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FIRE Number Calculator

Find your Financial Freedom target—and map out your journey there

Take control of your financial future with our interactive FIRE Number Calculator. Whether you’re dreaming of retiring early, creating a flexible lifestyle, or simply understanding how much you need to sustain your expenses, this tool makes it simple.

Our calculator allows you to model your finances realistically by separating savings into accessible ISA/non-pension funds and pension savings. It accounts for:

  • ISA & other savings you can use immediately to fund your pre-retirement years.
  • Pension savings that can only be accessed after your chosen pension age.
  • State Pension contributions from age 67 (optional).
  • Life expectancy so you can see how your FIRE plan holds up over a typical lifespan—and experiment with longer horizons.

With our interactive chart, you can visualize your year-by-year balances, track your progress towards your FIRE goal, and see the earliest age at which your combined assets could cover your annual expenses indefinitely.

Adjust assumptions such as growth rates, annual contributions, withdrawal rate, and expected lifespan to explore different scenarios. This makes it easier to understand the impact of your savings decisions and plan confidently for an early or comfortable retirement.

Take a step closer to financial independence today – your FIRE number is waiting.

Assumes £10,000/yr starting at age 67

Estimated FIRE Number

£0
Using 4% withdrawal rate
Projected at FIRE age: ISA £0 + Pension £0 = £0
Gap / Surplus: £0
Estimated FIRE age:
Note: Pension access only after Pension Age. State Pension assumed £10,000/yr from 67.

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