School of Grit
Magic number calculator

What it costs to keep the lights on.

Most people chase a vague “more” forever. Get one number instead: what it costs to keep your life running for a month. Turn it into an hourly rate, and every dollar you earn on the side has a job: buying back hours of your life. Read Corey's post on the exercise.

Your numbers stay on this device. Nothing you type here is sent to us or saved, and refreshing the page clears it. To keep a copy, print it or save it as a PDF.

Step 1

Find your magic number

One month of necessities only: the bills that don't stop coming. No restaurants, no subscriptions, no someday-vacation. Use real bills. Look them up; don't estimate from memory.

Still in uniform? Use what each one will cost after you get out. BAH stops, and health coverage becomes a bill.

$a month
$a month
$a month
$a month
$a month
$a month
Your magic number—Fill in your bills above and it adds them up.
Step 2

Your hourly living rate

About 160 for a normal full-time schedule.

hours
Your hourly living rate—Needs your magic number first.
Step 3

Every dollar buys an hour back

Optional. Leave it blank if you haven't started yet.

$
Hours of your life bought back—Divides what your side hustle brings in by your hourly living rate.
Step 4

How long your savings last

Optional. Cash you could use to cover your magic number if the paycheck stopped.

$
Your runway—Divides your savings by your magic number.

This is arithmetic for planning, not financial advice.

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