Question 1

How do I calculate return on investment?

Accepted Answer

ROI = (final value − amount invested) ÷ amount invested × 100. If you invest $10,000 and it grows to $13,500, your ROI is 35%.

Question 2

What is annualized return?

Accepted Answer

Annualized return spreads the total gain evenly across the years held: (final ÷ invested)^(1/years) − 1. It lets you compare investments of different lengths on equal footing.

Question 3

Is a higher ROI always better?

Accepted Answer

Not on its own — a high ROI over many years can be worse than a modest one over a short period. Check the annualized return and consider the risk taken to earn it.

Question 4

Does ROI account for fees and taxes?

Accepted Answer

This basic calculation doesn't. For a true picture, use the net amount after fees and taxes as your final value so the ROI reflects what you actually keep.

ROI（投資収益率）計算ツール

残高の推移

Lumi で実際に管理しよう

よくある質問

他の計算ツール