Daily transaction velocity is the average amount leaving your bank accounts each day, measured across a rolling 30 days.
Why daily rather than monthly
A monthly figure is easier to ignore. A daily one is easier to act on, because it converts a decision into a unit you can hold in your head: this subscription costs a day and a half of operating expense, that hire is eleven days a month.
It is the same information as burn rate at a scale that makes trade-offs obvious.
The rolling window
Thirty days rolling rather than calendar-month means the figure updates continuously and does not reset. A spike three weeks ago is still visible today and drops out gradually rather than at midnight on the 31st.
That makes it more responsive than a monthly report and less jumpy than a daily total.
What it is not
It is not profit, and it is not what the business "should" cost. It is outflow — every payment, including ones that will come back as revenue, ones that are owner draws, and one-off purchases that will not repeat.
A single large material order will lift it for a month. Read the level against a normal period rather than in isolation, and read the trend rather than the day.
Where it earns its place
Against cash balance, it is the fastest honest answer to "how long can this go on" — see cash runway. Against last quarter, it is the earliest sign that costs are drifting, usually before it shows up anywhere in a monthly report.