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Finance · Updated 2026

ROI Calculator (Return on Investment)

Find your investment’s return: the profit, total ROI and annualized return (CAGR), from the amount invested and the final value.

Enter your data

£
£
years

Enter the amount invested, the final value and the period. See the profit, total ROI and annualized return (CAGR).

=Total return (ROI)
+50%
Profit+500 £
Total return (ROI)+50%
Annualized return (CAGR)+14.47%
Multiple1.5×

ROI is the total return over the whole period, and CAGR is the annualized average return (accounting for compounding). It excludes inflation and taxes.

Standard financial formulas (time value of money). Instant in-browser calculation, no account, no data sent. Rates are indicative — check the provider’s actual offer. Last updated: 11 July 2026 · Bank of England base rate.

⚖︎ Results are for informational purposes and do not constitute tax advice. For specific situations, consult a licensed accountant or the relevant tax authority.

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iHow it is calculated

ROI (return on investment) is found by comparing the profit to the initial investment:

ROI = (final − initial) ÷ initial × 100

From £1,000 to £1,500: profit £500, ROI = (1,500 − 1,000) ÷ 1,000 × 100 = 50%; over 3 years, a CAGR of ≈ 14.5% per year.

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?Frequently asked questions

What is ROI (return on investment)?

ROI measures how much you gained relative to how much you invested, expressed as a percentage. It is the simplest indicator of an investment’s profitability.

How is ROI calculated?

ROI = (final value − initial investment) ÷ initial investment × 100. For example, from £1,000 to £1,500: (1,500 − 1,000) ÷ 1,000 × 100 = 50%.

What is the difference between ROI and CAGR?

ROI is the total return over the whole period, regardless of duration. CAGR is the average return per year, which allows a fair comparison of investments with different durations.

What is a good ROI?

It depends on risk and alternatives. ROI is always assessed relative to the period and other options; a share’s return is compared with the market average, not in absolute terms.

Does ROI account for time?

No. A 50% ROI in 1 year is far better than the same 50% in 10 years. To compare across different durations, use the annualized return (CAGR).

How do I calculate ROI for a property investment?

Add the gains (rent received plus value appreciation) and subtract all costs (purchase, Stamp Duty, refurbishment, maintenance), then divide by the total investment.

Can ROI be negative?

Yes. If the final value is lower than the initial investment, ROI is negative and indicates a loss. For example, from £1,000 to £800 gives an ROI of −20%.

How do I compare two investments using ROI?

Compare them over the same period. If the durations differ, convert ROI into an annualized return (CAGR) for a fair comparison between the two.

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