BUDGET LAB / LOCAL TOOL
Know how much room is left.
Enter sample request counts and an objective. Calculations happen in this browser; no data is uploaded.
LOCAL CALCULATION
Availability and error budget
Given eligible requests, failed requests and an SLO target, the lab computes observed success and the remaining allowable errors for the same window.
Observed success—
Allowed failures—
Budget remaining—
Allowed failures = floor(eligible requests × (1 − target / 100)). Negative remaining values mean the target has been exceeded for the selected window.
INTERPRETATION
One calculation does not define an incident
This calculator intentionally excludes partial requests, retries, different user cohorts and rolling burn-rate alerting. Decide which requests count before placing numbers into a reliability objective. Production SLO measurements should be calculated from trusted metrics, not from a browser demonstration.