Some More Simple Math of FIRE

It’s Friday, and we love Fridays, right?

Why?

Because as kids, Friday was the day we were released from the rigid (to me, prison like) structure of school for the weekend.

And for many of us, that pattern continued into adulthood once we moved from part-time jobs into “professional,” “administrative,” or “operational” careers built around the standard Monday-through-Friday schedule.

Ah yes!
Two whole days that are supposedly ours.
And if you can sneak out a little early on Friday afternoon, Even better!

Friday = Pure bliss.

But let’s look at this from a different angle.

Did you know that many modern workers actually spend more days working each year than people commonly did before the Industrial Revolution?

Before around 1700, most people worked the land in agricultural societies. Estimates vary, but many historians believe the average worker may have worked roughly 160 days per year.

Today, many full-time workers are effectively committed to around 240 working days annually.

The simple math is this:

Before the technological advances of the Industrial Revolution, people often had more than 200 days per year available for non-work life.

Today, the standard worker may only have around 125 truly “free” days per year.

That’s roughly a 75-day difference.

And it gets more interesting.

Pre-industrial work also tended to be highly seasonal. During planting and harvest periods, people might work extremely long days. But during slower seasons, work hours dropped dramatically.

Some estimates place annual labor at roughly 1,400 hours per year.

Compare that to modern work life.

A standard full-time schedule alone runs close to 1,950 hours annually, and when commuting is added in, many people are effectively spending 2,100–2,200 hours per year attached to work.

Splitting the difference, let’s call it roughly 2,080 hours annually.

Now obviously, modern life comes with advantages people in the 1600s did not have.

We have modern medicine, some helpful technology, climate control, faster transportation (is this good? It can be), greater safety in many respects, and access to opportunities unimaginable in earlier eras.

Still, I think the comparison raises an interesting question:

What would life feel like if you truly worked only half the year and had the remaining half available for other pursuits?

Would you enjoy life more?

And then let’s push the thought experiment even further.

What if you reached FIRE and work became optional altogether?

At that point, all 365 days of the year become yours to direct.
All 168 hours each week become yours to allocate.

That does not mean you stop working entirely, necessarily.
But it does mean your relationship to work fundamentally changes.

Now, would everyone actually want complete freedom from structured work?

Probably not.

Some people are likely happier with Barista FIRE or Coast FIRE arrangements where meaningful work remains part of life, but with dramatically increased autonomy and flexibility.

And, I completely understand that perspective. I like staying engaged in “work” (like writing this blog, for example).

There was a famous 2010 study suggesting that happiness did not increase significantly beyond roughly $75,000 per yearin income.

More recent research has complicated that conclusion somewhat. Higher income does appear to correlate with somewhat greater life satisfaction, but the increases are far smaller than many people assume.

The simple math looks something like this:

People earning below roughly $50,000 per year reported average life satisfaction around 4.0 out of 7.

Middle-income earners in the roughly $75,000–$100,000 range reported around 4.6 out of 7.

Ultra-high earners and multimillionaires averaged closer to 5.5 out of 7.

In other words:

More money helps, but it does not magically transform your life.

Why does additional money help?

Mostly because it tends to bring:

• greater control over time and lifestyle

• more flexibility in career choices

• less day-to-day logistical stress

• greater peace of mind

Having experienced both Lean FIRE and full FIRE myself, I can absolutely say I noticed these differences.

When I first reached Lean FIRE level financial status back in 2015, but continued working, I noticed my overall stress levels decrease substantially. My sense of optionality increased. My decisions felt less fear-based.

And that was fantastic.

But here is some more simple math that I think is important:

Other areas of life often impact life satisfaction more than income increases do.

For example, some studies suggest doubling your income may only increase life satisfaction modestly, about .2 percent.

Meanwhile:

• a major health crisis can dramatically reduce life satisfaction (-.7)

• unemployment can sharply reduce it as well (-.7)

• strong relationships and meaningful social connection significantly increase it (+.6)

And this is where pursuing FIRE becomes particularly important to consider.

FIRE itself does not magically create happiness.

But it likely provides greater capacity to invest in things that matter most to you:
health,
relationships,
rest,
creative pursuits,
freedom,
and alignment.

For example, FIRE gives you more time and energy to attend to your health and fitness.

It also reduces the existential stress tied to job loss because you no longer depend entirely on a paycheck to survive.

Relationships are more complicated.

Work absolutely can provide meaningful friendships, camaraderie, and social structure. I genuinely miss some of those aspects from my corporate years.

But difficult work environments and unhealthy relationships can also deeply diminish life satisfaction.

So in my own “simple math brain,” work relationships can sometimes end up being a wash overall.

Here’s another interesting piece of simple math to consider:

People living in lower-cost-of-living areas often report life satisfaction levels similar to much higher earners living in more expensive metropolitan areas.

Someone earning around $54,000 annually in a lower-cost region may report life satisfaction comparable to someone earning substantially more in a high-cost city.

And that matters enormously for the savings rate required for you to reach FIRE.

Using a 5% withdrawal rate, the difference between needing $100,000 annually versus $54,000 annually is roughly the difference between needing around a $2 million portfolio versus closer to $1 million.

That seems much more doable, doesn’t it?

Interestingly, lower-cost areas are often smaller cities or towns, and people frequently report greater overall life satisfaction in those environments as well.

Anyway, that’s enough simple math for one Friday morning.

But perhaps it gives you a few things to think about before the Sunday Scaries roll back around in a couple days.