How do I calculate my Coast FIRE number if I'm 32 with $180,000 invested and spending $60,000 a year?

How should this Coast FIRE example be calculated?

For this example, the inputs are age 32, $180,000 already invested, and $60,000 of annual spending. The output depends on the target retirement age, expected return, inflation, and withdrawal rate; without those assumptions there is no single honest number.

A calculator should expose those inputs instead of hiding them behind one headline result. Treat the result as a planning scenario, not a personalised financial recommendation.

Questions readers usually ask

What is the first calculation?
Start with the full FIRE number: annual spending divided by the withdrawal rate. At $60,000 of spending and a 4% rate, the arithmetic target is $1,500,000 before considering taxes, portfolio mix, healthcare, or other plan details.

How does the Coast FIRE number differ from the full FIRE number?
The Coast number is the amount needed today for compounding to reach the future target by the chosen retirement age. It is smaller than the future target when there are enough years and a positive real return, but the gap depends completely on the assumptions.

What does age 32 change?
Age 32 tells the calculator how many years remain until the target retirement age. If the target is 65, the horizon is 33 years. A target of 60 gives a shorter horizon and therefore a higher amount needed today under the same return and withdrawal assumptions.

Why should inflation be an explicit input?
A nominal return is not the same as purchasing-power growth. If the calculator assumes 7% growth and 3% inflation, it is working with an approximate 4% real return before other adjustments. Showing both values makes the result easier to audit.

How can I test whether the result is fragile?
Change one assumption at a time: return, inflation, withdrawal rate, retirement age, and annual spending. Compare the outputs rather than anchoring on one number. Sensitivity checks are especially useful when a small change moves the target by tens of thousands of dollars.

Does the calculator tell me what I should invest in?
No. A Coast FIRE calculation is a math model. It does not choose securities, account types, tax strategies, insurance, or a safe personal withdrawal plan. Those decisions need information about your circumstances that a simple calculator does not have.

Try the focused workflow.
Enter the scenario in the Coast FIRE Calculator, keep the assumptions visible, and compare several cases before treating the output as useful planning information.