FIRE & Early Retirement Calculators
For people who want work to become optional well before traditional retirement ages. Model your FIRE number, bridge years and different lifestyle levels.
🔥What is FIRE?
FIRE stands for Financial Independence, Retire Early. It’s a framework for building enough wealth through savings, investing and efficient spending to stop relying on traditional employment long before State Pension age. These calculators help you model your personal FIRE journey based on your UK assets, contributions and spending.
💡How these calculators help
Our FIRE calculators model your SIPPs, ISAs, GIAs, cash and rental income to show when you can retire, how much you need, and how different lifestyle choices affect your timeline. They account for UK tax rules, State Pension and realistic investment growth to give you a clear picture of your early retirement path.
Your FIRE Journey
A typical path to financial independence involves several key milestones. Use our calculators to track your progress at each stage.
Calculate Your FIRE Number
Determine how much you need to save based on your desired spending level. This is your target.
Find Your Retirement Age
Model your current trajectory to see when you could realistically reach FIRE with your current savings rate.
Explore Lifestyle Options
Compare Lean, Barista, and Fat FIRE to see how different spending levels affect your timeline and lifestyle.
Plan Your Bridge Years
If retiring before pension access age, model how ISAs and other accessible assets will bridge you to pension age.
Start with these popular calculators
These six tools are the best starting point for understanding your FIRE journey. They help you find your retirement age, calculate your FIRE number, and explore different lifestyle options.
FIRE Number Calculator
Calculate how much money you need to reach financial independence and retire early. Works out your FIRE number based on spending, income and investment mix.
Early Retirement Feasibility Calculator (FIRE Age Finder)
Discover the earliest age you can retire by modelling your SIPPs, ISAs, GIAs, cash and investment returns. See how your current trajectory affects your FIRE timeline.
Coast FIRE Calculator
Work out how much you need invested today so your money can grow to fund retirement later—without any further contributions. Perfect for planning a lower-stress career transition.
Lean / Barista / Fat FIRE Lifestyle Comparison Tool
Compare three FIRE lifestyles side by side: minimalist Lean FIRE, part-time supported Barista FIRE, and comfortable Fat FIRE. See how much wealth each requires.
Part-Time Work to Retire Early Calculator
See how switching from full-time work to part-time work can bring forward a more balanced lifestyle without sacrificing your long-term retirement goals.
Bridge-to-Retirement Modeller
Model how much money you need to bridge from early retirement to pension access age using ISAs and other accessible assets.
Getting Started with FIRE
New to FIRE? Do these in order. Each one is a calculator on this page.
- Start with the FIRE Number Calculator – work out how much you need from your spending. That’s your target.
- Use the Early Retirement Feasibility Calculator – see when that number might actually arrive on your current path.
- Compare Lean, Barista and Fat FIRE — use the Lean / Barista / Fat FIRE Comparison Tool to pick a timeline you can live with.
- Plan the gap before pension access — if you want out before you can touch a pension, use the Bridge to Retirement Calculator. ISAs and cash have to cover that stretch.
- Ease off rather than stop dead — Coast FIRE Calculator if you’d rather stop contributing. Part-Time Work to Retire Early Calculator if you’d rather drop hours.
- Stress-test the number — use the Safe Withdrawal Rate (SWR) Stress Tester. The target is only useful if it survives a bad market.
All FIRE & Early Retirement calculators
Browse all FIRE and early retirement calculators. These tools help you model different paths to financial independence, from Lean FIRE to Fat FIRE, and explore how savings, investments and lifestyle choices affect your retirement timeline.
