Finance

Personal Return on Investment Calculator (35 Years)

Calculate return on investment as a percentage. This personal version uses a 35-year planning term as its starting point.

The Return figure is the total gain or loss over the full 35 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 35 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 35 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 35 years, not a yearly rate. As an illustration only, not the output of this page, the annualised rate behind the same result is about 1.17% a year, because $15,000 divided by $10,000 is 1.50, and the 35th root of 1.50 is about 1.0117. A 35-year figure also hides a lot of real life: career breaks, family costs, withdrawals, and changes of investment, none of which this simple formula records.

Who this term suits for a person: A 35-year term suits a person doing a late-career reality check, for example a pot started early, interrupted by family costs or job changes, and now being judged before retirement. The useful question is not whether 50.00% sounds good, but whether about 1.17% a year, after everything that actually happened to the money, still leaves the retirement plan on track.

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.

Why does the annual rate fall to 1.17% at 35 years even though total ROI is unchanged?
Because the same $5,000 gain is now spread over 35 years instead of fewer. Total return only measures the start and the end, so it stays at 50.00% whatever the term, while the yearly rate must fall as the term lengthens. That is why a long-term ROI should never be quoted without its yearly rate beside it.

How do career breaks or withdrawals affect a 35-year ROI?
They break the simple formula. This page assumes $10,000 went in once and $15,000 came out at the end, with nothing in between. A withdrawal, a pause in contributions, or a switch of investment during 35 years means the printed 50.00% no longer describes the return on all the money actually involved, and a fuller calculation is needed.

Should I compare a 35-year ROI with a shorter, lower-risk return?
Yes, and the yearly rate is the fair basis: about 1.17% a year over 35 years, before fees and tax, against the shorter return's own yearly rate at its own risk. If a shorter, safer holding offered a similar yearly rate, the extra 35 years of risk in the longer holding earned very little, and that comparison should drive the next decision.

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