FIRE Number by Age — How Much You Need at 30, 35, 40, 45, and 50 to Retire Early

Your FIRE number is based on expenses, not age. Someone spending $40,000/year needs $1,000,000 regardless of whether they are 28 or 48. But what you should have saved by a given age depends on when you want to retire and how aggressively you are saving.

This guide shows FIRE savings benchmarks by age, Coast FIRE numbers by age, and the math behind each.

FIRE Savings Benchmarks by Age

These assume $50,000/year expenses (Regular FIRE), 7% real return, 4% SWR, and a target retirement age of 45:

Age	Target Savings	% of FIRE Number	On Track If...
25	$30,000 - $60,000	2-5%	Just starting. Even $500/month invested is perfect.
28	$80,000 - $120,000	6-10%	Building momentum. 401k + IRA should be growing.
30	$130,000 - $200,000	10-16%	Hitting six figures invested. Savings rate above 30%.
33	$230,000 - $350,000	18-28%	Compound growth is becoming visible in your accounts.
35	$320,000 - $500,000	26-40%	Halfway to FIRE by dollars. Ahead of schedule if 40%+.
38	$480,000 - $700,000	38-56%	Compound growth is now doing serious work. Home stretch.
40	$650,000 - $900,000	52-72%	2-5 years out. Can see the finish line.
43	$900,000 - $1,100,000	72-88%	Almost there. Fine-tune withdrawal strategy.
45	$1,250,000	100%	FIRE. $50K/year at 4% withdrawal. Done.

Your numbers will be different based on your specific expenses, income, and returns. Run your scenario with your actual inputs.

Coast FIRE Numbers by Age

Coast FIRE is the amount you need invested today so that compound growth alone (no additional contributions) reaches your full FIRE number by age 60. Once you hit your Coast FIRE number, you only need to earn enough to cover current expenses — no more saving required.

Your Age	Coast FIRE Number*	Years to Compound	What It Means
25	$165,000	35 years	Save hard now, coast for 35 years. Very achievable for high earners.
28	$202,000	32 years	Three more years of growth needed. Still very doable.
30	$232,000	30 years	Popular Coast FIRE target. Many hit this by 30 with aggressive saving.
33	$284,000	27 years	Reduces but still has decades to compound.
35	$328,000	25 years	Sweet spot. Can switch to lower-stress work at 35.
38	$401,000	22 years	Tighter window but compound growth still does heavy lifting.
40	$463,000	20 years	Need a larger base. 20 years of 7% = 3.87x growth.
45	$616,000	15 years	Less compounding time. Base needs to be bigger.
50	$821,000	10 years	Only 10 years to compound. Need most of FIRE number already.

*Assumes $1,250,000 full FIRE number ($50K/year expenses at 4% SWR) and 7% real return. Formula: Coast FIRE = Full FIRE Number ÷ (1.07^years).

Coast FIRE at 30 means saving $232,000 by age 30, then never saving another dollar. Compound growth at 7% carries that $232,000 to $1,250,000 by age 60. You still work from 30 to 60, but only to cover current expenses — no pressure to save. This is why Coast FIRE is popular among people who love their work but hate the financial stress.

FIRE Number by Expense Level

Since your FIRE number is based on expenses, here is what different spending levels require:

Annual Expenses	FIRE Type	4% SWR Number	3.5% SWR Number
$25,000	Lean FIRE	$625,000	$714,286
$30,000	Lean FIRE	$750,000	$857,143
$40,000	Regular FIRE	$1,000,000	$1,142,857
$50,000	Regular FIRE	$1,250,000	$1,428,571
$60,000	Regular FIRE	$1,500,000	$1,714,286
$80,000	Fat FIRE	$2,000,000	$2,285,714
$100,000	Fat FIRE	$2,500,000	$2,857,143
$120,000	Fat FIRE	$3,000,000	$3,428,571
$150,000	Ultra Fat FIRE	$3,750,000	$4,285,714

The 3.5% SWR column is what most early retirees (retiring before 45) should target. A 40-year-old retiring needs their money to last 50+ years. The 4% rule was designed for 30-year retirements. Adding 0.5% extra safety costs 14% more savings but provides significantly more confidence for long retirements.

The Age Factor: Why Starting Early Matters So Much

Two people both want to hit $1,250,000 by age 45 with a 7% return:

Start Age	Years to Grow	Monthly Investment Needed	Total Contributed	Growth From Compounding
22	23 years	$1,550/mo	$428,000	$822,000 (66% of total)
25	20 years	$2,050/mo	$492,000	$758,000 (61%)
30	15 years	$3,350/mo	$603,000	$647,000 (52%)
35	10 years	$6,100/mo	$732,000	$518,000 (41%)
40	5 years	$14,700/mo	$882,000	$368,000 (29%)

Starting at 22, compounding does 66% of the work for you. Starting at 40, you are muscling 71% of it with raw contributions. This is why every FIRE blog emphasizes starting early — not because you need to save more total, but because compound growth needs time to work. Our compound interest calculator lets you model this exact effect.

Adjusting for Your Retirement Age

The benchmarks above target age 45 retirement. If your target is different:

• Retire at 40: You need to be 5 years ahead of the benchmarks. At 30, you should have what the table shows for age 35 (~$320K-500K).
• Retire at 50: You have 5 more years, which means you can be behind the benchmarks. At 35, having $200K-300K is fine for a 50-year retirement target.
• Retire at 55: Closer to traditional early retirement. The benchmarks are more relaxed, and you likely have access to 401k penalty-free withdrawals closer to your retirement date.

The FIRE calculator handles all these scenarios — enter your specifics and it projects your exact retirement year.