Whether you are still building your retirement nest egg or are ready to start dipping into it, knowing how long your money will last is essential. Our free pension drawdown calculator helps you visualise your entire retirement journey, from your final years of work through to your 100th birthday.
You can use the tool above to model your savings and withdrawals, helping you find a sustainable income level that fits your lifestyle.
What our pension drawdown calculator can tell you
Unlike a simple payout tool, this calculator tracks your pension's value across two distinct phases: Accumulation (the years leading up to retirement) and Drawdown (the years you are taking an income).
By running the numbers, you can discover:
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The "Peak" Value: See how high your pension pot could grow by your planned retirement age based on your current savings and ongoing contributions.
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Income Sustainability: Determine exactly how long your desired monthly income will last. The tool will provide a clear message, such as "Your pension is estimated to last until age [X]".
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Long-term Value: View the estimated value of your fund at age 99, helping you plan for later life or potential inheritance.
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The Impact of Variables: See instantly how changes to investment growth, management fees, or inflation will affect your "real world" purchasing power.
How this calculator works
The calculator uses specific logic for each phase of your financial life to give you a comprehensive overview:
1. The Accumulation Phase (Pre-Retirement)
During this stage, the calculator models the growth of your current pot plus any ongoing monthly contributions you make. It uses the following formula to track your balance:
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New Balance = (Current Pot + Annual Contributions) x (1 + Growth Rate - Annual Costs)
2. The Drawdown Phase (Post-Retirement)
Once you reach your planned retirement age (currently a minimum of 55, rising to 57 in 2028), the tool shifts to modeling withdrawals.
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New Balance = (Current Pot x (1 + Growth Rate - Annual Costs)) - Annual Withdrawal
Why use this calculator?
Managing a pension drawdown is a balancing act. If you withdraw too much too soon, you risk running out of money; if you take too little, you may not enjoy the retirement you worked hard for.
This tool is designed to help you:
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Test different scenarios: Adjust your "Desired Monthly Income" or "Monthly Contributions" using the dynamic sliders to see the impact on your graph instantly.
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Factor in "Real" Costs: Many people forget to account for inflation or platform fees. Our calculator includes these as standard to give you a more realistic projection.
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Visualise the Journey: The interactive line graph makes it easy to see the "climb" toward retirement and the "spend" during it, helping you feel more in control of your financial future.
Important things to keep in mind
While our calculator is a powerful planning tool, it operates on a few key assumptions:
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Tax-Free Cash: It assumes your 25% tax-free lump sum remains in the pot to provide part of your monthly income, rather than being taken as a single separate payment.
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Private Pension Only: These figures reflect your private pension pots and do not include any State Pension income you may be entitled to.
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Constant Rates: The tool assumes that growth, charges, and inflation remain constant throughout the entire period, which may not happen in real market conditions.
Also keep in mind that any online calculator tool can only produce example figures and rough estimates. Get in touch below and one of our independent pension advisers will provided bespoke calculations and advice about your options.
Get 100% independent pension advice
Example calculations
To help you understand how different variables impact your retirement, the following tables illustrate potential scenarios for various pension pot sizes. These examples assume a standard 1% annual cost and an inflation rate of 2%.
Scenario A: The £100,000 Pension Pot
A £100,000 pot is often used to supplement the State Pension. Assuming a 4% investment growth rate, here is how different monthly withdrawals might affect the longevity of your fund:
|
Desired Monthly Income |
Growth Rate (Assumed) |
Estimated Sustainability |
|
£333 (4% annual withdrawal) |
4% |
Likely to last 30+ years |
|
£500 |
4% |
Pot may be exhausted by age 85–90 |
|
£800 |
4% |
Pot likely exhausted within 12–15 years |
Scenario B: The £250,000 Pension Pot
With a larger pot, you have more flexibility, but market performance becomes even more critical to your success.
|
Desired Monthly Income |
Growth Rate (Assumed) |
Estimated Sustainability |
|
£833 (4% annual withdrawal) |
5% |
Very sustainable; potential for fund to grow |
|
£1,250 (6% annual withdrawal) |
5% |
Pot may last until mid-80s |
|
£1,500 |
3% (Conservative) |
Higher risk of running out before age 80 |
Scenario C: Impact of Fees and Inflation
Even with the same pot size (£200,000) and withdrawal rate (£1,000/month), small changes in "hidden" variables like fees can shift your retirement date.
|
Annual Costs (%) |
Inflation Rate (%) |
Growth Rate |
Estimated Fund at Age 99 |
|
0.5% |
2% |
6% |
Significant surplus |
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1.5% |
2% |
6% |
Reduced surplus |
|
1.0% |
4% (High Inflation) |
6% |
Potential shortfall in later years |
Important Note: These tables are for illustrative purposes only. The "Sustainability Result" provided by the calculator is an estimate based on constant variables. Real-world factors like sequence of returns risk (poor market performance in early retirement) can significantly reduce how long your money lasts.
What to do after running your calculations
Our pension drawdown calculator is a great starting point for your research, but retirement planning is rarely a "set and forget" task. Small changes in market performance or personal circumstances can significantly alter your results.
If you want to ensure your drawdown strategy is as tax-efficient and sustainable as possible, it is often worth speaking to a specialist. At Money Helpdesk, we can connect you with independent, FCA-regulated pension advisers who offer:
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Free initial consultations with no obligation to proceed.
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Tailored drawdown strategies based on your specific income needs.
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Help comparing providers to minimise the impact of fees and charges.
Get started here to book in a free pension review today and connect with an independent financial adviser who specialises in pension drawdown guidance.
FAQs
The calculator uses "gross" figures - meaning the amount before tax is deducted. While 25% of your pension is usually tax-free, the remaining 75% is taxed as earned income. For simplicity, this tool assumes the tax-free portion remains in the pot to support your ongoing monthly income rather than being taken as a lump sum.