When to use this calculator
Availability percentages become easier to compare when converted into an allowed outage duration over the same period.
Explore the networks & service capacity calculators for other questions in this topic. For a related calculation, use the Bandwidth Delay Product Calculator: Estimate data in flight needed to fill a link across an entered round-trip delay.
PUTTING IT INTO PRACTICE
Availability Downtime: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Availability (%) | 99 |
| Period (days) | 30 |
| Result | 432 minutes |
- Check the input labels and enter the example values above.
- Apply the relationship: Downtime (minutes) = days × 24 × 60 × (1 − availability/100).
- The result is 432 minutes, rounded for display.
How to interpret your result
Assumes the percentage applies to the entire entered period; contractual exclusions are not modelled.
Bits and bytes differ by eight. Average request rate can hide peaks and concurrency. A packet’s serialization delay is only one part of end-to-end network latency.
Frequently asked questions
Does serialization delay equal network latency?
No. Propagation, queuing, processing, framing and other paths can add to total latency.
When is the availability downtime calculator useful?
Availability percentages become easier to compare when converted into an allowed outage duration over the same period.
How do I use the availability downtime calculator?
Enter availability (%), period (days). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Downtime (minutes) = days × 24 × 60 × (1 − availability/100).
What should I check before using the result?
Assumes the percentage applies to the entire entered period; contractual exclusions are not modelled.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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