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Simple ROI Calculator

The fastest way to sanity-check a purchase or campaign. Two numbers, one tap — get ROI %, payback period and annualised return in seconds.
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Quick ROI Calculator

Rough baseline. The full modeler factors in running costs, tax & depreciation.

Horizon

Net gain (12 mo)

+£20,000

Payback

4.0 mo

Total ROI (indicative)

+200.0%

Annualised

+200.0%

Go deeperUnlock the full industry modeler

How the simple ROI calculator works

ROI (return on investment) measures how much extra money an investment generates relative to its cost. The standard formula is:

ROI % = ((Total return − Initial spend) ÷ Initial spend) × 100

ROIify multiplies your monthly net benefit by your chosen horizon (12, 24 or 36 months), subtracts the initial spend, and divides by the spend. It also shows payback (how many months until the investment pays for itself) and an annualised figure so 2-year and 3-year decisions are comparable.

Worked example

You buy a £10,000 machine. You expect it to add £2,500 in extra monthly profit (after running costs) for the next 24 months. The calculator returns:

  • Net gain (24 mo): £50,000
  • Payback: 4.0 months
  • Total ROI: +500%
  • Annualised: ~145% per year

That tells you the machine pays for itself before the first financial year ends — a strong buy on cash-flow grounds alone.

When the simple calculator is enough

For quick screening — comparing two options, killing obvious losers, or giving a co-founder a 60-second answer — the simple calculator is enough. For a board paper, lender pitch or HMRC-aware decision, switch to the full industry modeler which adds running costs, depreciation, tax relief and risk-adjusted scenarios.

Frequently asked questions

What is a simple ROI calculation?⌄

Simple ROI is (Net gain ÷ Initial investment) × 100. If you spend £10,000 and earn an extra £15,000 in profit over the period, your ROI is 50%.

Is ROI the same as profit?⌄

No. Profit is the absolute pound figure you keep. ROI is that figure expressed as a percentage of what you put in, so you can compare investments of different sizes.

Should I use monthly or annual figures?⌄

Use the time horizon that matches the decision. Equipment is usually modelled over 12–36 months; marketing campaigns over 3–12 months. ROIify lets you toggle 12/24/36-month horizons and shows the annualised return for fair comparison.

What does this calculator not include?⌄

The quick calculator ignores running costs, tax relief, depreciation and seasonality. For a credible business case, use the full industry modeler — it factors those in.

Go deeperOpen the full industry modeler