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すべての計算機 お気に入り ()
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金利計算機

元本、最終金額、期間から単利または複利の金利を計算します。

はじめに

Interest Rate Calculator — Solve for the simple or compound interest rate given principal, final amount, and time. Enter Principal, Final amount, Years, Mode to get an instant, accurate result.

計算式

Compound mode: rate = ((final amount / principal)^(1/years) − 1) × 100. Simple mode: rate = ((final amount / principal) − 1) / years × 100.

ステップごとの説明

  1. Enter the Principal.
  2. Enter the Final amount.
  3. Enter the Years.
  4. Enter the Mode.
  5. Click Calculate to see your result instantly.

実例

Example: With Principal = 10000, Final amount = 15000, Years = 5, Mode = compound, the Interest Rate Calculator gives Rate Pct: 8.4472, Mode: compound.

よくある質問

Which mode should I use?
Use compound if interest is reinvested/compounded over the period; use simple if interest is calculated only on the original principal each year.
Can the result be negative?
Yes — if the final amount is less than the principal, the implied rate is negative, indicating a loss.
What inputs does the Interest Rate Calculator need?
You'll need to provide: Principal, Final amount, Years, Mode. 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 Interest Rate Calculator?
The Interest Rate Calculator applies the formula exactly as calculated — Compound mode: rate = ((final amount / principal)^(1/years) − 1) × 100. Simple mode: rate = ((final amount / principal) − 1) / years × 100. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Are these results guaranteed?
No. The Interest Rate 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 Interest Rate Calculator free to use?
Yes, the Interest Rate Calculator is completely free, requires no signup, and runs instantly in your browser.

金利計算機について

The Interest Rate Calculator uses a real, verifiable formula — Compound mode: rate = ((final amount / principal)^(1/years) − 1) × 100. Simple mode: rate = ((final amount / principal) − 1) / years × 100. — so results are accurate every time, not an approximation.