Thinking clearly about money
From the three big costs in a budget to the arithmetic of debt and doubling, with calculators to run your own numbers.
Most money advice is about willpower: spend less, try harder, skip the coffee. The pieces in this collection take a different route. They look at where money actually goes, at the small frictions that shape how spending feels, and at what time does to any rate, whether you are earning it or paying it.
The order is deliberate. It starts with the big picture, moves to the definitions and decisions underneath it, and ends with the arithmetic of time. Where an essay raises a question you can answer with your own figures, the next item is usually the calculator for it. Nothing here is financial advice. It is a way of looking that should make your own decisions clearer.
Essay · Idle & Awake Essays
The latte isn't the problem: where your money actually goes
We put this first because it resets the scale. Using official 2024 spending figures, it shows that housing, transport and food take most of an average US household budget, while a daily coffee sits at the edges. Read it with last month's statement open; the useful question it leaves you with is when each of your three biggest costs next comes up for renewal.
Essay · Idle & Awake Essays
The pain of paying: why a card makes money feel cheaper
Once the big costs are clear, this essay turns to the small, frequent ones. It is candid that the famous card-versus-cash result shrank in later studies, which is exactly why it earns a place here: the effect is real but modest, and the fix is modest too. Choose one category that tends to drift and find a way to notice every payment in it for a week.
Answer · Idle & Awake Blog
How Many Hours Is Full Time in the US? 30, 35 or 40
A detour into definitions, and a useful one. Your hourly rate depends on which hours you count, and this answer shows that overtime law, the IRS, labor statistics and payroll conventions each draw the line in a different place, for reasons of their own. It is the context you want before turning any salary into an hourly figure.
Tool · Idle & Awake Tools
Salary to Hourly Calculator
This puts the answer above to work. Enter your pay for whatever period you are paid, then change the schedule to match your real weeks, including any unpaid days. Watching the hourly figure move as the hours change is often more revealing than the headline salary, and it makes two job offers with different schedules easier to compare.
Essay · Idle & Awake Essays
Paying Off the Smallest Debt First Is Worse Math. It Can Still Win.
This is the centre of the collection: a clear case where the mathematically best choice and the choice people stick with can differ. The essay explains why paying the highest rate first usually saves more interest, and why closing small accounts first can still keep people going. It does not pick a side for you; it shows you how to put a price on the difference.
Tool · Idle & Awake Tools
Debt Payoff Calculator (snowball vs avalanche)
The natural companion to the essay before it. List every balance, rate and minimum payment, add what you can spare each month, and compare the payoff date and total interest for both orders side by side. If the gap is small, the case for early wins carries more weight; if it is large, you now know what that comfort would cost.
Essay · Idle & Awake Essays
A 1494 rule of thumb that still explains your money
We end with time, because time is what turns small rates into large numbers. Divide 72 by a yearly rate and you get a rough doubling time; the essay shows the shortcut working on savings, debts and fees alike, and is clear about where it breaks. When you want an exact figure rather than an estimate, run it through the compound interest calculator.
How to use this collection
If you only have ten minutes, read the first essay with last month's statement beside you and note the next renewal date for your largest cost. If you have an evening, work through the debt pair, items 5 and 6, with your real balances. Either way you will finish with a number of your own rather than a rule of thumb borrowed from someone else.