Investment Return Calculator

This investment return calculator helps you measure how much an investment has gained or lost over a specific holding period.

Enter the initial investment, final value, investment length, and any fees or costs you want included. The calculator shows net profit or loss, total return percentage, net final value, total cost basis, and annualized return.

Annualized return is useful because it smooths the investment result into an average yearly rate, making different investments easier to compare. It is still a simplified start-to-finish measure, so it works best when there were no extra deposits, withdrawals, dividends, or tax adjustments during the period.

If you invest GBP 10,000 and it grows to GBP 13,500 after four years, the total profit is GBP 3,500 before tax and any extra fees you have not entered. If you add GBP 100 of costs, the net result is lower because those costs reduce the final value used in the calculation.

The annualized return is lower than 35% because the gain happened over multiple years. Annualized return converts the result into a yearly rate, making it easier to compare with another investment measured over a different length of time.

A 20% return over one year is very different from a 20% return over six years. Annualized return accounts for time so you can compare investments more fairly.

Use annualized return alongside risk, volatility, fees, taxes, and inflation. The highest return is not always the best investment if it required excessive risk or poor liquidity.

Include fees, platform charges, dealing costs, and currency conversion where relevant. For a more complete view, compare nominal return with inflation-adjusted return and check whether tax changes the amount you actually keep.

Review returns over several periods rather than relying on one start and end date. A single unusually strong or weak period can distort the picture, especially with volatile investments.

This calculator measures what happened between one initial investment and one final value, with a simple fees or costs input.

Net final value subtracts fees from the final value, while net profit compares that result with the initial investment.

Total return shows the overall percentage gain or loss. Annualized return smooths that result across the number of years entered.

If there were deposits, withdrawals, dividends, tax adjustments, inflation adjustments, or irregular cash flows during the holding period, keep a note of them because this simple return view will not explain the whole story. Use the IRR money-weighted return calculator for multiple investor cash flows or the time value of money calculator when discounted cash flows or NPV are the real question.

Using it for multiple deposits or withdrawals, where a money-weighted return or IRR tool may be a better fit.

Leaving fees at zero when trading costs, platform charges, or currency costs affected the real result.

Comparing returns over different time periods without looking at the annualized return.

Use cagr when you want a clean compound annual growth rate from start value, end value, and years.

Use investment when you want to project future balances from contributions and return assumptions.

Use stock profit when the result depends on share quantity, buy price, sell price, and trading costs.

Rerun the result when final value, fees, or the measured time period changes.

Use the same start and end dates when comparing two investments.

Keep tax and inflation separate unless you have already adjusted the values before entering them.

Compare your result to a relevant index or fund category over the same dates — a stock pick should not be judged against cash returns or vice versa.

Separate luck from process: one strong year does not prove skill; look at rolling 3–5 year periods and fees paid.

Feed annualised output into CAGR calculator when you need a clean growth rate for planning documents or goal tracking.

Document cash flows in and out — dividends withdrawn mid-period change total return versus price-only charts on a brokerage app.

ISA, pension, and taxable accounts report returns differently — compare like with like before deciding one account underperformed.

Realised gains from selling create tax events that headline return charts may not show until you file.