SLA Calculator

Convert SLA uptime percentages into concrete downtime budgets so teams can reason about reliability commitments.

Uptime percentage

About

The SLA Calculator converts uptime percentage targets into concrete downtime budgets, expressed as hours and minutes per year, month, week, and day. Useful for SLO planning, vendor contract reviews, and communicating reliability commitments to non-technical stakeholders.

Accepted input

Accepts load-test exports, timing values, HAR files, or throughput assumptions. Large result sets are summarized locally for faster inspection.

How to use

Select a standard uptime preset (99%, 99.9%, 99.95%, 99.99%) or type a custom value.
The table below shows the corresponding downtime budget across all time windows.
Use Copy link to share a specific SLA calculation with a teammate.

Tips

99.9% ("three nines") allows about 8.7 hours of downtime per year, which is more than most teams expect.
For multi-dependency systems, multiply error budgets: two 99.9% services compose to roughly 99.8%.
Custom input accepts values between 90% and 99.999%.

SLA Calculator

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