ROI Calculator

What ROI actually measures — and what it misses

Return on investment is the ratio of profit to cost, expressed as a percentage. It tells you how much you made relative to what you put in. A 50% ROI means for every dollar you invested, you made back $1.50 — your original dollar plus $0.50 profit.

What ROI doesn't tell you: how long it took. A 50% ROI over one year is exceptional. A 50% ROI over 20 years is roughly 2% annually — barely keeping pace with inflation. This is why annualized ROI (CAGR) matters for any comparison that involves different time periods.

The ROI formula

You bought stock for $3,000. It's now worth $4,200. ROI = ((4,200 − 3,000) ÷ 3,000) × 100 = 40%. You made 40% on your money. The calculator above handles any version of this.

For business ROI, net profit needs to include all costs: if a $10,000 marketing campaign generated $18,000 in revenue but the products sold cost $6,000, your net profit is $2,000 and your ROI is 20% — not 80%. Only counting revenue while ignoring costs is how most people overestimate their business returns.

Annualized ROI: comparing investments over different time periods

Comparing a 3-year investment to a 5-year investment by simple ROI is misleading. Annualized ROI (also called CAGR — Compound Annual Growth Rate) levels the playing field:

Investment A: $5,000 → $8,500 over 3 years. Simple ROI = 70%. Annualized = (8500/5000)^(1/3) − 1 = 19.3%/year.

Investment B: $5,000 → $11,000 over 6 years. Simple ROI = 120%. Annualized = (11000/5000)^(1/6) − 1 = 14.0%/year.

Investment A has a lower absolute return but a higher annual rate — it's the better performing investment per year invested. Simple ROI would make you think B is twice as good.

What counts as a good ROI?

It depends entirely on what you're comparing against and how much risk you're taking:

• Stock market (S&P 500 historical average): ~10% annually before inflation, ~7% real. This is your benchmark for passive investing.
• Real estate: Long-term total return (appreciation + rental income) averages 8–12% depending on market and how you measure it. Highly variable and location-dependent.
• Business investments: Need to substantially beat the stock market alternative to justify the added risk and effort. 20–40%+ is a meaningful threshold for many entrepreneurs.
• Marketing ROI: Industry benchmarks vary wildly. Email marketing typically shows 3,000–4,000% ROI (very high, low cost). Paid search averages 200–300%. Traditional advertising is often hard to measure at all.
• Home improvements: Most don't return 100% of cost at resale. Kitchen remodels average 60–80% return. Deck additions: 65–75%. Adding a bathroom: 50–60%. Curb appeal projects tend to return more per dollar than high-end interior upgrades.

ROI for business decisions

ROI works for evaluating any business investment: hiring a new employee, purchasing equipment, launching a new product, or running a marketing campaign. The key is making sure your cost and return figures are complete.

Hidden costs that often get omitted: staff time (calculate at hourly rate), opportunity cost (what else could that capital have done), integration/transition costs, and ongoing maintenance. Revenue projections tend to be optimistic; cost projections tend to be understated. A conservative estimate that still shows strong ROI is far more reliable than an aggressive one.

Payback period is sometimes more useful than ROI for business decisions — it tells you how long until you break even, which matters for cash flow planning. A $50,000 investment returning $15,000/year has a 3.3-year payback and a 30% annual ROI. Whether that's acceptable depends on your business's cash needs and growth stage.

Limitations of ROI

• Doesn't account for time: Addressed by annualizing, but raw ROI figures are often cited without this context.
• Doesn't account for risk: A 15% ROI from a Treasury bond and a 15% ROI from a startup investment are not equivalent. Risk-adjusted return (Sharpe ratio, for example) is the more complete metric for comparing investments.
• Ignores non-financial returns: Education ROI is often calculated by salary premium, which misses non-monetary benefits. A career change that pays 20% less but is far more satisfying might be the higher ROI decision by any reasonable measure of return.
• Easily manipulated: By selecting which costs to include and what revenue to attribute, ROI can be made to look almost anything. Always ask "what's included in the cost figure?" when someone presents an impressive ROI claim.