Annualized Return Calculator

Annualized return = (Final value ÷ Initial value)^(1 ÷ years) − 1; with dates, years = days ÷ 365

Why annualize a return

A raw gain is hard to compare: 30% sounds great, but 30% over six months is far better than 30% over six years. Annualizing strips out the time by expressing the result as a steady per-year rate — the compound annual growth rate — so two investments held for different lengths of time can be judged on the same footing.

It works from just three numbers: what the investment was worth at the start, what it is worth at the end, and how long you held it. Enter the duration directly, or switch to date mode to annualize on the exact number of days between two dates — useful when “about three years” is really three years and two months.

Worked example — $10,000 grows to $18,000 over 5 years: Total return = 18,000 ÷ 10,000 − 1 = 80%. Annualized = (18,000 ÷ 10,000)^(1 ÷ 5) − 1 ≈ 12.5% a year. Add $1,500 of dividends received and the total return becomes 95%, or about 14.3% a year.

Total return vs annualized return

The two figures answer different questions. Total return is the whole gain over the entire period — the number that tells you how much richer you are. Annualized return is the smoothed yearly rate behind it — the number you use to compare against other investments, a savings rate, or inflation.

Because returns compound, the annualized figure is always less than the total divided by the years: doubling your money over ten years is 100% in total but only about 7.2% a year. The calculator shows both side by side so the difference is plain.

Including income

Price change is only part of an investment’s return. Dividends from shares, interest from bonds, or distributions from a fund all add to what you actually earned. Enter the total income received over the period and the calculator adds it to the final value to give a total return — and an annualized return — that reflects the full result, not just the change in price.

This matters most for income-heavy holdings: a stock that barely moved in price but paid a steady dividend can have a respectable total return that the price-only figure completely misses.

What it does not capture

Like any two-point measure, this uses only the start, the end and the time between — it says nothing about the bumps along the way, so two investments with the same annualized return can have had very different rides. It also assumes a single lump invested at the start; if you added or withdrew money during the period, the annualized return overstates or understates the true performance, and a money-weighted measure such as XIRR is the right tool instead.