Monthly Cash Flow Snapshot
Before any clever money strategy, there's one number that decides everything: do you keep more than you spend? Enter six rough numbers for a fast, judgment-free snapshot of where your month goes. Then hit Process my month and it sizes your spending against the classic 50/30/20 guideline, in your own dollars.
Left over each month
- Money in
- Money out (spending + saving)
- Savings rate
Enter your numbers above to see an estimate.
How this works
We add up everything going out, housing, essentials, debt, lifestyle, and what you deliberately save, and subtract it from what comes in. What's left is your unassigned cash: the buffer that either piles up or quietly disappears. The savings rate is what you set aside divided by what you earn.
Process my month sorts your numbers into three buckets and compares them to the 50/30/20 guideline from the book All Your Worth: roughly 50% of take-home for needs (housing, essentials, and debt payments), 30% for wants, and 20% deliberately saved. It also checks housing against the common 30% affordability line. And it sizes a starter emergency fund at three to six months of your essential costs, the range most consumer guidance uses.
What this does not include
This is a monthly snapshot, so it doesn't smooth out irregular costs like annual insurance, holidays, a car repair, or quarterly taxes. Give those a monthly home (set a little aside) or your real average will be worse than it looks.
The guidelines are rules of thumb, not report cards. The 30% housing line is usually measured against gross income; here it's checked against your take-home, which is a stricter test. And the 50/30/20 split treats minimum debt payments as needs, while extra payments beyond the minimum are really a form of saving. It's a mirror and a compass, not a budget app or a verdict.
How to read your snapshot
Two numbers carry most of the weight. Left over each month is the cash you haven't given a job yet, the money that tends to either pile up or quietly vanish. Savings rate is what you deliberately set aside divided by what you earn, and over a working life it tracks your outcome more closely than your income does.
Then hit Process my month. Say you bring home $10,000 a month: the guideline saving floor is $2,000, needs would stay near $5,000, and wants near $3,000. The point isn't to hit those numbers exactly. It's to see which direction yours lean, and by how many dollars, so the fix is specific instead of vague guilt.
If left over comes out negative, that's the first thing to fix, and it's almost always hiding in the two or three biggest categories, not the coffee. If it's comfortably positive, give that leftover a destination automatically, before it drifts into nothing.
For where this sits in the order of money decisions, and what to do with the leftover once you've found it, start with personal finance basics. When you're ready to put the savings to work, the compound interest calculator shows what a steady monthly amount can become.