Free SLA & Downtime Cost Calculator

Step 1: Enter SLA Commitment, Financial Exposure & MTTR

SLA & Incident Cost Inputs

Target SLA Uptime (%)

e.g. 99.9% (Three Nines), 99.99% (Four Nines).

Hourly Business Revenue ($ / hr)

Average gross revenue generated per operating hour.

Affected User / Traffic Share (%)

Percentage of transactions blocked during outage.

Affected Employees

Staff idle or managing incident.

Avg Hourly Cost ($/hr)

Fully loaded hourly compensation.

Monthly Customer MRR ($)

For SLA breach penalty credit.

SLA Credit Penalty (%)

Contractual refund for breach.

MTBF - Mean Time Between Failures (Hours)

e.g. 720h = 1 failure per month.

MTTR - Mean Time to Recovery (Minutes)

Average outage duration to fix & restore.

Remediation & Forensics Cost ($)

War room, emergency vendor & root cause.

Annual Max Downtime

8.77 hrs

43.8 mins / mo (0.1000% downtime)

Cost Per Outage Hour

$11,350 / hr

$9,600 rev + $1,750 labor

Annual Downtime Exposure

$99,493

Allowable Downtime Risk

Simulated MTBF/MTTR Uptime

99.9422%

MTBF: 720h | MTTR: 25.0m (Meets SLA)

SLA Contract Penalty Exposure: $27,500 per catastrophic breach incident

Includes customer credits + remediation overhead

High Availability "The Nines" Downtime & Financial Risk Grid

Comparison of allowable downtime across all industry SLA benchmarks and associated financial exposure.

Availability Target	Downtime / Year	Downtime / Month	Downtime / Day	Annual Revenue & Labor Risk

Site Reliability & Service Continuity

Principles of High Availability & SLAs

Key drivers in enterprise reliability and downtime management:

Exponential Cost of Nines: Moving from 99.9% (Three Nines) to 99.99% (Four Nines) cuts allowable downtime from ~9 hours to ~53 minutes per year, requiring multi-region active-active architectures.
Dual Cost Nature: Outages create both external top-line revenue loss and internal wasted engineering and staff productivity burn.
MTTR is King: While preventing failures (MTBF) is critical, automating recovery (MTTR) is the fastest mathematical path to high availability.
SLA Breach Multipliers: Contractual refunds compound customer goodwill erosion and elevate logo churn.

Test disaster recovery in the Business Continuity Lab.

Mathematical Formulation

SLA & downtime cost formulas

Annual_Downtime_Hours = 8766 × [ 1 - (Uptime% ÷ 100) ]

Hourly_Outage_Cost = ( Hourly_Rev × Affected% ) + ( Staff × Hourly_Wage )

Annual_Financial_Risk = Annual_Downtime_Hours × Hourly_Outage_Cost

Availability_A = MTBF ÷ [ MTBF + ( MTTR_mins ÷ 60 ) ] × 100%

SLA_Penalty = ( Monthly_MRR × Credit% ) + Remediation_Cost

Assess enterprise risk exposure in the Risk Matrix & ALE Lab.

FAQ

SLA & uptime questions

What does 'The Nines' mean in High Availability SLAs?

'The Nines' refers to the percentage of time a service is operational. 99% (Two Nines) permits 3.65 days of downtime per year, 99.9% (Three Nines) permits 8.76 hours, 99.99% (Four Nines) permits 52.6 minutes, and 99.999% (Five Nines) permits only 5.26 minutes per year.

How do you calculate the cost of downtime per hour?

Cost per downtime hour equals Direct Lost Revenue (Hourly Revenue * Affected Customer %) plus Idle Employee Productivity Cost (Affected Staff * Hourly Wage) plus SLA breach penalties and incident remediation costs.

What is the difference between MTTR and MTBF?

MTBF (Mean Time Between Failures) measures the average elapsed operating time between system outages. MTTR (Mean Time to Repair / Recovery) measures the average time required to diagnose, repair, and restore the service back to full functionality.

What are SLA breach service credits?

SLA service credits are contractual financial penalties where a service provider refunds a percentage of monthly recurring revenue (MRR) to customers when uptime drops below agreed-upon performance thresholds.

Can I export the SLA downtime audit to CSV?

Yes. You can export complete SLA uptime targets, allowable downtime across all timeframes, hourly outage loss breakdowns, and MTTR metrics as a UTF-8 CSV spreadsheet with formula defense.

Continue Exploring Service & Continuity Tools

Explore our Service Business Hub, calculate recovery objectives in the Business Continuity Lab, evaluate risk severity in the Risk Assessment Matrix Lab, model service queuing in the Queuing Theory Lab, or analyze client margin in the Client Profitability Lab.