New to Barista FIRE? My Barista FIRE UK guide covers the full maths, ISAs and pensions, and three worked examples. If you already know the drill, the calculator above is ready for your numbers.
How to use the Barista FIRE calculator
- Enter what you expect to spend each year. Your take home pay is a good starting point.
- Add the part-time income you plan to earn each year. Keep it realistic: £8,000 to £15,000 a year is a sensible range for a lot of people.
- Add what you’ve already got invested and how much you invest each month.
- Set growth (5% to start), withdrawal rate (4% to start) and your age. You’ll see your Barista FIRE number, how long it could take, and what full FIRE would need for comparison.
What is Barista FIRE?
Barista FIRE is when your investments cover part of your spending and part-time work covers the rest. The name comes from the idea of a relaxed job, like working in a coffee shop, but it can be anything: freelancing, consulting, seasonal work or a side hustle you enjoy.
Because your pot only needs to cover the gap, you need far less invested than for full FIRE, so you can step back from full-time work years earlier.
How the maths works
Barista FIRE number = (yearly spending – part-time income) ÷ withdrawal rate.
Spend £30,000 a year and earn £12,000 part-time, and your pot only needs to cover £18,000. At 4%, that’s £450,000, compared with £750,000 for full FIRE. The calculator assumes your part-time pay rises in line with your costs.
Worked example
You’re 30, spend £30,000 a year, plan to earn £12,000 part-time, have £20,000 invested and add £600 a month at 5% growth.
| Result | |
|---|---|
| Barista FIRE number | £450,000 |
| Time to get there | 25 years and 10 months |
| Age you’d reach it | 55 |
With the same savings, full FIRE (£750,000) would take 34 years, so you’d be working full-time until 64 instead of 55.
Part-time income makes a big difference. At £15,000 a year your number drops to £375,000 (age 53). At £8,000 it rises to £550,000 (age 58).
Growth isn’t guaranteed, and markets don’t rise in a straight line, so treat this as a midpoint rather than a promise.
When you invest, your capital is at risk.
Making Barista FIRE work in the UK
- Use tax-free wrappers. The calculator assumes your money grows without tax, as it would in an ISA or pension. In a general investment account you could pay tax on gains and dividends, so your real returns would be lower.
- Bridge to pension age. You usually can’t touch a pension until 55, rising to 57 on 6 April 2028, so an ISA often covers the early years.
- Part-time pay and tax. If £12,000 of part-time pay is your only taxable income, it sits under the £12,570 Personal Allowance, so there’s no Income Tax or National Insurance on it.
- The State Pension comes later. The full new State Pension is £241.30 a week in 2026/27, from State Pension age. Once it starts, you may need less part-time work.
Most of your pot will probably sit in a pension, so fees matter. I’ve compared the best pension providers on cost.
If your number looks too big
You have three levers: give it more time, cut your target spending, or plan for more part-time income. Small changes to each add up, so play with all three in the calculator.
What to do next
Barista FIRE FAQs
Does this calculator work for UK savers?
Yes. It works in pounds, and the tax and pension rules on this page are UK ones.
What growth rate does it use?
It starts at 5% a year and won’t go above 8%. Use growth after inflation to keep the answer in today’s money. Growth isn’t guaranteed.
Does it account for tax on investments?
It assumes your money is in tax-free wrappers like an ISA or pension. If you use a general investment account, your real returns would be lower after Capital Gains Tax and dividend tax.
Why use the 4% rule?
It’s the standard starting point for FIRE planning. It’s based on US market history, and UK returns have been a bit lower, so you can drop it to 3.5% to be more cautious.
How is this different from a normal FIRE calculator?
A normal FIRE calculator assumes you stop earning completely. This one takes your part-time income off your spending first, which shrinks the pot you need.