Break-Even Age Calculator

Break-even age is the age a specific financial milestone arrives: a target net worth, a debt cleared, the point where invested assets could cover spending. The calculator takes where you are now and how fast you are adding to it, then counts forward to the first year the target is met.

Starting at 35 with 100,000 and saving 20,000 a year at a 7% return, a 1,000,000 target arrives after 18 years, at age 53. Raise the target to 2,000,000 and it takes 27 years, reaching it at 62. Keep that larger target but save 30,000 a year instead and it comes back to 23 years, at 58. Doubling the target costs nine years; raising savings by half wins four of them back.

An age is easier to picture than a balance, which is what makes the format land. It is also easier to over-read. The projection assumes an uninterrupted run of identical years, which is not how careers or markets behave, and the result is quantised to whole years, so it is a coarse instrument by construction rather than a precise one.

Run it with sensible defaults

Using a current age of 35, current net worth of 100,000, target net worth of 1,000,000, annual savings of 20,000 and a 7% return, the calculation works out to Age 53, which is 18 years away. The defaults are a starting point rather than a suggestion, and they are unit-free: the same answer follows from any currency, since only the sizes relative to each other matter.

The levers in this calculation

All four financial inputs move the headline, and they do not move it equally. Halving and then doubling each one from the defaults gives a clear ordering: the target spans 16 years, from 11 at 500,000 to 27 at 2,000,000. The return rate spans 13, from 25 years at 3.5% to 12 at 14%. Annual savings spans 10, from 23 years at 10,000 to 13 at 40,000. Current net worth spans only 5, from 20 years at 50,000 to 15 at 200,000.

Current age is different again: it does not change the number of years at all, it just shifts the age they land on, one for one. And because the count is in whole years, small adjustments often change nothing at all. From the defaults it takes roughly 2,200 more of annual savings, or 0.7 percentage points more return, or 20,000 more of target, before the headline moves by a single year. An extra 200 a month, which sounds substantial, moves 18 years to 17.

How the math works

The balance starts at current net worth. Each year it is multiplied by one plus the return rate, then the year's savings are added, and the year counter increases. The loop stops the first year the balance reaches or passes the target, and break-even age is current age plus that count.

Three consequences follow from doing it this way rather than solving algebraically. Savings are treated as arriving at the end of each year, so they earn no return in the year they are made. The answer is always a whole number of years, never a fraction. And the loop gives up after 100 years, reporting 100+ rather than an age, which is what a starting net worth at the slider minimum of minus 1,000,000 produces at the default savings rate.

Using this to recalibrate

The figure worth watching is not the age itself but how far it moves when an assumption changes, because that separates what is known from what is guessed.

The return rate deserves the widest range: at 0% the same inputs take 45 years and land at 80, while at the 15% ceiling they take 12 and land at 47. Real interest rates and long-run returns vary by country and by decade, and the World Bank publishes real rate series by country that show the spread. Running the calculation at a deliberately low rate and again at an optimistic one produces a band rather than a date, which is a more honest reading of a projection this far out. Investor education material from IOSCO, whose members regulate securities markets in more than 100 jurisdictions, covers the same gap between an assumed average and what actually arrives.