Lifetime Earnings Calculator — Total Career Income

A working life is long enough that the total passing through it is hard to picture. Thirty-five years is the default here, and at those settings the sum runs to seven figures, a scale that monthly thinking gives no feel for.

The arithmetic is a growing series, not a multiplication. Someone aged 30 on 50,000 with 3% annual growth reaches 3,023,104 by 65. Hold the salary flat instead and the same 35 years give 1,750,000, so growth accounts for more than 1.2 million of the total on its own. Raise the rate to 5% and it reaches 4,516,015, which is 1,492,911 more than the 3% run.

The figure is useful as a denominator rather than a target. Saving a fifth of the default total would come to 604,621 across the working life. A recurring cost works the same way: 200 a month for 40 years is 96,000, which is 3.2% of a three million lifetime total, a share that looks different from the monthly figure in both directions.

Quick example

Current annual salary 50,000, current age 30, expected retirement age 65, annual salary growth 3%. That is 35 working years, and the total comes to 3,023,104.09.

The result card breaks that into the 35 years remaining, the starting salary, the last salary reached at 136,595.26, and an average across the period of 86,374.40. The average is well above the starting salary because most of the growth happens in the later years, which is also why the total is so much larger than salary multiplied by years.

Which inputs matter most

Not the salary, which only scales the answer. Raising each input by 10% from the defaults moves the total by very different amounts: retirement age by 30.1%, current age by 13.2% in the opposite direction, current salary by exactly 10%, and growth by 6.0%.

Percentages of an age are an awkward unit, so in plain terms: five more working years adds 24.7%, a full extra percentage point of growth adds 21.8%, and 10,000 more of starting salary adds 20%. The horizon and the growth rate are close on that framing, and both beat the salary. Note that the two age inputs are the same lever, since only the gap between them enters the sum: retiring at 70 instead of 65 and starting at 25 instead of 30 both give exactly 3,770,063.

What's happening under the hood

The calculation walks forward one year at a time. The current salary is added to the running total, then grown by the rate, and the loop repeats once for every year between the two ages.

Two things follow. The growth applies between years rather than within them, so the first year is the salary entered and the last is that salary grown by one fewer times than the number of years: 34 rather than 35 at the defaults. And the total is a geometric series, which is why it responds so much more to the rate than a linear sum would. At zero growth the same inputs give a flat 50,000 multiplied by 35.

Using this to recalibrate

The figure is worth re-running rather than reading once, because two of the four inputs are guesses and the answer moves a long way across their plausible range.

Growth is the least knowable. Long-run wage growth differs by country, by decade and by occupation, and the International Labour Organization publishes wage statistics that show the spread. The same is true of the horizon: labour force participation at older ages varies widely between countries, which the World Bank tracks, so a retirement age that is normal in one place is early or late in another. Running a low pair of assumptions and a high pair gives a range, and the range here is wide: 1,750,000 at zero growth against 4,516,015 at 5%.