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The 4% Rule Calculator (UK)
What is the 4% Rule Calculator? The 4% Rule Calculator helps you estimate either how much you may need to retire or how much income your existing retirement pot could potentially provide each year. Based on the well-known 4% rule, it offers a quick way to sense-check your retirement plans.…
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Can I Retire Calculator (UK)
When is it feasible for you to retire? The Can I Retire Calculator helps you estimate whether your current savings, pensions, investments, and future income may be enough to support retirement at your chosen age. By combining your retirement pot, expected spending, State Pension, and other key assumptions, the calculator…
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Retirement Countdown Calculator (UK)
What is the Retirement Countdown Calculator? The Retirement Countdown Calculator helps you see how many working days you have left until your planned retirement age. Rather than focusing on pension values or investment returns, it focuses on something more tangible: time. By taking your age, retirement target, working pattern, holidays,…
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Financial Runway Calculator (UK)
What is the Financial Runway Calculator? The Financial Runway Calculator helps you estimate how long your accessible money could last while you explore a life or career change. It is designed for people thinking about a sabbatical, part-time work, retraining, starting a business, or simply creating more breathing room. By…
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Barista Fire Calculator (UK)
What is the Barista FIRE Calculator? The Barista FIRE Calculator helps you explore whether semi-retirement could work for you in the UK. It looks at a mix of part-time income, investments, and pensions to estimate whether you can step away from full-time work while still covering your spending. Instead of…
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Redundancy Payment Early Retirement Calculator (UK)
What is the Redundancy & Early Retirement Calculator? The Redundancy & Early Retirement Calculator helps you work out whether redundancy could become a route into early retirement. It estimates your redundancy payout and compares three possible paths: retiring immediately, working part-time for a period, or continuing full-time work a little…
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Fat Fire Calculator (UK)
What is the Fat FIRE Calculator? The Fat FIRE Calculator helps you calculate how much you need and when you could retire in the UK with a comfortable, lifestyle-focused retirement. It models a retirement that includes travel, hobbies and discretionary spending, rather than just covering essentials. How the Calculator Works?…
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Lean Fire Calculator (UK)
What is the Lean FIRE Calculator? The Lean FIRE Calculator helps you work out how much you need to save and when you could reach financial independence in the UK with a lower annual spending target. It calculates your Lean FIRE number and estimates the age at which your savings…
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Time to Financial Independence Calculator (UK)
What is the Time to Financial Independence Calculator? The Time to Financial Independence Calculator helps you calculate how many years until you reach financial independence (FI). Financial Independence means your savings can support your annual expenses using a safe withdrawal rate, allowing you to stop working if you choose. The…
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Part-Time Work Break-Even Calculator (UK)
What is the Part-Time Work Break-Even Calculator? The Part-Time Work Break-Even Calculator helps you compare staying in full-time work versus switching to part-time work earlier, and understand when the part-time path financially catches up. It shows the trade-off between income, pension growth, total days worked and overall wellbeing across your…
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Minimum Pension Retirement Calculator (UK)
What is the Minimum Retirement Pension Calculator? The Minimum Retirement Pension Calculator helps you work out the smallest pension pot you need at pension access age to fund your retirement through to later life. It focuses on minimum viability rather than ideal outcomes, showing what is required to meet your…
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“Can I Afford to Quit?” Early Exit Retirement Calculator
What is the Early Exit Retirement Calculator? The Early Exit Calculator helps you work out whether you can quit full-time work earlier than planned and still fund the rest of your life comfortably. It models your finances from the age you stop working through to later life, showing whether your…
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One More Year Syndrome Calculator (UK)
What is the One More Year Syndrome Calculator? The One More Year Syndrome Calculator helps you compare retiring at your planned age versus working a few more years. It shows the financial benefit of delaying retirement alongside the real cost in lost years of freedom, helping you decide whether “just…
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FIRE Burn Rate Calculator (UK Specific)
