Quick Answer
Your FIRE number is yearly spending divided by a withdrawal rate you choose. Spending S$40,000 a year at 4% gives S$1 million. With S$50,000 invested and S$2,000 a month at a 4% real return, a 30-year-old could reach it by about 53 (52 years and 7 months). The 4% rate is an assumption, not a guarantee.
The Useful Number: Spending S$40,000 a year at a 4% withdrawal rate gives a FIRE number of S$1 million. With S$50,000 invested and S$2,000 a month at a 4% real return, a 30-year-old could reach it by about 53 (52 years and 7 months).
What Is A FIRE Number?
FIRE stands for Financial Independence, Retire Early. Your FIRE number is the amount whose yearly withdrawal, at a rate you choose, covers your yearly spending: spending ÷ withdrawal rate. At 4%, S$40,000 a year needs S$1 million.
The 4% figure comes from studies of past US markets over 30-year retirements. It is an assumption, not a rule or a guarantee. A lower rate, such as 3.5%, gives a bigger number (about S$1.14 million here) and a later FIRE age.
When Could A 30-Year-Old Reach S$1 Million?
- FIRE number: S$40,000 ÷ 4%: S$1,000,000
- Invested today: S$50,000
- Invested each month: S$2,000
- Real return after inflation: 4% a year
- FIRE age: 52 years and 7 months, so 53 rounded up
- Coast FIRE age (retire at 65): 40
Coast FIRE means that after age 40, this person could stop adding money and growth alone could still reach S$1 million by 65. They would still need income for their spending until then.
- Yearly Spending: S$40,000
- Withdrawal Rate: 4%
- FIRE Number: S$1,000,000
- Coast FIRE Age (Retire At 65): 40
- FIRE Age: About 53
Data as of . Source: MoneySense — Investment Risk.
How Is This Different From The Retirement Number?
The Retirement Number calculator plans a set retirement age and life expectancy, raises spending with inflation and draws the money down to zero. It answers “how much do I need by my chosen age?”
The FIRE calculator works in today’s dollars with a steady withdrawal rate meant to last indefinitely. It answers “how soon could my investments cover my spending?” Neither counts CPF LIFE payouts, so for retirement income from CPF use the CPF LIFE estimator too.
What Does The Estimate Leave Out?
It assumes a steady real return every year, no fees or tax and spending that never changes. Bad markets early in retirement can make any withdrawal rate fail. It is not a check of retirement readiness.
What Can You Do Next?
Test a lower return and a lower withdrawal rate. See what your monthly amount could grow to in the compound growth calculator, and read the Retirement Number guide for a fuller retirement plan.
Quick Check
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Card 1 Of 3
Spending S$40,000 a year at a 4% withdrawal rate gives a FIRE number of S$1 million.
Card 2 Of 3
The 4% withdrawal rate is a guarantee that the money will last.
Card 3 Of 3
The FIRE calculator and the Retirement Number answer the same question.
Why?
The FIRE calculator asks how soon investments could cover your spending at a steady withdrawal rate.
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Open the calculator with this guide’s example filled in. Then change the numbers to match your situation.
Open FIRE Age Calculator →Frequently Asked Questions
What Is Coast FIRE?
It is the age after which you could stop adding money and growth alone could still reach your FIRE number by your chosen retirement age.
In the example, that is 40, for retirement at 65.
How Is The FIRE Calculator Different From The Retirement Number?
The Retirement Number plans a set retirement age and life expectancy and draws money down with inflation.
The FIRE calculator asks how soon investments could cover your spending at a steady withdrawal rate.
Is A 4% Withdrawal Rate Safe?
No rate is guaranteed.
The 4% figure comes from studies of past US markets over 30-year retirements. A lower rate, such as 3.5%, gives a bigger FIRE number.
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Sources & Assumptions
Sources checked 12 October 2026. These are examples only. Check the stated assumptions and limits before you use a result.
General information and estimates, not advice. The withdrawal rate is an assumption, not a guarantee. Assumes a steady real return with no fees or tax and leaves out CPF. Checked 4 October 2026.