How to Calculate Your Financial Freedom Number (Mine Got Smaller Twice)

For years “financial freedom” was a vibe for me, not a number. I knew I wanted it. I could not have told you what it cost.

Then I did the arithmetic, and the whole thing got a lot less mystical – and a lot more achievable, because I found out the number moves. Twice, in my case.

Standard disclaimer, and I mean it: none of this is financial advice. It’s the math I use on my own life. Run your own numbers and do your own research.

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Step 1: The Only Formula You Need

Your financial freedom number is your annual spending multiplied by 25.

That’s it. It comes from the idea that a diversified portfolio can historically support withdrawals of roughly 4% per year over a long retirement, and 4% is 1/25th. So 25 times your annual spending is the pile that theoretically covers your life without you working.

Concrete version. Say your household spends $4,000 a month:

• $4,000 x 12 = $48,000 a year
• $48,000 x 25 = $1,200,000

Notice what’s not in that formula: your income. Your number is built entirely from what you spend, not what you make. That was the first thing that rearranged my brain. A person earning $200,000 and spending $10,000 a month needs $3 million. A person earning $70,000 and spending $3,500 a month needs $1.05 million. Income buys you speed. Spending sets the finish line.

Step 2: Use Your Real Spending, Not Your Aspirational Spending

Here’s where most people accidentally lie to themselves, myself included the first time. I calculated my number off what I thought we spent. Then I pulled twelve months of actual statements – I use Empower to pull every account into one view now, though a bank export and a spreadsheet does the same job – and added the annual stuff people forget – insurance, car registration, the dentist, gifts, the one flight home a year.

My real number was noticeably higher than my imagined one. That was uncomfortable, and it was the single most useful hour of financial work I’ve ever done, because you can’t shrink a number you’re not looking at honestly. This is the same discipline behind spending guilt-free on purpose – you have to know the real figure before you can decide how you feel about it.

Take total spending for the last 12 months. Divide by 12. That’s your monthly. Use that.

Step 3: Subtract Income That Isn’t a Job

This is the lever nobody mentions, and it’s the one that shrank my number the most.

The 25x formula assumes your portfolio funds all of your spending. But it doesn’t have to. Any durable income that isn’t your job reduces what your portfolio has to cover – and because the multiplier is 25, every dollar of that income knocks 25 dollars off the target.

Back to the $48,000-a-year household. Say a small side business nets $1,500 a month – $18,000 a year:

• Portfolio now has to cover $48,000 – $18,000 = $30,000 a year
• $30,000 x 25 = $750,000

That $1,500 a month cut the finish line by $450,000. Not because the business is worth $450,000 – it isn’t – but because 25x turns modest recurring cash flow into an enormous reduction in what you need to accumulate.

That’s the entire reason I got into a physical cash-flow business in the first place. I ran the numbers on what vending machines actually make per month and realized a handful of well-placed machines was worth more to my freedom date than a much larger lump sum I’d have needed years to save. I eventually sold that business, and I’d still make the same decision to start it – the machines bought years, not just money.

Step 4: Notice That Your Expenses Are Geographic

The second thing that shrank my number: I moved.

Rent, healthcare, food, transportation – the four biggest lines in most budgets are all priced locally. The exact same life costs dramatically different amounts depending on where you live it. When your number is 25x your spending, cutting monthly spending by $1,000 cuts the target by $300,000.

That’s the real math behind geoarbitrage, and it’s a big part of why moving abroad turned out to be the best decision I ever made. I didn’t downgrade my life. I repriced it.

You don’t have to leave the country for this to apply. Moving one metro over, or one neighborhood over, does a scaled-down version of the same thing.

The Caveats, Because 25x Is a Finding, Not a Law

I’m not going to hand you a clean formula and pretend it’s physics. Things you should know:

4% came from studying 30-year retirements. If you’re planning to stop working at 40 and need the money to last 50+ years, that’s a longer horizon than the original research covered. Plenty of thoughtful people use 3.5% instead, which is 28.6x – on $48,000 a year that’s about $1.37 million rather than $1.2 million.

Taxes are real. A withdrawal isn’t the same as spendable cash. Depending on your accounts and your country, some of it goes to taxes, so your real spending need is higher than the sticker number.

Sequence of returns is the actual risk. A bad market in your first few years of withdrawing hurts far more than the same bad market ten years in, because you’re selling into weakness. This is why I keep cash and why I think about surviving financial winters as a separate problem from hitting the number.

Healthcare can wreck the model. It’s the single line item most likely to blow up a tidy calculation, especially before traditional retirement age. Price it honestly for your situation.

The Version I Actually Use

Here’s my working sequence, in order:

1. Pull 12 months of real spending. Divide by 12. That’s monthly.
2. Multiply by 12 for the annual figure. No fudging.
3. Subtract any non-job income I genuinely believe is durable. If I’d be embarrassed to defend it, it doesn’t count.
4. Multiply the remainder by 25. That’s the target.
5. Add a buffer for taxes and healthcare, because step 4 is optimistic.

What I like about this is that it gives you three separate levers instead of one. You can earn more and invest the difference. You can spend less, which cuts the target by 25x every dollar. Or you can build income outside your job, which also cuts it by 25x every dollar. Most people only ever pull the first lever, and it’s the slowest one.

The people I know who got there fastest pulled all three at once. That’s not a hack, it’s just leverage – and it’s a lot of why I keep writing about not depending on a single job for income.

Go Get Your Number

Twenty minutes with your bank statements and a calculator gets you a real figure instead of a feeling. It might be bigger than you hoped – mine was. But it’s a number you can attack from three directions, and that beats a vibe you can’t attack at all.

If you want the wider frame around it, I laid out how the whole path fits together in the five steps I actually followed and what the runway looks like in building a financial freedom runway.