Error Budget Calculator
Calculate your error budget, how much is left, and how fast you're burning it.
- Total error budget
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- Consumed
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- Remaining
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- Burn rate
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- Projected uptime at period end
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- Runs out in
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What is an error budget?
An error budget is the amount of downtime (or failed requests) your SLO allows within a period. If you commit to 99.9% monthly availability, you’ve promised your users no more than about 43 minutes of downtime per month — that 43 minutes is your budget. Teams spend the budget on deploys, experiments, and incident tolerance. When it’s gone, the priority shifts from shipping features to reinforcing reliability.
The burn rate is how fast you’re spending the budget compared to the rate at which it would last the full period. A burn rate of 1.0 means you’ll finish the period exactly on the line. Anything above 1.0 means you’ll burn out early; below 1.0 you’ll have headroom. This tool computes the burn rate from the downtime you’ve observed so far, and projects when the budget runs out.
Monthly figures use the average month length of 30.4375 days. For the full SLA table, see the SLA Calculator.