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Updated year criteria 2026
FIRE Number Calculator
The FIRE Number Calculator estimates a investment and time value estimate for your scenario from the quantities, rates, period, units and other assumptions requested on the page. Replace the example values with your own fire number figures and recalculate after changing an assumption. Use it to compare scenarios, then verify any current rate or fee before acting.
Calculate the FIRE Number, the target amount of money to be accumulated for early retirement, using the 4% Safe Withdrawal Rate rule, and estimate the time to FIRE from the current savings rate and return.
FIRE Number Calculation
FIRE Number
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Time to fire.
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Savings rate
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Progress to FIRE.0%
Annual expenses.-
Cashout Rate-
Current Net Worth-
Monthly savings.-
What is the FIRE Number and how is it calculated?
FIRE, Financial Independence, Retire Early, is a concept that aims to accumulate money to the point where the return on investment can cover lifetime expenses without working.
FIRE Number Formula
FIRE Number = Annual Expense ÷ Withdrawal Rate (%) × 100 Example: Expenditure 30,000 baht/month = 360,000 baht/year FIRE Number = 360,000 ÷ 4% = 9,000,000 baht
Time to fire.
Calculated from the future value of savings when money accumulates equal to the FIRE number, which depends on the current capital, monthly savings rate and return on investment. The more you save and the higher the investment yield, the shorter the time to FIRE.
Frequently asked questions
What's the FIRE Number?
The FIRE Number is the target amount of money to be accumulated for early retirement, based on the 4% (Safe Withdrawal Rate) rule, which states that you can withdraw 4% from a portfolio per year without exhausting the portfolio for life. Calculated from: FIRE Number = Annual Expense ÷ 0.04
Where's the 4% rule coming from?
The 4% rule comes from the Trinity Study in 1998 which found that withdrawing 4% per year from a portfolio invested in 60% equity/40% debt would leave money for at least 30 years in most cases. For FIRE that retires sooner, some use 3-3.5% for more safety.
How much savings do you need to fire fast?
The more you save, the faster you get to FIRE. If saving 10% takes about 40 years, saving 25% takes 32 years, saving 50% takes 17 years, and saving 75% takes just 7 years. The key is to reduce costs and increase revenue at the same time.
What should I invest in to earn the FIRE Number?
For FIRE in Thailand, prefer to invest in Index Funds both Thai and foreign LTF/RMF funds for tax deduction and SSF average long-term return is 6-8% per year recommended to spread risk and long-term investment
Check before using results
Summary before deciding
This calculation result is suitable for preliminary planning. Actual figures should be checked from documents or official sources before making important decisions.
The calculation is based on the information you enter on this page.
Special cases may require additional information.
It is recommended to record or compare the results with the related tools below.
Disclaimer: The results of the calculations are only estimates. Actual returns on investments may vary. They are not financial advice. Consult an expert before making investment decisions.
English calculator guide
How to use the FIRE Number Calculator
Use this page to test a specific fire number scenario. Enter your own values in the calculator above, review the units beside each field, and recalculate after changing an assumption. The result updates the fire number estimate instead of relying on a generic example.
Build a baseline fire number case with figures that match your situation.
Run a second fire number case after changing the rate, period, quantity or other key assumption.
Record the difference between the two fire number results and the input responsible for it.
Inputs for the fire number estimate
For this fire number calculation, check the quantities, rates, period, units and other assumptions requested on the page. The result is designed to show a investment and time value estimate for your scenario, not a guaranteed provider price or official decision.
How the fire number result is calculated
The calculator projects value over time from the entered amount, rate, period and contribution assumptions. Reusing the same fire number inputs will produce the same estimate, which makes the page suitable for controlled scenario comparisons.
Checks for a fire number decision
Confirm any current rate, threshold or provider rule that could change the final amount. For fire number, Use the result as a planning estimate and confirm any rate, rule or threshold that may have changed before acting. Check the important inputs and any current provider or authority rules before using the result for a decision.
Language QA
Terminology, numeric values and calculator controls checked
Review formula structure, test cases, data sources, effective dates, and risk language accordingly.How to check our · There is no claim that an outside professional reviewed it. Unless the page directly states the name and qualifications. This content is therefore not individual advice.
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