I Want To Retire Today
Five numbers. One honest answer.
What this calculator does
This calculator estimates when you may reach financial independence based on your current age, invested assets, monthly investments, and expected retirement spending. It uses a compound growth model, the 4% rule, and Monte Carlo simulation to give you a complete picture of your retirement plan.
Who this is for
This tool is best for people pursuing FIRE (Financial Independence, Retire Early), Coast FIRE, or anyone exploring early retirement. It works well as a quick check to see whether your current savings rate puts you on track — or how far off you might be.
How the math works
Your projected savings at retirement are calculated using compound interest on your current assets plus monthly contributions. Your retirement target is set by dividing your annual expenses by the withdrawal rate (default: 4%). Monte Carlo simulation runs 1,000 scenarios with variable returns to estimate the probability your portfolio lasts 30 years.
Assumptions and limitations
The base calculation assumes a constant annual return. Monte Carlo uses a 15% standard deviation to model market volatility. The calculator does not account for inflation adjustments on expenses, healthcare costs, or changes in spending over time.
What is the 4% rule?
The 4% rule is a guideline from the Trinity Study suggesting that retirees can withdraw 4% of their portfolio annually with a high probability of the money lasting 30 years. To retire on $5,000 per month, you'd need $1.5M saved ($60K/year ÷ 4%). Adjust the withdrawal rate in the results view if you want a more or less conservative target.
Also try: Coast FIRE Calculator →
Find out how much you need invested today to stop saving and still retire on time.
FIRE guides
Retirement age guides
Frequently asked questions
How accurate is this calculator?
It gives a simplified estimate based on consistent returns and savings. Real returns vary year to year, and factors like taxes or unexpected expenses can change the outcome significantly.
What is FIRE?
FIRE stands for Financial Independence, Retire Early. The goal is to save and invest aggressively so you can live off investment returns instead of a salary — often well before traditional retirement age.
What if I have a pension or Social Security?
This calculator supports Social Security. After running the calculation, click "None" next to SS in the assumptions section to add your expected monthly benefit.
Can I change the assumed return rate?
Yes. After you run the calculation, click the return percentage in the results view to adjust it and see how different scenarios play out.
What is Coast FIRE?
Coast FIRE means you have enough invested that it will grow to your retirement goal on its own — so you can stop saving and just coast. Try the Coast FIRE calculator to find your number.
Sharpen your retirement plan
We're building historical backtesting, tax-aware projections, and more. Get early access — no spam, unsubscribe anytime.