Evaluate any investment by calculating ROI percentage, payback period in months, and total net benefit. Use it for business cases, software evaluations, capital expenditure decisions, or hiring business cases.
Inputs
Total upfront cost of the investment.
Expected annual return, savings, or benefit in pounds.
Number of years to evaluate the investment over.
Results
ROI
80.0%
How to use
Enter the total upfront cost of the investment. Include implementation, setup, and any one-off fees.
Enter the expected annual benefit in pounds. This could be revenue generated, costs saved, or productivity gains valued in monetary terms.
Set the time period in years over which you expect to realise the benefit.
Review the ROI percentage, payback period in months, and total net benefit.
Compare the payback period against your organisation’s hurdle rate or maximum acceptable payback threshold.
Worked Example
Your company is considering investing in FP&A software that costs £18,000 upfront (annual licence plus implementation). The finance team estimates it will save 20 hours per month in manual reporting, worth £12,000 per year in productivity. Let us evaluate the investment over 3 years.
Define the investment cost
Total upfront investment = £18,000 (software licence £12,000/year + £6,000 implementation). For simplicity, we treat the first year’s licence as part of the upfront cost.
Quantify the annual benefit
Time savings: 20 hours/month × 12 months = 240 hours/year. At a blended rate of £50/hour for the finance team, this equals £12,000/year in productivity savings.
Calculate ROI over 3 years
Total benefit = £12,000 × 3 = £36,000. Net benefit = £36,000 − £18,000 = £18,000. ROI = (£18,000 / £18,000) × 100 = 100%.
Calculate payback period
£18,000 / £12,000 × 12 = 18 months. The investment pays for itself within 18 months.
Assess the result
A 100% ROI over 3 years with an 18-month payback is a strong business case. Most CFOs would approve an investment with these returns, particularly when the benefits compound (improved reporting quality, faster decisions, reduced errors).
Key Takeaway
This worked example uses conservative estimates — it does not include qualitative benefits such as improved forecast accuracy, faster month-end close, or reduced audit risk. In practice, the true ROI of FP&A software often exceeds 200% when these factors are included.
Guidance
ROI tells you the percentage return on your investment over the chosen period. An ROI above 0% means the investment is profitable; higher is better. The payback period shows how quickly the investment pays for itself — shorter payback periods carry less risk. Net benefit is the absolute profit in pounds. When comparing investments, consider both ROI percentage and payback period, as a high ROI over a very long period may carry more risk than a moderate ROI with quick payback.
Deep Dive
Return on Investment (ROI) is one of the most widely used financial metrics for evaluating the profitability of an investment. It expresses the net profit from an investment as a percentage of the original cost, making it easy to compare investments of different sizes and types. The core formula is: ROI = (Net Benefit / Investment Cost) × 100.
This calculator uses a simple (non-discounted) ROI model. It multiplies the annual benefit by the number of years, subtracts the investment cost, and divides by the investment cost. This is appropriate for most business case evaluations where the investment horizon is relatively short (1–5 years) and the annual benefit is roughly constant. For longer-term or variable-benefit investments, consider using discounted cash flow (DCF) analysis or net present value (NPV), which account for the time value of money.
The payback period tells you how quickly the investment recoups its cost. It is calculated by dividing the investment cost by the annual benefit and converting to months. A shorter payback period means lower risk — you get your money back faster, reducing exposure to uncertainty. Many organisations have maximum payback thresholds: for example, "all technology investments must pay back within 24 months." The payback period does not account for benefits after the payback point, so it should always be considered alongside total ROI.
When estimating benefits, be rigorous and conservative. Direct cost savings (e.g. eliminating a manual process) are the most credible. Revenue increases should be discounted for probability. Productivity gains should be valued at the blended cost of the time freed up, not the highest possible rate. Where possible, use historical data or pilot results to substantiate your assumptions. A business case built on optimistic projections will lose credibility when the actual results fall short.
Common mistakes in ROI calculations include: ignoring ongoing costs (such as annual licence fees, maintenance, or training), double-counting benefits, using gross revenue instead of net incremental profit, and failing to account for the ramp-up period (benefits rarely materialise from day one). A robust ROI calculation also considers the counterfactual — what happens if you do not make the investment? Sometimes the cost of inaction (lost productivity, competitive disadvantage, regulatory risk) is the most compelling argument.
In Grove FP, you can model ROI scenarios directly in your financial plan. Create a scenario for "with investment" and "without investment," compare the P&L impact, and present the business case with live data rather than static spreadsheets.
Related
Measure your revenue growth rate between any two periods. Calculate period-over-...
Find out exactly how many units you need to sell (or how much revenue you need) ...
Compare your budgeted amounts against actuals to calculate variance in both abso...
Stop running one-off calculations. Build live financial models that update automatically and share results with your team in real time.
FAQ