ROI Explained: How to Calculate Return on Any Investment
ROI is the universal metric for whether something was worth the money. Here is how to calculate it for anything.
Return on Investment = (Gain - Cost) / Cost × 100. You spent $10,000 and got back $15,000. Gain: $5,000. ROI: $5,000 / $10,000 × 100 = 50%. This formula works for stocks, real estate, marketing campaigns, education, equipment purchases, and literally any expenditure that generates a return.
Why Annualized ROI Matters More
A 50% ROI over 1 year is spectacular. A 50% ROI over 10 years is mediocre (about 4.1% per year). Always annualize when comparing investments with different time horizons. The formula: ((Final Value / Initial Value) ^ (1/years) - 1) × 100. A college degree costing $80,000 that increases lifetime earnings by $1,000,000 over 40 years has an annualized ROI of about 6.5% — competitive with stock market returns, plus the non-financial benefits.