What is the FIRE Burn Rate Calculator? The FIRE Burn Rate Calculator helps you understand how your annual spending directly affects your FIRE number and how quickly you can reach financial independence. By tracking your real spending and linking it to your investments and pensions, it shows how small changes…
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FIRE Number Calculator (UK Specific)
What is the FIRE Number Calculator? The FIRE Number Calculator helps you work out how much money you need to reach financial independence and retire early in the UK. It calculates your personal FIRE number based on your spending, income and investment mix, then projects when you could realistically reach…
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NHS Pension Early Retirement Reduction Calculator
What is the NHS Pension Early Retirement Reduction Calculator? The NHS Pension Early Retirement Calculator helps you understand how taking your NHS pension before your Normal Pension Age could permanently reduce your income. By modelling your scheme type, retirement age and expected pension, it shows how early retirement affects both…
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Probability Of Running Out Of Money Calculator
What is the Probability of Running Out of Money Calculator? The Probability of Running Out of Money Calculator helps you understand how likely it is that your retirement savings could be exhausted during your lifetime. By modelling your pensions, investments, property income and spending across many possible market outcomes, it…
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Die With Zero Calculator (UK Specific)
What is the Die With Zero Calculator? The Die With Zero Calculator helps you compare a traditional retirement approach with a Die With Zero approach, where spending is prioritised earlier in life when you are most able to enjoy it. The tool models lifetime spending paths, asset run-down, State Pension…
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Semi-Retirement Cashflow Calculator
What is the Semi-Retirement Cashflow Calculator? The Semi-Retirement Cashflow Calculator helps you model your transition from full-time work into a lower-income, more balanced semi-retired lifestyle. It shows how part-time income, investments and pensions can support your spending as you gradually move away from full-time employment. This lets you test when…
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Safe Withdrawal Rate (SWR) Stress Tester Calculator (UK Specific)
What does the Safe Withdrawal Rate (SWR) Stress Tester calculator do? The Safe Withdrawal Rate Stress Tester lets you see how long your retirement pot is likely to last based on your spending needs. It runs thousands of simulated market scenarios using Monte Carlo analysis and UK/Global portfolio assumptions to…
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Geo-Arbitrage Early Retirement Calculator
What is the Geo-Arbitrage Early Retirement Calculator? The Geo-Arbitrage Early Retirement Calculator shows how moving to a lower-cost area of the UK can bring your retirement or FIRE date forward. It models equity released from selling your current home, the impact of buying a cheaper property, changes to your mortgage,…
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Retirement Drawdown Planner (UK)
Have you planned how you will draw down your money in retirement? The Retirement Drawdown Planner helps you model how your cash, pensions, ISAs and investments can support you throughout retirement. It shows how long your money can last based on your spending, income sources, real returns and the order…
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Working Part-Time Impact On Retirement Calculator (UK Specific)
What is the Work Part-Time to Retire Early Calculator? The Work Part-Time to Retire Early Calculator shows how switching from full-time work to part-time work can bring forward a more balanced lifestyle without sacrificing your long-term retirement goals. Instead of adding extra work, it models a genuine transition to reduced…
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Coast Fire Calculator (UK Specific)
What is the Coast FIRE Calculator? The Coast FIRE Calculator helps you work out how much you need invested today so that, with no further pension or ISA contributions, your money can grow to fund retirement later. It’s designed for UK investors who want to know when they can stop…
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Lean / Barista / Fat FIRE Comparison Tool (UK Specific)
How much do you need for Lean, Barista and Fat FIRE in the UK? Which FIRE lifestyle fits your future? This calculator lets you compare Lean FIRE (minimalist), Barista FIRE (part-time work supported) and Fat FIRE (comfort-focused) to see how much wealth each requires. Adjust spending, income and growth assumptions…
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Early Retirement Feasibility Calculator (UK FIRE)
At what age can you reach financial independence in the UK, and how much wealth does it take? This interactive UK FIRE planning tool shows you how all your assets—SIPPs, ISAs, GIAs, cash and rental income can work together to fund early retirement. Test scenarios, adjust withdrawal rates, and instantly…
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Bridge to Retirement Calculator (UK)
How much money do you need to bridge to retirement? Discover how our interactive tool can help you map out exactly how long your savings will last and how much you need to earn to get to retirement. This is specific to the UK market. How the Calculator Works? Understand…