SLA Downtime Budget Calculator
An SLA downtime budget converts a target availability percentage into an equivalent downtime allowance over a selected window. The agreement may have special measurement rules and exclusions.
How to use this calculator
- Enter reporting window (hours), required availability (%) using the same measurement window and units.
- Check the result and intermediate values, then change one input at a time when comparing scenarios.
- Keep the stated scope and assumptions attached to any result you share.
Formula and method
Allowed downtime = reporting hours × (100 − target availability %) ÷ 100.
- The simple allowance is 43.2 minutes.
- Contractual SLO/SLA calculations can exclude maintenance, partial outages or specific regions. This model does not interpret contract wording.
Worked examples
Worked example
A 30-day 720-hour window with a 99.9% target permits 0.72 hours.
The simple allowance is 43.2 minutes.
The simple allowance is 43.2 minutes.
Understanding the result
The simple allowance is 43.2 minutes.
Contractual SLO/SLA calculations can exclude maintenance, partial outages or specific regions. This model does not interpret contract wording.
Important notes
Contractual SLO/SLA calculations can exclude maintenance, partial outages or specific regions. This model does not interpret contract wording.
Use measured inputs or documented assumptions, and validate important decisions with the appropriate source specifications or professional guidance.
Frequently asked questions
Does this determine SLA compliance?
No. Compare measured qualifying downtime with the agreement’s precise rules and window.
Why can months differ?
Months have different lengths; use the actual reporting period hours.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.