ROI & Break-even Calculator

Return on Investment (ROI) is one of the most important metrics for evaluating the profitability of an investment. It measures the gain or loss generated relative to the amount invested, expressed as a percentage.

The Basic ROI Formula

The simplest ROI calculation compares your net profit to your initial investment:

When to Use Total ROI

Total ROI is useful for:

• Comparing the overall profitability of different completed investments
• Evaluating projects with similar timeframes
• Quick assessment of whether an investment was worthwhile

However, total ROI does not account for time. A 50% return over 1 year is very different from 50% over 10 years. This is where annualized returns become important.

Compound Annual Growth Rate (CAGR) tells you what your investment would have grown at if it had grown at a steady rate each year. This makes it easy to compare investments of different lengths.

The CAGR Formula

Why CAGR Matters

CAGR allows you to make apples-to-apples comparisons:

• Investment A: 100% total return over 5 years = 14.9% CAGR
• Investment B: 50% total return over 2 years = 22.5% CAGR

Even though Investment A had a higher total return, Investment B was actually more efficient on an annual basis. This helps you evaluate whether to continue holding an investment or redirect that capital elsewhere.

Benchmark Returns

When evaluating your CAGR, compare it to common benchmarks:

• ASX 200 historical average: ~9-10% per year
• S&P 500 historical average: ~10-11% per year
• High-yield savings accounts: 4-5% per year
• Term deposits: 4-5% per year

The break-even point is where your total revenue equals your total costs — you are not making a profit, but you are not losing money either. Understanding this number is crucial for pricing decisions and business planning.

Understanding Costs

To calculate break-even, you need to separate your costs into two categories:

• Fixed Costs: Expenses that stay the same regardless of sales volume (rent, salaries, insurance, loan payments, subscriptions)
• Variable Costs: Expenses that change with each unit sold (materials, shipping, sales commissions, payment processing fees)

The Break-even Formula

Using Break-even Analysis

Break-even analysis helps you answer critical business questions:

• How many sales do I need to cover my costs?
• What happens if I raise or lower my prices?
• Can I afford to hire another employee (increasing fixed costs)?
• How does a bulk discount from suppliers affect profitability?
• What is my margin of safety? (How far above break-even am I?)

Practical Applications

For Investors

• Track ROI across all your investments to identify your best and worst performers
• Use CAGR to compare investments with different holding periods fairly
• Include all income (dividends, distributions) for accurate total return
• Factor in fees and taxes for a true picture of net returns

For Business Owners

• Calculate break-even before launching a new product or service
• Re-evaluate when costs change (rent increase, supplier price changes)
• Use break-even to set realistic sales targets for your team
• Consider multiple scenarios: best case, worst case, and most likely