A short guide to Error Budget Calculator
Make the operational trade-off visible.
Calculate allowed downtime or failures from an SLO and current performance. Here is the practical way to prepare the input, read the output, and decide what to check next.
01
When to reach for it
Calculates total allowed minutes from the target and window, then subtracts the supplied elapsed minutes. It is most useful when you are dealing with error budget or SLO target. Start with the smallest example that still shows the behavior.
- Look for error budget, SLO target, remaining reliability.
- Reduce the example until one observation can change the result.
02
How to prepare the input
Paste a focused example in key=value: target, periodHours, elapsedFailures. Leave out unrelated noise so the result stays easy to verify.
- Use the accepted format: key=value: target, periodHours, elapsedFailures.
- Keep the facts that make the behavior reproducible.
- Do not treat missing context as a reason to invent an answer.
Example input
Safe sample
target=99.9 periodHours=720 elapsedMinutes=12
Run this first to see the shape of the result. Then change one meaningful fact and confirm that the output changes with it.
03
How to read the result
Reports total, consumed, and remaining minutes from the supplied SLO facts. Treat the numbers as a planning aid. Check the assumptions, units, and operational limits before making a change.
- Separate the observed fact from the suggested next check.
- Prefer the smallest reversible experiment that can confirm or reject the finding.
- Save the output when it belongs in an incident note, review, or handoff.
04
Know the boundary
A calculation is only as reliable as its units, assumptions, and time window.