Average Return Calculator: Understand Your Investment Performance

When evaluating how well an investment has performed over several years, a simple "arithmetic" average can be misleading. For example, if an investment goes up 50% one year and down 50% the next, the arithmetic average is 0%, but you have actually lost 25% of your money. Our Average Return Calculator uses the correct mathematical methods (Geometric Mean and CAGR) to show you your real growth.

Key Performance Indicators

1. Cumulative Return (Total ROI)

This is the total percentage change from your starting point to your ending point. It tells you exactly how much your capital grew or shrank in total.

2. Geometric Mean Return (CAGR)

The Compound Annual Growth Rate (CAGR) is the most accurate way to measure returns over time. It represents the smooth annual rate of return that would be required for an investment to grow from its starting balance to its ending balance, assuming the profits were reinvested at the end of each year.

3. Arithmetic vs. Geometric Average

• Arithmetic Average: The simple sum of returns divided by the number of periods. It's easy to calculate but often overstates the real performance of a volatile portfolio.
• Geometric Average: The "real" average that accounts for compounding and volatility. It is always lower than or equal to the arithmetic average.

How to Use This Tool

Mode 1: Cash Flows

Use this if you know your starting balance, your current balance, and how many years have passed. This is perfect for calculating the CAGR of a single stock holding or a property investment.

Mode 2: Multi-Period Returns

Use this if you have a list of annual returns (e.g., Year 1: +10%, Year 2: -5%, Year 3: +12%). Simply enter them separated by commas to see your combined performance.

Don't let simple averages fool you. Use our Average Return Calculator to see the real compounded performance of your investments today.