Count the cost
What does it really cost, in hours of your life?
Try it
1,350 hours of work
That is 169 work days, or about 34 full work weeks.
That is $41,600 a year at 40 hours a week for 52 weeks.
What just happened
You turned a price into time. Divide a price by your take-home pay for one hour and you get its hours-of-life price: how long you work to pay for it.
In the ledger, each ink mark is one hour. Each ruled line is a 40-hour week, and two facing pages make a work year. The total is ruled off with a double line, the way a bookkeeper closes a column.
At $20 an hour, a $6 coffee every workday costs 78 hours a year: almost two work weeks. Whether that is worth it is your call. Now you can see the price.
Why take-home pay, and not the pay on the offer
A price is paid out of the money you keep. Divide it by your pay before taxes and every price looks smaller than it is, because part of each hour’s pay never reaches you. So use what lands in your account for an hour of work.
Paid a salary? Switch the ledger to “a year” and type what you take home in a year. It turns that into an hour at 40 hours a week for 52 weeks.
What a loan costs in total
The car payment in the ledger was $450 a month for 60 months. Here is a loan with that payment. Each bar is one loan length: the money you borrowed in blue, then the interest on top.
A longer loan makes the payment smaller and the total bigger. When someone asks what monthly payment you want, ask for the total too.
The minimum payment trap
A credit card asks for a small minimum each month. When most of that minimum is interest, the balance falls slowly, and the minimum shrinks with it. Compare paying only the minimum with paying the same amount every month.
| Measure | Minimum only | $100 every month |
|---|---|---|
| Paid off in | ||
| Interest paid | ||
| First payment |
Now compare what savings earn. In September 2026 the FDIC’s national average rate for savings accounts was 0.37% a year (FDIC national rates). Each $100 you pay off a 22.15% card stops about $22 a year of interest. The same $100 in that savings account earns about 37 cents.
A small cash cushion still matters, though. Without one, the next surprise bill goes back on the card.
What a little each week becomes
Interest works for you when you are the saver. Put a little away each week and the money you put in rises in a straight line. The growth curves upward, because each year’s interest earns interest too.
Which box is cheaper?
Bigger is not always cheaper. Divide each price by its size to get the unit price: the price of one ounce. Then compare like with like. Change the sizes and prices to match your shelf.
The same gap gives two different percents, because a percent depends on what it is a percent of. A sign that says “40% off” leaves the same question: off of what?
What you give up
Opportunity cost is the next best use of the same money or time: what you give up when you choose.
At $20 an hour, a $6 coffee every workday costs 78 hours of work a year, and the same $30 a week, saved for 30 years at 5%, could grow to $108,194.
Watch: what work and wealth cannot buy
Every price on this page is paid in hours of your life. Ecclesiastes is the book of the Bible that asks what all that work is for.
Where you’ll meet this
| Where | What to ask | On this page |
|---|---|---|
| Groceries | Which size costs less per ounce? Divide price by size, or read the unit price if the shelf tag shows one. | Which box is cheaper |
| A sale: “40% off” | 40% off of what? 40% off $50 is $20 off, so you pay $30. Then ask what you would have paid anyway. | Percent of what |
| A car payment | What is the total? $450 a month for 60 months is $27,000, and part of that is interest. | What a loan costs |
| A phone plan | “$0 down” still adds up: $50 a month for 24 months is $1,200. How many hours of work is that? | The ledger |
| A store credit card offer | A discount today, then the card’s rate on any balance you carry. Will you pay the whole balance every month? | The minimum payment trap |
| Saving a little each week | What does $10 a week become in 20 years? Small, steady amounts are where growth starts. | A little each week |
| Buy now, pay later | Four smaller payments still add up to the whole price. Read what a late or missed payment costs before you agree. | The ledger |
What Scripture says
For which of you, desiring to build a tower, doesn’t first sit down and count the cost, to see if he has enough to complete it? Or perhaps, when he has laid a foundation, and is not able to finish, everyone who sees begins to mock him, saying, ‘This man began to build, and wasn’t able to finish.’
Luke 14:28-30In context. Jesus to the crowds about the cost of following him, pictured as a builder who counts the cost before starting a tower. This site applies the same picture to money.
The rich rule over the poor. The borrower is servant to the lender.
Proverbs 22:7In context. A plain observation of how things work: the rich rule over the poor, and the borrower serves the lender.
Wealth gained dishonestly dwindles away, but he who gathers by hand makes it grow.
Proverbs 13:11In context. Wealth gained by fraud or in a rush dwindles; wealth gathered little by little grows.
Know well the state of your flocks, and pay attention to your herds: for riches are not forever, nor does the crown endure to all generations.
Proverbs 27:23-24In context. Advice to a herdsman: know the condition of your flocks, because riches do not last forever.
for where your treasure is, there your heart will be also.
Matthew 6:21In context. Jesus in the Sermon on the Mount: where your treasure is, your heart will be. About what we love, not only about managing money.
Watch
Use it on your choice
Before you choose, write each option’s cost in hours and in total, interest included. Then add one option you had not listed: a cheaper version, waiting a month, or not buying at all.
Want the bigger picture? Money, step by step finds where you are with saving and debt, and walks you through borrowing, co-signing, lending and giving.