Error Budget Calculator
Turn an SLA target into a downtime budget for the month, quarter or year, then subtract the downtime you've already had to see exactly how much budget is left.
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End the manual growth tax.
Running checks by hand eats valuable agency time. Uptimeify monitors your entire client portfolio from one place: on a fair, organization-wide quota model, on secure EU infrastructure. No per-client fees, no surprises.
Frequently asked questions about Error Budget Calculator
An error budget is the amount of downtime you're allowed before you break your reliability target. If your SLO is 99.9% over a 30-day month, you're allowed 0.1% of that month down, about 43 minutes. That allowance is your error budget. It reframes reliability from 'never go down' to 'stay within budget', which lets teams balance shipping features against the risk of outages.
It's the chosen window multiplied by your allowed downtime fraction: window × (100 − target) ÷ 100. For 99.9% over a 30-day month that's 2,592,000 seconds × 0.001 ≈ 43m 12s. We then subtract the downtime you've already recorded for the window to show what's left. If you've used more than the budget, the remaining figure goes negative and you're over budget for the period.
That's exactly what continuous monitoring is for. This calculator gives you the budget; Uptimeify measures the actual downtime as it happens across your sites and services, so you always know how much error budget remains without doing the maths by hand, and you get alerted before you blow through it.
Ready to Run Your Error Budget on Real Data?
A budget without measurement is a guess. Uptimeify supplies the uptime history your budget actually needs, complete with automated reports for your clients.