How much downtime is allowed under a 99.9% SLA?

99.9% SLA: 8.77 hours/year, 43.8 minutes/month, 10.1 minutes/week. Most web applications target 99.9%. Enterprise SLAs often require 99.95% or higher for customer-facing services.

What infrastructure is needed for each SLA tier?

99.9% requires: redundant server (N+1), automated monitoring. 99.99% requires: multi-AZ deployment, active-passive DB. 99.999% requires: multi-region active-active, zero-downtime deployments.

Does planned maintenance count against SLA?

Depends on contract terms. Most enterprise SLAs exclude pre-notified maintenance windows. SaaS products typically include maintenance in SLA calculations.

SLA 99.9% Downtime Minutes Calculator

Calculate allowed downtime for SLA tiers. 99.9% = 8.76 hrs/yr, 99.95% = 4.38 hrs/yr, 99.99% = 52.6 min/yr. Convert SLA percentage to hours and minutes per year/month.

AI & SaaS Tools

SaaS Metrics

AI Compute

AI ROI

LTV:CAC Ratio

ARPU ($/month)

Monthly Churn %

CAC ($)

Gross Margin %

LTV

$3500

LTV:CAC

11.67

Payback

2.9 mo

Health

Healthy ✓

Benchmark: LTV:CAC ≥ 3 is healthy. Payback under 12 months is excellent. Under 1 means you lose money on each customer.

How to Use

Enter the values for the scenario you are assessing. Calculate allowed downtime for SLA tiers. 99.9% = 8.76 hrs/yr, 99.95% = 4.38 hrs/yr, 99.99% = 52.6 min/yr. Convert SLA percentage to hours and minutes per year/month. Use the sla 99.9% downtime result to inform your calculation.

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Frequently Asked Questions

How much downtime is allowed under a 99.9% SLA?

What infrastructure is needed for each SLA tier?

Does planned maintenance count against SLA?