Lean, Fat and Chubby FIRE: what each one costs

Lean FIRE means retiring early on a bare-bones budget, Fat FIRE means retiring on a comfortable, roomy one, and Chubby FIRE sits in between, a bit above a typical budget but short of lavish. Because your FIRE number is roughly 25 times your yearly spending, the budget you pick decides how much you need and how long it takes to get there.

There's no official line between them. They're labels people use online to describe a style of retirement, not rules.

This is general education, not financial advice. The budgets below are made up to show the math. Your number depends on where you live, your household and what matters to you.

The four sizes, with made-up numbers

| Style | What it often means | Made-up yearly spending | FIRE number (× 25) | |---|---|---|---| | Lean FIRE | Bare-bones: needs covered, few extras | $40,000 | $1,000,000 | | Regular FIRE | About how you live now, minus the paycheck | $60,000 | $1,500,000 | | Chubby FIRE | Comfortable, with room for travel and treats | $100,000 | $2,500,000 | | Fat FIRE | Roomy: more travel, giving and a big cushion | $150,000 | $3,750,000 |

The dollar figures are illustrations, not definitions. A Lean FIRE budget in a big, expensive city might look like a Chubby one somewhere cheaper. What matters is your own spending compared with your own life.

Lean FIRE: sooner, with less room

What it is: retiring on a budget that covers needs and not much more, often with a paid-off or low-cost home, simple travel and careful spending.

Why people choose it: it's the fastest way out of full-time work. A smaller number is reachable on a moderate income with a high savings rate.

The trade-off: there's little slack. A big medical bill, a car, a bad market or rising health insurance costs can push spending over plan. Many Lean FIRE plans lean on flexibility: part-time income, house-sharing or moving somewhere cheaper. Coast FIRE vs Barista FIRE covers using part-time income to make a lean plan sturdier.

Fat FIRE: later, with more room

What it is: retiring on a budget with plenty of room: travel, hobbies, helping family, giving, and a cushion so bad years don't force cuts.

Why people choose it: comfort and safety. A larger portfolio can ride out a rough start more easily, and spending can drop a lot before needs are threatened.

The trade-off: it takes more years of work and saving, usually on a high income. Some people find the extra years are worth it; others discover they'd rather have the time.

Chubby FIRE: the middle ground

What it is: a budget a bit above typical, with room for some travel and treats, but not the full Fat FIRE cushion.

Why people choose it: it balances the speed of Lean FIRE with the comfort of Fat FIRE. Many people who start out aiming for Lean FIRE end up here once they price in health insurance, family and the things they'd really miss.

How to pick the size that fits

1. Start from what you spend now. Track a few months, or use last year's bank and card statements.
2. Adjust for retirement. Some costs end (commuting, saving for retirement, maybe a mortgage). Others start or grow, especially health insurance before Medicare.
3. Split needs from wants. Your needs set your Lean number; your full budget sets your regular or Chubby number. Knowing both shows how much room you have to cut back in a bad year.
4. Price in taxes. Withdrawals from pre-tax accounts are taxed as income.
5. Decide what extra years of work are worth. The gap between Lean and Fat FIRE is often several years. Only you can say whether that time or that cushion matters more.

Common questions

What is the difference between Lean FIRE and Fat FIRE?

Lean FIRE means retiring early on a bare-bones budget, so you need less saved and get there sooner, with less room for surprises. Fat FIRE means retiring on a comfortable, roomy budget, which takes more saved and more time but leaves a bigger cushion.

What is Chubby FIRE?

Chubby FIRE sits between regular and Fat FIRE: a retirement budget a bit above typical, with room for travel and treats, but without the full cushion of Fat FIRE. It's an informal label, not an official level.

How much do you need for Fat FIRE?

There's no official figure. Multiply the yearly budget you have in mind by 25 for a 4% withdrawal rate. A made-up $150,000 a year would mean about $3.75 million. Your own number depends entirely on what you plan to spend.

How much do you need for Lean FIRE?

Again, it depends on your budget. A made-up Lean budget of $40,000 a year means about $1 million at 25 times spending. People in lower-cost areas, or with a paid-off home, may need less.

Is Lean FIRE risky?

It has less room for surprises, so a big bill or a bad market can force cuts. Many Lean FIRE plans add flexibility, such as part-time income, a lower withdrawal rate or a cheaper place to live, to make up for it.

Can I switch between Lean and Fat FIRE?

Yes. Plenty of people retire lean and spend more later as their portfolio grows or Social Security starts. Others aim for Fat FIRE and stop earlier once they realize a smaller budget is enough. The labels are a starting point, not a commitment.

Next step

Put in your own spending and see your number for Lean, regular and Fat FIRE side by side, with room for taxes and health costs.

Work out your FIRE number →