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)
Estimate either the retirement pot you may need or the annual income your existing pot could provide.
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Can I Retire Calculator (UK)
The Can I Retire Calculator helps you estimate whether your savings, pensions, and investments may be enough to support retirement at your chosen age.
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Retirement Countdown Calculator (UK)
See how many working days you have left until your planned retirement age.
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Financial Runway Calculator (UK)
Estimate how long your accessible money could last while you explore a life or career change.
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Barista Fire Calculator (UK)
Explore whether semi-retirement could work for you in the UK.
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Redundancy Payment Early Retirement Calculator (UK)
Work out whether redundancy could become a route into early retirement.
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Fat Fire Calculator (UK)
Calculate how much you need and when you could retire in the UK with a comfortable, lifestyle-focused retirement.
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Lean Fire Calculator (UK)
Work out how much you need to save and when you could reach financial independence in the UK with a lower spending target.
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Time to Financial Independence Calculator (UK)
Calculate how many years until you reach financial independence (FI).
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Part-Time Work Break-Even Calculator (UK)
Compare staying in full-time work versus switching to part-time work earlier.
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Minimum Pension Retirement Calculator (UK)
Work out the smallest pension pot you need at pension access age to fund your retirement through to later life.
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“Can I Afford to Quit?” Early Exit Retirement Calculator
Work out whether you can quit full-time work earlier than planned and still fund the rest of your life comfortably.
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One More Year Syndrome Calculator (UK)
Compare retiring at your planned age versus working a few more years.
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FIRE Burn Rate Calculator (UK Specific)
Understand how your annual spending directly affects your FIRE number and how quickly you can reach financial independence.
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FIRE Number Calculator (UK Specific)
Work out how much money you need to reach financial independence and retire early in the UK.
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NHS Pension Early Retirement Reduction Calculator
Understand how taking your NHS pension before your Normal Pension Age could permanently reduce your income.
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Probability Of Running Out Of Money Calculator
Understand how likely it is that your retirement savings could be exhausted during your lifetime.
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Die With Zero Calculator (UK Specific)
Compare a traditional retirement approach with a Die With Zero approach, where spending is prioritised earlier in life.
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Semi-Retirement Cashflow Calculator
Model your transition from full-time work into a lower-income, more balanced semi-retired lifestyle.
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Safe Withdrawal Rate (SWR) Stress Tester Calculator (UK Specific)
See how long your retirement pot could last across thousands of simulated market paths, based on your spending.
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Geo-Arbitrage Early Retirement Calculator
See how moving to a lower-cost area of the UK can bring your retirement or FIRE date forward.
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Retirement Drawdown Planner (UK)
The Retirement Drawdown Planner helps you model how your cash, pensions, ISAs and investments can support you throughout retirement.
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Working Part-Time Impact On Retirement Calculator (UK Specific)
See how switching from full-time work to part-time work can bring a more balanced lifestyle without sacrificing your long-term retirement goals.
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Coast Fire Calculator (UK Specific)
Estimate how much you’d need invested today for your portfolio to grow to your desired retirement income.
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Lean vs Barista vs Fat FIRE Comparison (UK)
Compare Lean FIRE (minimalist), Barista FIRE (part-time work) and Fat FIRE (comfort-focused) to see how much wealth each lifestyle needs.
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Early Retirement Calculator (UK FIRE)
See the age you could reach financial independence, and how your pensions, ISAs, other investments, cash and rental income could fund early retirement.
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Bridge to Retirement Calculator (UK)
Work out how much you need to bridge the years between stopping work and your pensions starting, and how long your savings will last.