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IRA計算機

年間拠出額からIRA残高の成長を予測します。

はじめに

IRA Calculator — Project IRA balance growth from annual contributions. Enter Annual contribution, Expected return (%), Years, Annual limit to get an instant, accurate result.

計算式

Annual contribution is capped at the entered annual limit (default $7,000). Future value = contribution × [((1+r)ⁿ − 1)/r], the future-value-of-annuity formula applied annually.

ステップごとの説明

  1. Enter the Annual contribution.
  2. Enter the Expected return (%).
  3. Enter the Years.
  4. Enter the Annual limit.
  5. Click Calculate to see your result instantly.

実例

Example: With Annual contribution = 7000, Expected return (%) = 7, Years = 25, Annual limit = 7000, the IRA Calculator gives Future Value: 442743.264, Total Contributed: 175000, Annual Contribution Used: 7000.

よくある質問

Why is my contribution capped?
IRAs have an IRS annual contribution limit; the calculator will not project growth on contributions above the limit you specify.
Does this distinguish Traditional vs. Roth tax treatment?
No, this projects gross investment growth only — it does not model the tax deduction or tax-free withdrawal differences between account types.
What inputs does the IRA Calculator need?
You'll need to provide: Annual contribution, Expected return (%), Years, Annual limit. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the IRA Calculator?
The IRA Calculator applies the formula exactly as calculated — Annual contribution is capped at the entered annual limit (default $7,000). Future value = contribution × [((1+r)ⁿ − 1)/r], the future-value-of-annuity formula applied annually. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Are these results guaranteed?
No. The IRA Calculator gives an estimate based on the numbers you enter and standard financial formulas — actual rates, fees, taxes, and terms vary by lender, institution, and jurisdiction, and can change over time. This is not financial advice; consult a qualified financial professional for decisions specific to your situation.
Is the IRA Calculator free to use?
Yes, the IRA Calculator is completely free, requires no signup, and runs instantly in your browser.

IRA計算機について

The IRA Calculator uses a real, verifiable formula — Annual contribution is capped at the entered annual limit (default $7,000). Future value = contribution × [((1+r)ⁿ − 1)/r], the future-value-of-annuity formula applied annually. — so results are accurate every time, not an approximation.