. Many employers offer to match higher contributions. For example, if you contribute 5%, your employer might also contribute 5%, effectively doubling your pension savings.
Should I adjust for inflation when planning my pension?
Yes. Inflation erodes the purchasing power of your savings over time. A pension pot of £500,000 in 30 years will buy significantly less than £500,000 today. Our calculator uses a default inflation rate of 2.5% to show your pot in today's money, giving you a more realistic picture of your future spending power.
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