Budget Alert Threshold Calculator

Work out budget alert threshold instantly with clear inputs, formula shown and shareable results.

About Budget Alert Threshold Calculator

A percentage-of-budget alert fires too late, because by the time 80 percent is spent the month may be nearly over anyway. Forecast-based alerting projects the current burn rate to month end and fires as soon as the trajectory exceeds budget, which on day twelve gives more than two weeks to react rather than two days.

Formula

Budget projection

burn rate = spend to date / day of month; projected = burn rate x 30.44; variance = projected - budget

Worked example

With the default values below, Budget Alert Threshold Calculator returns Projected month-end spend of $60,880.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Monthly budgetminimum 0.01: 50,000
Current day of the monthaccepts 1–31: 12
Spend so far this monthminimum 0: 24,000
Alert thresholdaccepts 1–200 %: 80 %

Results

Projected month-end spend: $60,880.00
Projected variance against budget: $10,880.00
Daily burn rate: $2,000.00
Alert status: On track to exceed budget by month end

Step by step

1Values used
2Budget projection
3Projected month-end spend= 60,880.00
4Projected variance against budget= 10,880.00
5Daily burn rate= 2,000.00
6Alert status= On track to exceed budget by month end

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is forecast alerting better than threshold alerting?

Because it gives lead time. Crossing 80 percent on day 27 is normal; crossing it on day 12 is an emergency, and only a forecast distinguishes them.

How is a spike distinguished from growth?

Compare the burn rate against previous months' rates at the same day. A step change in daily rate points at a specific event rather than organic growth.