Question 1

What is a good ROI?

Accepted Answer

It depends on the investment type and time horizon. The S and P 500 averages 10% annual ROI over the long term, real estate 8-12%, REITs 7-10%, rental properties 6-12%, and high-yield bonds 4-6%. Venture capital targets 20-30% but with high risk. Generally, anything beating inflation (2-4%) is a positive real return, and 10%+ annualized is considered strong for most investors.

Question 2

Does ROI account for time?

Accepted Answer

Basic ROI does NOT account for time, which is a major limitation. A 50% ROI over 1 year is vastly different from 50% over 10 years. For time-adjusted returns, use annualized ROI: (Final/Initial)^(1/years) - 1. For complex cash flows with multiple investments and withdrawals, use IRR (Internal Rate of Return) or CAGR (Compound Annual Growth Rate).

Question 3

Can ROI be negative?

Accepted Answer

Yes. Negative ROI means you lost money. If you invested $10,000 and the final value is $8,000, ROI = ($8,000 - $10,000) / $10,000 = -20%. Negative ROI is common for risky investments in the short term. Even the S and P 500 has had years with -10% to -40% returns during market crashes, though long-term averages remain positive.

Question 4

What is the difference between ROI and ROAS?

Accepted Answer

ROI measures total return including all costs and is expressed as a percentage: (Profit / Cost) x 100. ROAS (Return on Ad Spend) only measures revenue generated from advertising divided by ad cost, typically expressed as a ratio: $5 of revenue for every $1 spent = 5:1 ROAS. ROAS ignores product costs, fulfillment, and overhead, making it useful for marketing teams but not for true profitability.

Question 5

How do I calculate ROI for a rental property?

Accepted Answer

For rental properties, use: (Annual Rental Income - Annual Expenses) / Total Investment x 100. Include mortgage interest, property taxes, insurance, maintenance, vacancy allowance (5-10%), and property management fees. A $200,000 rental generating $24,000/year gross, with $14,000 in expenses, produces $10,000 net profit. ROI = $10,000 / $200,000 = 5% cash-on-cash return. Add appreciation for total ROI.

Question 6

What is the difference between ROI and IRR?

Accepted Answer

ROI is a simple percentage of total return, while IRR (Internal Rate of Return) accounts for the time value of money and multiple cash flows. For a single investment with one return, ROI and annualized ROI work fine. For complex scenarios with varying contributions and withdrawals (like a rental property over 10 years), IRR provides a more accurate annualized rate. IRR is the discount rate that makes net present value equal zero.

ROI計算機

値を入力

結果

計算式

計算例

投資収益率（ROI）とは何ですか？

よくある質問

良いROIとは何ですか？

ROIは時間を考慮しますか？

ROIはマイナスになることがありますか？

関連する計算機

関連ガイド

Related Articles

How to Calculate ROI: Formula, Examples, and Free Calculator

Compound Interest Explained: How Your Money Grows Over Time

How to Calculate Profit Margin: Formula, Examples, and Mistakes

Markup vs Margin: What is the Difference and Why It Matters