Calculate return on investment, payback period, and annualised ROI for any project, campaign, or purchase. See your break-even month on a timeline — instantly.
Return on Investment (ROI) measures the efficiency of an investment. It tells you how much profit you made relative to the cost. ROI is used by businesses, marketers, and investors to evaluate whether an investment is worth making.
Use these benchmarks to compare your results against typical industry performance:
ROI works best alongside these business calculators:
→ Profit Margin Calculator — Calculate gross and net profit margins on your products and services.
→ Break-Even Calculator — Find the sales volume where an investment starts generating positive ROI.
→ Startup Cost Estimator — Plan all launch costs before calculating expected ROI on your new business.
→ Compound Interest Calculator — Compare investment ROI against compound interest savings returns.
Enter your investment amount and expected monthly return to see a month-by-month cumulative return table. The break-even month is highlighted in green.
| Month | Monthly Return | Cumulative Return | ROI % | Status |
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ROI — Return on Investment — is the most universally applied measure of financial performance in business. It answers a single, critical question: for every pound or dollar I spent, how much did I get back? The simplicity of the concept belies its power: ROI applies to marketing campaigns, equipment purchases, hiring decisions, software tools, training programmes, real estate, and any other deployment of capital.
A $5,000 investment that returns $7,500 has a net return of $2,500 and an ROI of 50%. If that return took 1 year, the annualised ROI is also 50%. If it took 2 years, the annualised ROI is approximately 22.5%. If it took 5 years, the annualised ROI drops to roughly 8.4%. Time changes everything — which is why annualised ROI is the more meaningful comparison metric when evaluating investments with different time horizons.
The payback period is the time until cumulative returns equal the initial investment — the exact point where the investment has fully paid for itself. Every return after that point is pure profit. For a $10,000 investment generating $2,000 per year: Payback Period = $10,000 / $2,000 = 5 years. For $1,500 per month: Payback = $10,000 / $1,500 = 6.7 months.
Shorter payback periods are always preferable — they return capital faster, reduce risk, and free up resources for the next investment. Most businesses target payback periods under 2–3 years for discretionary capital investments. The Break-Even Timeline above shows this month by month for any investment and return combination.
A 200% ROI sounds impressive — until you learn it took 20 years to achieve. Annualised ROI puts all investments on the same footing. The rule of thumb: for investments with different time horizons, always compare annualised ROI. For investments in the same time period, total ROI is sufficient. The most common mistake is comparing a short-term high total ROI against a long-term lower total ROI without annualising — which consistently leads to overvaluing quick-win investments and undervaluing long-term compounding ones.
ROI analysis applies to virtually every spending decision in a business. Here is how to think about it in the three most common contexts where it gets applied.
Marketing ROI = (Revenue Attributed to Campaign − Campaign Cost) / Campaign Cost × 100. If a £3,000 Google Ads campaign generates £12,000 in traced revenue, Marketing ROI = (£12,000 − £3,000) / £3,000 × 100 = 300%. A 3:1 return is a common minimum threshold for paid marketing — anything below that and you are likely better off reallocating the budget. Above 5:1 is considered strong for most channels.
The hardest part of marketing ROI is attribution — determining which revenue was actually caused by which campaign rather than coincidentally occurring at the same time. Consistent attribution models (last click, first click, linear, or data-driven), baseline comparison periods, and control groups all help get closer to the real number. Using gross profit rather than revenue as the return figure gives a more honest picture of true marketing ROI.
For physical equipment, software, or infrastructure: ROI = (Annual Benefit − Annual Cost) / Initial Investment × 100. Annual Benefit includes increased revenue, cost savings, or productivity gains. Annual Cost includes maintenance, licensing, and running costs. A £20,000 machine that saves £6,000 per year in labour costs (with £500 annual maintenance) has an annual net benefit of £5,500 and a first-year ROI of 27.5%. Payback period: £20,000 / £5,500 = 3.6 years.
Hiring ROI is often underestimated because it is harder to measure than marketing or equipment ROI. The cost side includes salary, employer payroll taxes (typically 13–20% of salary), recruitment fees (20–30% of first-year salary for agency hires), onboarding, training, and the management time consumed by a new hire. The return side is the incremental revenue or cost saving the hire generates above what was possible without them. A salesperson hired at £50,000 total package who generates £180,000 in new annual gross profit has a hiring ROI of roughly 260% — clearly positive. A hire who generates £60,000 in incremental benefit at £70,000 total cost is destroying value.
Every investment decision should be evaluated against your cost of capital — the rate at which you can borrow money or the return you could otherwise earn on the capital. If your business can borrow at 8% and a proposed investment returns 6% annualised ROI, it is destroying value even though it is technically profitable. Any investment with annualised ROI above your cost of capital creates value; below it destroys value. This is why high-growth companies with access to cheap capital can justify investments that would be unacceptable for businesses paying high interest rates on their debt.