Finance

Personal Return on Investment Calculator (25 Years)

Calculate return on investment as a percentage. This personal version uses a 25-year planning term as its starting point.

The Return figure is the total gain or loss over the full 25 years, shown as a percentage of the amount invested. A positive Return means the final value is higher than the amount invested, a negative Return means it is lower, and a Return of 0.00% means the money came back unchanged. Because it covers the whole 25 years, it is not a yearly rate, so compare it only with returns measured over the same length of time and with similar risk.

Formula

Return equals final value minus invested amount, divided by invested amount, times 100.

How it works

A positive return means the final value is higher than the amount invested.

Worked example

Amount invested $10,000, final value $15,000, term 25 years. First, the gain is $15,000 minus $10,000, which is $5,000. Using the page formula, return is $5,000 divided by $10,000, times 100, which is 50.00%. That is the total return over the whole 25 years, not a yearly rate. As an illustration only, not the output of this page, the annualised rate behind the same result is about 1.64% a year, because $15,000 divided by $10,000 is 1.50, and the 25th root of 1.50 is about 1.0164. This formula also assumes a single $10,000 lump sum with nothing added or taken out, so if money was added during the 25 years, the true return on all the money put in would be lower than this simple figure suggests.

Who this term suits for a person: A 25-year term suits a person reviewing a career-span pot, for example money invested at 30 and checked at 55 before retirement planning sharpens. The review should ask two things: was about 1.64% a year enough for 25 years of risk, and does the simple lump-sum formula still describe what actually happened, or were top-ups and withdrawals involved?

FAQs

What is a good ROI?
There is no single good figure. Compare returns over the same period and with the same risk before deciding.

Is this personal calculator exact?
No, it is an estimate for planning only, based on the numbers you enter.

Are these figures financial advice?
No, they are estimates for planning only, not financial advice. Check with a qualified adviser for decisions involving large sums.

How does compounding change the reading at 25 years?
The yearly illustration of about 1.64% a year already allows for compounding: it is the steady yearly rate that would turn $10,000 into $15,000 over 25 years. That is why it is lower than simply dividing 50.00% by 25, which would give 2.00% a year and overstate the result. For long horizons, always use the compound yearly rate, not the total divided by the years.

What if I added money during the 25 years, does this formula still fit?
No. This formula assumes one $10,000 lump sum and one final value, with nothing added or withdrawn. If money was topped up, the true return on all the money put in is lower than 50.00%, because more than $10,000 was invested in total. A money-weighted return, not this simple formula, is needed for a holding with regular top-ups.

Should a 25-year plan be reviewed, not left alone?
Yes. A plan left untouched for 25 years can drift far from its original goal as jobs, family costs, and markets change. The ROI check at 25 years should trigger a review of the mix, the fees, and the remaining time to the goal, rather than a decision to simply leave the same holding for another 25 years.

Estimates only, not financial advice. Figures are approximate and do not include all fees, taxes, or changing rates unless stated.