# Chubby FIRE Calculator

> See your chubby FIRE number for $80,000 to $150,000 a year of spending, the age your saving gets you there, and how chubby FIRE compares with fat FIRE.

Source: https://mycoastfire.com/chubby-fire-calculator
Last updated: 2026-09-29

Enter what you'd spend in a comfortable early retirement. You'll see your chubby FIRE number and the age your current saving gets you there.

## How the calculator works

Your chubby FIRE number is your yearly spending divided by your withdrawal rate. At the default of $100,000 a year and 4%, that’s $2,500,000. The calculator then grows what you have invested one month at a time at the real return, adds your monthly contribution, and stops in the first month the balance reaches the target. That month is your chubby FIRE age.

```
Chubby FIRE number = yearly spending ÷ withdrawal rate
real return        = (1 + expected return) ÷ (1 + inflation) − 1
```

Everything is in today’s dollars, so $100,000 means $100,000 of today’s buying power in whatever year you stop. It runs on the same engine as the [FIRE calculator](https://mycoastfire.com/fire-calculator). Only the starting numbers and the slider ranges are different.

## What counts as chubby FIRE?

Chubby FIRE means retiring early on an upper-middle-class budget: more than a typical FIRE plan allows, less than people mean by fat FIRE. Nobody owns the definition, and the ranges you’ll find don’t match. Ramit Sethi [puts chubby FIRE at $80,000 to $150,000 a year](https://www.iwillteachyoutoberich.com/chubbyfire/) of spending, with $2 million to $3.75 million invested. ProjectionLab’s glossary [uses $100,000 to $200,000](https://projectionlab.com/financial-terms/chubby-fire).

The calculator starts at $100,000 because that figure sits inside both ranges. It’s a convention, not a rule. If your household needs $92,000 a year to live the way you want, that’s your number, whatever anyone calls it.

## How do I pick a spending figure?

Start from what you actually spent over the last 12 months, not from a budget you wish you kept. Then adjust it for retirement. Take out the things that end when work does: retirement contributions, commuting, a mortgage that will be paid off, kids’ costs that will be over. Add the things that start. Health insurance is the big one before Medicare, and a chubby budget usually has more travel in it than a working year does.

The easiest way to underestimate is to leave out the lumpy costs: a new roof, a car every eight years, a parent who needs help. Spread those across the years and put them in. If the result is $108,000 rather than $100,000, the calculator will show you what that costs in years, and it’s better to find out now.

## A worked example

Colin and Farah are both 38. They have $600,000 invested, put away $7,500 a month between them, and want to keep spending about $100,000 a year after they stop working.

At 4%, their chubby FIRE number is $2,500,000. With 7% returns and 3% inflation, they reach it at 52. Here’s how much the budget moves that date when nothing else changes:

| Yearly spending | Target at 4% | Age they get there |
| --- | --- | --- |
| $60,000 | $1,500,000 | 45 |
| $80,000 | $2,000,000 | 49 |
| $100,000 | $2,500,000 | 52 |
| $125,000 | $3,125,000 | 55 |
| $150,000 | $3,750,000 | 58 |

Across the chubby range, each extra $25,000 a year adds $625,000 to the target and about three years of work for them. Going from a regular FIRE budget of $60,000 to $100,000 costs 7 years. That’s the price of the comfort, and I think it’s worth knowing before you commit to it.

## Chubby FIRE vs fat FIRE

The only difference is the spending line, and the line is blurry. Sethi describes fat FIRE as $100,000 to $300,000 or more a year, which swallows the top of his own chubby range. ProjectionLab starts fat FIRE at $200,000. The [fat FIRE calculator](https://mycoastfire.com/fat-fire-calculator) on this site opens at $120,000.

For a real household the gap shows up in years. If Colin and Farah wanted $200,000 a year, they’d need $5,000,000 and wouldn’t get there until 62, 10 years after their chubby date. A decade of work for double the budget is a trade some people will happily make. I’d make it only after writing down what the extra $100,000 a year would actually pay for. The [Coast FIRE vs. fat FIRE](https://mycoastfire.com/coast-fire-vs-fat-fire) page covers a different way to get there.

