Understanding how to calculate investment returns is essential for any investor. Whether you are evaluating a stock, mutual fund, or retirement portfolio, knowing your true return helps you make better decisions. This guide covers the three most important return calculations every investor should know.
The simplest way to measure investment performance is Return on Investment (ROI):
ROI = (Current Value - Cost) / Cost × 100%
If you invested $10,000 and it grew to $12,500, your ROI is ($12,500 - $10,000) / $10,000 × 100% = 25%. This works well for short-term investments but ignores the time factor.
CAGR measures the average annual growth rate of an investment over a specific period. It accounts for compounding and is the most common metric for comparing investments:
CAGR = (Ending Value / Beginning Value)^(1/n) - 1
Where n is the number of years. For example, if a $10,000 investment grew to $16,105 over 5 years: CAGR = ($16,105 / $10,000)^(1/5) - 1 = 10% per year.
Most investors contribute regularly rather than making a single lump sum. The formula for future value with monthly contributions is:
FV = P × ((1 + r)^n - 1) / r + PV × (1 + r)^n
Where P is the monthly contribution, r is the monthly rate, n is the number of months, and PV is the initial investment.
Manual calculations are error-prone, especially when dealing with compounding, taxes, and inflation. Our free investment calculator handles all these factors automatically, letting you compare scenarios like different contribution amounts, rates of return, and time horizons in seconds.
Ready to calculate your investment returns? Try our investment calculator for free, or explore our compound interest calculator to see how your money grows over time.