Family Freedom Number
Financial Freedom Calculator
How much money does your family really need? Add your living costs, your kids and the big one-time goals, and see the investable number that could let your portfolio cover your life.
- No account needed
- Nothing leaves your browser
- About 60 seconds
Build your family’s number
Change anything and the result updates as you type.
What if the withdrawal rate changes?
The withdrawal rate is the single most powerful assumption here. Same life, four different rates — tap any card to apply it to your numbers.
Only the ongoing lifestyle portfolio changes with the withdrawal rate. Child and one-time reserves are discounted at your real return instead.
How this calculator works
Everything is expressed in today’s purchasing power, and the investment return you enter is already net of inflation, so inflation is never subtracted twice anywhere in the maths. The target is the sum of three parts: a portfolio for ongoing living costs, a reserve for the limited years you support your children, and a reserve for one-time goals.
1. The ongoing lifestyle portfolio
Your monthly household spending is annualised, then capitalised at the withdrawal rate. This is the money that keeps funding ordinary life indefinitely.
2. Child-related expenses are finite
Child costs are entered separately and treated as a finite annuity over the number of years you specify, discounted at your real return: a dollar spent 15 years from now counts for less than a dollar today.
The formula assumes each year’s child costs are paid in one amount at the end of the year. If the money is actually spent through the year, the present value is somewhat higher, so this model can slightly understate the reserve needed for children. That is a simplified cash-flow assumption for V1 — not a claim about when you really pay.
3. One-time goals are added as they are
A housing reserve, a healthcare buffer and any other goal are added at face value in today’s dollars. They are not discounted because they are treated as amounts you want available now.
4. What you still need
The amount still needed is the target minus what you already invest, floored at zero. Progress is capped at 100%, so assets above the target show up as a surplus rather than a negative gap. When no target has been entered yet, progress is shown as a dash rather than a misleading percentage.
5. Two independent assumptions
The withdrawal rate and the real return are separate inputs: one sets how much you take out each year, the other how fast the portfolio is assumed to grow. They are not interchangeable, and setting them to the same number does not make a plan safe. Neither is a forecast.
The formulas
monthly expenses × 12
annual spending ÷ withdrawal rate
C × [1 − (1 + r)−n] ÷ r
C × n
housing + healthcare + other
lifestyle + child reserve + one-time
max(0, total − current assets)
min(100%, current assets ÷ total)
C = annual child-related spending · r = real annual return · n = years of child expenses
The child reserve assumes one payment per year, at the end of the year. Costs spread through the year would need a somewhat larger reserve.
Frequently asked questions
What is a financial freedom number?
It is the amount of investable money that could cover your family’s spending without a paycheck. This calculator builds it from three parts: the portfolio that funds ongoing living costs, a reserve for the limited number of years you support your children, and a reserve for one-time goals such as a home purchase or a healthcare buffer.
How much money does a family need to retire early?
The answer depends mostly on spending, not income. As an illustration: a household spending $6,000 a month, or $72,000 a year, would need a $1.8 million portfolio at a 4% withdrawal rate just for ongoing living costs — before any child-related or one-time reserves. Lower withdrawal rates require a larger portfolio.
What withdrawal rate should I use?
There is no universally safe withdrawal rate. The widely quoted 4% figure comes from historical US studies that assumed a 30-year retirement; longer retirements, early retirement and volatile markets all change the picture. This calculator lets you compare 2.5% to 5% and shows what each assumption does to your target instead of labelling one as safe.
Why do children get a separate line item?
Because child-related spending is temporary. Treating it as a permanent cost would inflate the target, so the calculator estimates the present value of the remaining years of child expenses and adds that as a separate reserve. Enter your monthly household expenses excluding child costs to avoid double counting. V1 assumes one payment per year at year end, so if you spend on children through the year the reserve would need to be somewhat larger.
Does this include Social Security, a pension, or my home?
No. The calculator only counts investable assets that you enter. Primary residence equity is excluded unless you would genuinely sell or borrow against it. Social Security, pensions, rental income and part-time work are not modelled in this version, so if you expect them your required portfolio may be lower than the estimate.
Why does the calculator use a real return instead of a nominal one?
All results are in today’s purchasing power. A real return is already net of inflation, so a 4% real return means 4% after inflation. Because the calculator works in today’s dollars, inflation is not subtracted a second time anywhere in the maths.
What if my assets already exceed the target?
Progress is capped at 100% and the calculator shows the surplus instead of a negative amount needed. Treat that as a signal to revisit the assumptions rather than a guarantee: spending tends to rise, and markets do not deliver a steady return.
Are my numbers stored or shared?
No. Every calculation runs locally in your browser. There is no account, no database, no financial account connection, and no analytics on the values you type. Results are only shared if you explicitly choose to copy or download them, and no personal inputs are placed in the page URL.
Financial disclaimer
This calculator provides illustrative estimates based on the assumptions you enter. Actual investment returns, inflation, taxes, healthcare costs and future spending may differ. The results are not a guarantee of financial independence and should not be considered personalized financial advice.
All figures are shown in today’s purchasing power and rely on simplified assumptions: a constant real return, a constant withdrawal rate, evenly spread child-related costs and no taxes. Real markets do not behave that way. Use the output as a starting point for a conversation, not as a plan.