What Is ROI?
ROI (Return on Investment) is a simple way to measure how profitable an investment is. It shows how much profit you make compared to the amount you invested.
ROI is used in business, marketing, property, and personal finance to compare different opportunities and decide whether something is worth doing.
---ROI Formula
The basic ROI formula is:
ROI (%) = (Profit ÷ Investment Cost) × 100
Where:
- Profit = Final value − initial investment
- Investment cost = amount you originally spent
How to Calculate ROI Step by Step
Example 1: Simple ROI Calculation
You invest £1,000 in a project and earn £1,300 back.
Step 1: Calculate profit.
Profit = £1,300 − £1,000 = £300
Step 2: Apply the formula.
ROI = (300 ÷ 1,000) × 100 = 30%
Your ROI is 30%.
---Example 2: Marketing ROI
You spend £500 on ads and generate £1,200 in revenue.
Profit = £1,200 − £500 = £700
ROI = (700 ÷ 500) × 100 = 140%
This means your marketing campaign returned more than double your investment.
---What Is a Good ROI?
A “good” ROI depends on the type of investment:
- 5–10% may be good for long-term investments
- 20%+ is strong for business activities
- 100%+ can happen in high-risk or high-return scenarios
ROI should always be compared within the same type of investment.
---Why ROI Matters
ROI helps you:
- Compare different investments
- Measure business performance
- Decide where to spend money
- Identify profitable opportunities
- Avoid wasting resources
Limitations of ROI
ROI is useful, but it has limitations:
- It does not account for time
- It ignores risk
- It may not include all costs
For example, a 50% return over 5 years is very different from 50% in 1 year.
---ROI vs Profit
Profit is the amount of money gained.
ROI is the percentage return relative to the investment.
Example:
- Profit = £500
- Investment = £1,000
- ROI = 50%
Use the ROI Calculator
To calculate ROI instantly, use our ROI Calculator.
You can also use the Profit Margin Calculator to measure profitability, or the Percentage Calculator for quick percentage calculations.
---Common ROI Mistakes
Ignoring Costs
Always include all costs, not just the obvious ones.
Confusing Revenue with Profit
ROI is based on profit, not total revenue.
Not Comparing Timeframes
Returns should be compared over similar time periods.
---Frequently Asked Questions
What is ROI?
ROI measures how much profit you make compared to your investment.
What is the ROI formula?
ROI = (Profit ÷ Investment) × 100.
Why is ROI important?
It helps you compare investments and make better financial decisions.
Can ROI be negative?
Yes. If you lose money, ROI will be negative.
---Conclusion
ROI is one of the simplest and most useful financial metrics. It shows how efficiently your money is being used and helps guide better decisions.
Once you understand the formula, calculating ROI becomes quick and straightforward. For faster results, use the ROI Calculator.