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Return on Investment (ROI)

$$\text{ROI} = \frac{\text{Final Value} - \text{Initial Cost}}{\text{Initial Cost}} \times 100$$

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What is Return on Investment (ROI)?

Return on Investment (ROI) measures how much an investment gains or loses relative to its cost. It is calculated by subtracting the initial cost from the final value, dividing by the initial cost, and multiplying by 100 to express the result as a percentage. A positive ROI means the investment was profitable; a negative ROI means it lost money.

ROI's power lies in its universality: it reduces any investment - a stock purchase, a marketing campaign, a factory machine, or a new hire - to a single comparable percentage. A marketing campaign that cost $10,000 and generated $40,000 in attributable revenue has an ROI of 300%, making it directly comparable to a $50,000 equipment upgrade that saves $15,000 per year (30% annual ROI).

The main limitation of simple ROI is that it ignores time. An ROI of 50% is excellent in one year but mediocre over a decade. For multi-year investments, CAGR (Compound Annual Growth Rate) is the more useful companion metric, as it converts total ROI into an annualised rate that accounts for the time value of money.

When to use Return on Investment (ROI)

Use ROI as a first-pass filter to compare mutually exclusive investments or marketing channels. Pair it with CAGR for any investment spanning more than one year. Do not use standalone ROI to compare investments with very different time horizons without also computing the annualised rate.

Worked examples for Return on Investment (ROI)

This table quickly gives you the overview you need to understand Return on Investment (ROI) and its most important comparisons.

Investment	Initial Cost	Final Value	Net Return	ROI
Stock purchase	$10,000	$14,500	$4,500	45%
Marketing campaign	$5,000	$18,000	$13,000	260%
Equipment upgrade	$80,000	$95,000	$15,000	18.75%
Failed product launch	$25,000	$12,000	−$13,000	−52%

Common pitfalls

ROI is easily manipulated by choosing what counts as "cost" or "return." A marketing ROI calculation that includes only ad spend but ignores agency fees, creative production, and staff time will be significantly inflated. Always use fully-loaded costs. For capital investments, also compare ROI against the company's weighted average cost of capital (WACC) - a 10% ROI is not attractive if the company's cost of capital is 12%.

Frequently asked questions about Return on Investment (ROI)

What is a good ROI?

There is no universal benchmark - it depends on the investment type, risk level, and time horizon. Stock market investors historically target 7–10% annualised (inflation-adjusted). Marketing campaigns are often evaluated against a minimum 3:1 return ($3 return per $1 spent, i.e., 200% ROI). The only valid comparison is against the opportunity cost: what else could the capital have earned?

What is the difference between ROI and CAGR?

ROI measures total return over the full investment period regardless of length. CAGR converts that total return into an equivalent annual rate, enabling fair comparison across investments held for different periods. A 100% ROI over 2 years equals a CAGR of approximately 41.4%; the same 100% ROI over 5 years equals a CAGR of 14.9%.

How does ROI differ from ROE?

ROI is a general-purpose investment return metric that applies to any asset. ROE (Return on Equity) is a specific corporate finance metric comparing net income to shareholders' equity - it measures management's efficiency in using owner capital. A company's overall ROE informs investors; project-level ROI informs internal capital allocation decisions.

Test your knowledge

Quiz: how well do you know ROI?

5 questions · ~2 min

1. What does Return on Investment (ROI) measure?

ℹ ROI measures how much an investment gains or loses relative to its cost, calculated as (Final Value - Initial Cost) / Initial Cost x 100. A positive ROI means the investment was profitable; a negative ROI means it lost money.

2. Why is CAGR a better companion metric than standalone ROI for multi-year investments?

ℹ The definition states that ROI ignores time - a 50% ROI is excellent in one year but mediocre over a decade. CAGR converts total ROI into an annualised rate that accounts for the time value of money, making multi-year comparisons meaningful.

3. From the examples table, which investment generated the highest ROI?

ℹ The marketing campaign at 260% ROI is the highest in the table. Despite having the smallest absolute dollar gain ($13,000), it produced the greatest return relative to its cost ($5,000 invested).

4. The pitfalls section warns that a 10% ROI may not be attractive. Under what condition?

ℹ The pitfalls section states that "a 10% ROI is not attractive if the company's cost of capital is 12%." ROI must always be compared against WACC - it only creates value if it exceeds the cost of the capital deployed.

5. According to the FAQ, what is the only valid benchmark for evaluating whether an ROI is good?

ℹ The FAQ states "the only valid comparison is against the opportunity cost: what else could the capital have earned?" There is no universal ROI benchmark - the right reference is always what the alternative use of capital would have returned.