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? Follow this step-by-step guide to start planning your early retirement journey.
- Start with the FIRE Number Calculator – Work out how much you need based on your desired spending level.
- Use the Early Retirement Feasibility Calculator – See when you could realistically retire with your current trajectory.
- Compare FIRE lifestyles – Use the Lean/Barista/Fat FIRE Comparison Tool to see how different spending levels affect your timeline.
- Plan your bridge years – If retiring before pension age, use the Bridge to Retirement Calculator to model how accessible assets will cover the gap.
- Explore part-time options – Consider Barista FIRE with the Part-Time Work Break-Even Calculator to see if reduced hours could work for you.
- Refine your plan – Use other calculators to model property decisions, tax optimization, and lifestyle choices that could accelerate your timeline.
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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Buy, Borrow, Die Calculator (UK)
What is the Buy / Borrow / Die Calculator? The Buy / Borrow / Die Calculator is an illustrative UK planning tool that compares two ways of funding yearly spending from an investment portfolio. One path models borrowing against investments while allowing the portfolio to continue growing. The other models…
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Home Bias vs Global Equity Calculator (UK)
What is the Home Bias vs Global Equity Calculator? The Home Bias vs Global Equity Calculator helps you compare three simple equity investing approaches: all UK shares, an all global portfolio, and your own UK/global mix. It is designed for UK investors who want to understand how “home bias” can…
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ISA Regular Contributions Calculator (UK)
What is the ISA Regular Contributions Calculator? The ISA Regular Contributions Calculator helps you estimate how regular monthly investing into a Stocks and Shares ISA could build up over the rest of the current tax year. It is designed for people planning ISA top-ups before the 5 April tax-year deadline,…
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ISA Millionaire Timeline Calculator (UK)
What is the ISA Millionaire Timeline Calculator? The ISA Millionaire Timeline Calculator shows how long it could take to build a £1,000,000 portfolio inside a Stocks and Shares ISA. It is built around UK ISA rules and focuses on one simple question: if you invest regularly and earn a steady…
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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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The Latte Factor Calculator (UK)
What is The Latte Factor Calculator? The Latte Factor Calculator helps you see how a small regular spend could grow if you redirected it into investing instead. It takes a daily amount, turns it into a monthly investment, and projects how it could build over time through compound growth. This…