## Is 4% the right withdrawal rate?

For a retirement that might last 45 years or more, I’d at least look at 3.5%. At that rate Colin and Farah need $2,857,143, and their date moves from 52 to 53. That’s a cheap bit of insurance at their savings rate.

A bigger budget does help in one way. There’s usually more in it you could cut for a year or two after a bad market, and being able to spend less when the portfolio is down is real protection. The [4% rule calculator](https://mycoastfire.com/4-percent-rule-calculator) shows how long a portfolio lasts at different rates.

## Should taxes go into the spending figure?

Yes. The calculator treats whatever you enter as money the portfolio pays out, so it has to cover the tax on your withdrawals too. Withdrawals from traditional 401(k)s and IRAs count as taxable income, while [qualified Roth IRA distributions are tax-free](https://www.irs.gov/retirement-plans/roth-iras).

Suppose 15% of every dollar Colin and Farah withdraw went to tax. Keeping $100,000 would take $117,647 a year, the target would rise to $2,941,176, and their date would slip to 54. Your own rate depends on your account mix and your state, so treat 15% as an illustration.

## Where Coast FIRE fits

If chubby FIRE is more than a decade away, it helps to know when you pass the [Coast FIRE](https://mycoastfire.com/what-is-coast-fire) checkpoint: the balance that grows into your full target by a later age with no more contributions.

Say Colin and Farah would be fine retiring at 60 if the early date slipped. Their Coast FIRE number for that is $1,081,224 today, and at $7,500 a month they cross it at 44. From then on, $100,000 a year at 60 is covered even if they never save another dollar, and everything they invest is buying an earlier date. The [Coast FIRE calculator](https://mycoastfire.com/) will show you where you stand.

## What the calculator leaves out

It assumes the same return every year, which real markets never deliver. It leaves out Social Security, the [10% additional tax](https://www.irs.gov/taxtopics/tc558) on most retirement account withdrawals before 59½, and the cost of health insurance before Medicare at 65, which is a big line in a chubby budget. The [health insurance before 65](https://mycoastfire.com/blog/coast-fire-health-insurance-before-65) guide covers that part. It also keeps your spending flat in today’s dollars, when many people spend more in their first active years and less later on.

## Questions people ask

### How much do you need for chubby FIRE?

Your yearly spending divided by your withdrawal rate. At 4%, the $80,000 to $150,000 range people usually quote works out to $2 million to $3.75 million. At 3.5%, which I'd look at for a retirement that starts before 50, $100,000 a year needs about $2.86 million.

### What's the difference between chubby FIRE and fat FIRE?

Only the spending level, and nobody agrees on where the line is. Ramit Sethi describes chubby FIRE as $80,000 to $150,000 a year and fat FIRE as $100,000 to $300,000 or more, so his own ranges overlap. ProjectionLab starts fat FIRE at $200,000. Pick the budget you actually want and ignore the label.

### Is $2.5 million enough to retire early?

At a 4% withdrawal rate it supports $100,000 a year of spending, including tax. For a retirement that could last 45 years, a lower rate gives you more margin: at 3.5%, $2.5 million supports about $87,500 a year.

### Should my spending include taxes?

Yes. The calculator treats the figure you enter as money the portfolio has to pay out, so add the tax you expect on withdrawals. Traditional 401(k) and IRA withdrawals count as taxable income, while qualified Roth withdrawals are tax-free.

## Keep reading

-   [Fat FIRE calculatorThe same math for bigger budgets.](https://mycoastfire.com/fat-fire-calculator)
-   [FIRE calculatorAny spending level, starting at $60,000.](https://mycoastfire.com/fire-calculator)
-   [Types of FIRELean, fat, Coast and Barista side by side.](https://mycoastfire.com/fire-types)