ROI Calculator

ROI formulas

• ROI % = (Net Profit ÷ Cost of Investment) × 100
• Net Profit = Final Value - Cost of Investment
• Annualized ROI = ((1 + ROI)^(1/years) - 1) × 100

What is a good ROI?

It depends entirely on the asset class and timeframe. The S&P 500 has historically returned ~10% annually. Real estate averages 8–12%. Marketing campaigns often target 5:1 ROI (400% return) as a minimum viable benchmark.

ROI vs annualized ROI

A total ROI of 100% over 10 years sounds impressive, but annualised it's only ~7.2% per year. Always compare investments using annualized ROI so timeframes don't distort the comparison.

Why ROI needs context

ROI is useful because it compresses cost and gain into one percentage, but that simplicity can hide important trade-offs. A 40% return in two months is very different from a 40% return over five years. A project with a lower ROI may still be better if it is safer, faster to recover cash, easier to repeat, or strategically important. Use ROI as a comparison tool, then review risk, timing, cash flow, and opportunity cost before making a decision.

Worked examples

If a campaign costs 1,000 and generates 5,000 in revenue, the gross-looking ROI is 400%. But if delivery costs, refunds, discounts, and staff time reduce profit to 2,000, the more realistic ROI is 100%. For a property project, the purchase price alone is not the full cost; fees, taxes, repairs, financing, and selling costs all belong in the investment base. For equipment, the return may include labour savings, extra production capacity, or avoided outsourcing rather than direct revenue.

Inputs to include in the cost

• Purchase or campaign spend: the obvious upfront investment.
• Fees and transaction costs: broker fees, platform fees, legal fees, payment charges, and taxes where relevant.
• Operating costs: maintenance, software, staff time, fulfilment, and support costs.
• Exit costs: selling fees, cleanup costs, cancellation charges, or disposal costs.

Common ROI mistakes

• Using revenue instead of profit: ROI should normally be based on net gain, not top-line sales.
• Ignoring time: compare annualized ROI when projects have different durations.
• Leaving out hidden costs: fees and internal labour can turn a strong-looking return into an ordinary one.
• Comparing different risks: a safe 8% and a speculative 20% are not interchangeable.

When payback period matters too

ROI tells you the percentage return, but it does not show how quickly cash comes back. A business with tight cash flow may prefer a lower ROI project that pays back in three months over a higher ROI project that locks up capital for years. For practical decisions, compare ROI with payback period, annualized return, and the risk that the expected benefit does not arrive.

ROI examples by use case

For a marketing campaign, include ad spend, creative work, landing page costs, discounts, fulfilment, and the gross margin on sales. For a software purchase, include licence fees, implementation time, training, and the value of hours saved. For a property improvement, include materials, labour, financing, fees, and the realistic uplift in rent or resale value. The formula stays the same, but the input discipline changes by use case.

How to compare two ROI options

Put both options on the same basis before choosing. If one project runs for six months and another runs for three years, compare annualized ROI. If one option is much riskier, compare the downside case as well as the expected case. If one option needs a large upfront spend, check whether the cash could be used elsewhere. A smaller, repeatable ROI can sometimes beat a larger one-off return because the capital comes back faster and can be redeployed.

Questions to ask before approving an investment

• Are all costs included, including internal time and ongoing support?
• Is the return based on revenue, profit, savings, or avoided cost?
• How long does it take to recover the original investment?
• What happens if the return is 25% lower than expected?
• Is there a simpler or lower-risk alternative with a similar result?

Before presenting ROI to a team

Show the assumptions beside the result. A clear ROI summary should state the investment cost, expected gain, timeframe, annualized return, payback period, and main risks. That helps stakeholders understand whether the number is conservative, optimistic, or dependent on assumptions that still need proof.

When ROI is the wrong primary metric

ROI is not always the best headline number. For very short projects, payback period and cash timing may matter more. For strategic projects, risk reduction, compliance, customer retention, or operational resilience may be the real benefit. Use ROI when the gain can be measured clearly, and use supporting metrics when the value is broader.

Related guides

• ROI Calculation Example - Property, stock, business, and side-hustle examples with annualized return and payback logic