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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ETF vs Managed Portfolio Fees Calculator
How can the fees of a Managed Portfolio vs ETF impact your retirement? Compare a low-cost global index fund (such as Vanguard FTSE Global All Cap at 0.23% OCF) against a typical UK managed portfolio charging 1–2% per year. See how fees compound over time and how much they can…
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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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Overpaying the Mortgage vs Investing
Mortgage Overpayments vs Investing Calculator (UK) Compare overpaying your mortgage vs investing spare cash (ISA or pension). See which strategy builds more wealth by retirement – and understand the crucial difference between liquid investments and property equity. How the Calculator Works? This calculator compares the long-term impact of overpaying your…