Business Term
ROI
Return on Investment
ROI
ROI measures investment efficiency by comparing return with the cost invested.
Formula
ROI = (gain from investment - investment cost) / investment cost
Use when
Use it to compare ads, hiring, systems, or improvement initiatives.
Watch out
Investment cost, direct gain, period, required operating cost
Updated: 06/27/2026Quality: ReviewedSources: 1
What it means
ROI compares initiatives or investments on a shared basis. Period, cost scope, return definition, and risk must be aligned.
How to calculate it
| Lens | Formula / treatment | When to use it |
|---|---|---|
| Basic formula | ROI = (gain from investment - investment cost) / investment cost | Measures investment efficiency |
What counts / what does not
| Item | Treatment | Why it matters |
|---|---|---|
| Include | Investment cost, direct gain, period, required operating cost | They define efficiency |
| Exclude | Unsupported future benefits, other initiatives' gains, unrecoverable assumptions | They overstate return |
What moves the number
| Driver | Metric impact | What to watch |
|---|---|---|
| Profit gain / cost reduction | Increases numerator | Raises ROI |
| Investment cost / payback period | Denominator and time risk | Drives decision quality |
When it helps
- Use it to compare ads, hiring, systems, or improvement initiatives.
How to use it
- Compare alternatives with the same period, cost scope, and return definition.
Decision cautions
- High ROI still needs checks for scale, payback timing, and risk.
Example
Example: investing 1 million yen and gaining 1.3 million yen gives 30% ROI.
Compare with
| Metric | Difference | Why read together |
|---|---|---|
| CAC | Customer acquisition cost | ROI measures broader investment efficiency |
| Cash Flow | Cash movement | ROI is an efficiency ratio |
Common mistakes
- Using only easy short-term gains can miss long-term risk and quality loss.
Frequently asked questions
Can ROI alone decide an investment?
No. Also check payback, risk, cash flow, and strategic importance.
Sources
| Sources | Kind | Link |
|---|---|---|
| YogoQ Core business foundation editorial baseline | editorial | — |