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FIRE Calculator

Calculate assets and timeline for FIRE (Financial Independence, Retire Early). Features 4% rule safety indicator, NISA tax-free benefits, pension impact, and asset growth chart.

Last updated: 2026/10/16 Finance Feedback & bug reports
Standard FIRE Average lifestyle
yrs
yrs
JPY
JPY/mo
%
Reference rates
JPY/mo
%
%
yrs
Pension Settings
Include pension income
Side FIRE Settings
Include Side FIRE (side income)
Safety (Trinity Study)
Asset Growth Chart
Yearly Breakdown
Age Annual Invest/Withdraw Gain Annual Expenses Pension Balance

This tool provides estimates only and does not guarantee actual investment results.

Taxable accounts are calculated at 20.315% tax rate. The reconstruction tax applies through the end of 2037.

Pension amounts are approximate inputs. Check your actual pension statement for accurate figures.

Investments involve risk. All investment decisions are your own responsibility.

This tool is for general informational purposes only and is not a solicitation for any financial product or individual investment advice.

JPY/mo
%
FIRE Target Amount
6,000万円
Withdrawal Rate Required Assets Monthly Withdrawal

This tool provides estimates only and does not guarantee actual investment results.

Investments involve risk. All investment decisions are your own responsibility.

How to Use

1

Enter Basic Info

Set your current age, assets, monthly investment, and expected return rate.

2

Set Post-FIRE Expenses

Enter monthly living expenses and withdrawal rate after retirement (4% rule is default).

3

Review Results

Check FIRE timeline, required assets, and asset growth chart. Adjust parameters to explore scenarios.

About FIRE Calculator

A tool that calculates assets needed and timeline for achieving FIRE (Financial Independence, Retire Early). Features 4% rule withdrawal simulation, NISA tax-free benefit visualization, pension impact analysis, all adapted for Japan's financial system.

For a deeper look at how much you need, see our FIRE target amount guide. To model wealth building, try the Compound Interest Calculator and NISA Calculator, and use the Savings Goal Calculator to work backward from a target.

Features

  • 4% Rule SupportWithdrawal rate based on Trinity Study with safety indicator.
  • NISA Tax-Free BenefitsAutomatic comparison between NISA and taxed accounts.
  • Pension SimulationAsset lifespan calculation considering pension income after 65.
  • Real-time Asset ChartVisualize asset trajectory from accumulation through withdrawal phase.

Use Cases

  • Estimate how much you need for FIRE
  • Calculate when you can FIRE with current savings rate
  • Plan FIRE strategy using NISA
  • Check how long assets last after retirement
  • Verify 4% rule safety with your own conditions

FAQ

What is FIRE?
FIRE (Financial Independence, Retire Early) is a lifestyle strategy focused on building enough assets to live off investment returns without depending on employment income.
What is the 4% rule?
The 4% rule, based on the Trinity Study, suggests that withdrawing 4% of your portfolio annually gives a 95%+ probability of not running out of money over 30 years. This means you need 25x your annual expenses.
How much do I need for FIRE?
Using the 4% rule, you need 25x your annual expenses. For example, 200,000 JPY/month (2.4M/year) requires 60M JPY. Use the Reverse tab for quick calculations.
How accurate is this simulator?
It uses constant return and inflation assumptions. Real markets fluctuate. We recommend conservative estimates (lower returns, higher inflation) for more realistic planning.
How does NISA affect FIRE?
NISA accounts provide tax-free investment gains, accelerating wealth accumulation compared to taxed accounts. This tool shows the concrete difference.
Why consider inflation?
At 2% inflation, living costs increase ~22% in 10 years and ~49% in 20 years. For long retirement periods, inflation significantly impacts asset longevity.
How does pension affect FIRE calculations?
Pension income reduces the amount you need to withdraw from savings, significantly extending asset lifespan. This tool lets you simulate the impact.
What withdrawal rate is safe?
The Trinity Study suggests 4% or less is safe. Below 3% gives 95%+ success rate. In Japan's low-interest environment, 3.5% may be more conservative.
What is Coast FIRE / Barista FIRE?
These are partial FIRE strategies where you cover part of expenses with part-time work, requiring less savings. Simulate by setting lower monthly expenses in this tool.
Is my data safe?
Yes, all calculations run entirely in your browser. No data is sent to any server.
How much less do I need with Side FIRE (side income)?
Side income covers part of your expenses, lowering the assets you need. For example, if 50,000 JPY of a 200,000 JPY/month budget comes from side work, withdrawals only need to cover 150,000 JPY/month (1.8M/year), reducing the 4% rule target from 60M to 45M JPY. Set the monthly side income and the age it lasts until in the Side FIRE settings.
How are the years to FIRE calculated?
We compound your current assets with monthly contributions and the expected return each year until they reach the FIRE target (annual expenses / withdrawal rate). Enabling Side FIRE lowers the target, so the years to FIRE decrease. These are estimates based on a constant return and are not investment advice.

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