Build budget alert configs with actual and forecasted thresholds, resource group filters, and multi-tier notification contacts.
Output will appear here...Projects month-end Azure spend from current spend and elapsed days using a simple linear run-rate model (dailySpendRate times remaining days, added to current spend), then classifies over-budget risk into four tiers based on the projected percentage of budget consumed. This linear extrapolation assumes spending stays constant for the rest of the month, which is a reasonable rough estimate early in the month but becomes systematically wrong for a workload with a known non-uniform spend pattern (heavy month-end batch billing, a planned mid-month scale-up), the tool's projection is a useful early-warning signal, not a substitute for understanding your workload's actual spend shape across the month.
No, it's a pure linear extrapolation from the average daily spend rate observed so far this month, it has no awareness of upcoming, non-uniform cost events. If you know a large cost is coming later in the month (an annual reservation renewal, a scheduled batch processing run), factor that in manually on top of this tool's projection rather than relying on the linear model to have anticipated it.
Risk is based on the projected month-end percentage, not the current percentage, being at 60% of budget on day 12 of a 30-day month with a steady spend rate projects to roughly 150% by month-end (high risk), but being at 60% because of a large one-time early-month cost, with spend then dropping off, could still project to a reasonable month-end total. Check both the current percentage and the projected percentage, they can tell different stories depending on your actual spend pattern.
dailySpendRate reflects what you've actually been spending per day so far this month (current spend divided by days elapsed), a backward-looking average. recommendedDailyLimit is forward-looking, it's the remaining budget divided by remaining days, telling you what your daily spend needs to be for the rest of the month to land exactly at budget, comparing the two tells you whether you need to spend less, the same, or could afford to spend somewhat more for the remainder of the month.
The calculator computes dailySpendRate as currentSpend divided by daysSoFar, projects projectedMonthEnd as currentSpend plus dailySpendRate times the remaining days, then classifies overBudgetRisk into low (at or under 80% of budget projected), medium (80-100%), high (100-120%), or critical (over 120%) based on that projected percentage, and separately computes recommendedDailyLimit as the remaining budget divided by remaining days, a straightforward linear model that doesn't account for known future cost events or non-uniform spend patterns within the month.
Check this projection early in the billing cycle, not at month-end, when there's still enough runway left in recommendedDailyLimit terms to actually course-correct if the projection shows meaningful risk.
Manually adjust for known non-uniform spend patterns (month-end batch costs, annual renewals landing mid-month), the linear model has no visibility into these and will misjudge risk for a workload with a genuinely lumpy cost shape.
Use recommendedDailyLimit as a concrete, communicable target for a team trying to stay on budget, it translates an abstract budget constraint into an actionable daily number that's much easier to reason about day-to-day.
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