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ROI Calculator
Calculate your return on investment, net profit, and payback period. Free ROI calculator for business and startup decisions.
Benchmark fit
Is your result healthy for your specific business model, not just positive?
Sensitivity
Which single input, if wrong, would change the result most?
Time horizon
Does this hold up over 12 months, or only at today's volume?
Next decision
What should change in the business because of this number?
ROI is the simplest test of whether a specific spend — a marketing campaign, a piece of equipment, a hire — was worth it. This calculator projects net profit and payback period from an expected monthly return.
Use it before committing capital, not just after, to set a realistic bar for what 'success' looks like on any specific investment.
Free calculator
ROI calculator
Forecast your return on investment and see your payback period based on expected monthly returns.
£
£/mo
Results
Net profit£9.2k
ROI92.0%
Payback period13 months
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ROI as a decision filter, not just a report card
Most founders calculate ROI retrospectively to justify a decision already made. It's far more useful upfront: model the expected monthly return before you spend, and use the resulting ROI% and payback period as your go/no-go threshold.
How this calculator works
- Enter your initial investment amount.
- Enter the expected monthly return (net profit generated).
- Enter the time horizon in months you're measuring.
- The calculator shows net profit, ROI%, and payback period.
Direct answer — ROI Calculator
Calculate your return on investment, net profit, and payback period. Free ROI calculator for business and startup decisions.
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Frequently asked questions
What counts as a good ROI for a small business investment?
It depends heavily on the type of investment and the time horizon, but many small-business investments target 15–30% annualised ROI as a baseline hurdle rate — below that, the capital is often better deployed elsewhere.
How is ROI different from profit margin?
Profit margin measures profitability of revenue (profit ÷ revenue). ROI measures profitability of the investment itself (profit ÷ capital invested) — a much more useful lens when comparing different ways to deploy the same pound.
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