Free UK FIRE calculator

What's your financial freedom number?

Enter five numbers and see the wealth at which work becomes optional — and roughly how many years until you get there. Free, instant, and nothing to sign up for.

Investments, pensions and savings working toward freedom — typically excluding your home.

What you add to investments and savings in a typical month.

Yearly household spending you'd want covered, in today's money.

Use a real (after-inflation) return if spending is in today's money — commonly 3–5%.

4% is the classic rule of thumb; 3–3.5% is more cautious.

Your financial freedom number

£750,000

Estimated time to reach it

—

Progress so far

—

Assumptions: freedom number = annual spending ÷ withdrawal rate. Years are projected by compounding your current net worth and monthly savings at the return you chose, with no tax, fees or inflation drift modelled. This is planning information based on your inputs — not regulated financial advice or a personal recommendation.

Track this number automatically — free

Financial independence has a refreshingly simple core: when your invested wealth can sustainably cover your living costs, work becomes a choice. The calculator above finds that point — your "FIRE number" — and estimates how long your current savings rate takes to reach it.

The maths is deliberately transparent. Your freedom number is your target annual spending divided by a safe withdrawal rate — at the classic 4%, that's 25× your annual spending. The timeline compounds your current net worth plus monthly savings at your chosen return until it crosses that line. Change the withdrawal rate to 3.5% or the return to 3% and you'll see why assumptions matter more than precision: the honest answer is always a range.

Two things turn the estimate into progress. The first is knowing your real starting point — most people don't, because their wealth is scattered across pensions, ISAs and accounts. A net worth tracker fixes that. The second is watching the number move: in Tsang Portal's planning dashboard, your financial freedom progress is recalculated from your actual balances, privately and without linking a bank account — and a couple can track a shared target together.

Questions, answered

What is a FIRE number?

Your FIRE (Financial Independence, Retire Early) number is the amount of invested wealth at which your portfolio could sustainably cover your living costs, making work optional. A common rule of thumb is your annual spending divided by a safe withdrawal rate — at a 4% withdrawal rate, that's 25 times your annual spending.

What is the 4% rule?

The 4% rule is a rule of thumb from historical US market studies suggesting that withdrawing 4% of a balanced portfolio in the first year of retirement, then adjusting for inflation, has historically had a high chance of lasting 30 years. It is a planning shortcut, not a guarantee — many UK planners model more cautious rates such as 3% to 3.5%, which this calculator lets you choose.

Is this calculator financial advice?

No. The calculator is planning information based entirely on the numbers and assumptions you enter. It does not account for your personal tax position, pension access ages, inflation variability or market risk, and it is not a regulated financial advice service or a personal recommendation.

What return assumption should I use?

If you enter your target spending in today's money, it is common to use a real (after-inflation) return — historically often estimated in the range of 3% to 5% a year for diversified portfolios. The right number is uncertain and personal; try a few values and see how sensitive your timeline is.

Stop estimating. Start tracking the real number.

Free to start. No bank linking. Your progress, recalculated from your actual balances.

Create your free account