Outage Impact Revenue Trust & Cost Estimator
Calculate total outage cost including revenue loss, customer churn, SLA credits, and reputation damage.
Worked Examples
Example 1: SaaS Platform Outage Cost Calculation
Problem: SaaS company: $500K monthly revenue, 5,000 customers, 99.9% SLA target. 2-hour outage during business hours. Calculate total impact.
Solution: Direct Revenue Loss:\n- Monthly revenue: $500,000\n- Hourly: $500K / 720 hours = $694/hour\n- 2 hours × $694 = $1,388 direct loss\n- Business hours multiplier: 1.5×\n- Adjusted revenue loss: $2,082\n\nCustomer Churn:\n- Churn risk: 2% (2-hour outage)\n- Customers at risk: 5,000 × 2% = 100\n- LTV per customer: ($500K / 5,000) × 12 months = $1,200/year\n- Churn cost: 100 × $1,200 = $120,000\n\nSLA Credits:\n- Target: 99.9% (43.2 min/month allowance)\n- Actual downtime: 2 hours = 120 min\n- Breach: 120 - 43.2 = 76.8 min over\n- Actual uptime: (720 - 2) / 720 = 99.72%\n- Breach: 99.9% - 99.72% = 0.18%\n- Credit tier (example): 10% of monthly fee\n- Monthly fee estimate: $500K (assume)\n- Credit: $50,000\n\nRecovery Costs:\n- Engineering: 2 hours × 3 engineers × $150/hour = $900\n- Postmortem +
Result: Total impact: $180K | Primary cost: customer churn $120K | $1,500/minute | Prevention investment justified
Frequently Asked Questions
What is the true cost of downtime?
Direct costs: Lost revenue (transactions can't complete), SLA credits (refunds for breaches), recovery (engineering time, postmortems). Indirect costs: Customer churn (frustrated users leave), reputation damage (negative reviews, social media), team morale (burnout from firefighting). Long-term: Brand damage, competitive disadvantage. Total cost is 3-10× direct revenue loss. A 2-hour outage losing $10K revenue may cost $50K total when churn and reputation are included.
How do I calculate lost revenue from downtime?
Formula: (Annual revenue / 8,760 hours) × Downtime hours. Example: $12M annual revenue, 3-hour outage. Hourly revenue: $12M / 8,760 = $1,370. Lost: $1,370 × 3 = $4,110. Adjust for: Time of day (peak hours 2× multiplier), day of week (weekend 0.5× for B2B), partial outage (only 50% of users affected). E-commerce: Use transaction data—avg 100 orders/hour × $80 avg order × 3 hours = $24K lost.
How do I communicate during an outage?
Transparency is critical. Steps: (1) Acknowledge immediately (status page, social media), (2) Provide updates every 30-60 min (progress, ETA), (3) Explain root cause (not just 'technical issue'—give details), (4) Post-incident report (24-48 hours later: what happened, why, how preventing repeat). Bad: Silence, vague updates, defensiveness. Good: Honest, detailed, empathetic, actionable prevention plan. Stripe, GitHub set gold standard.
What is the cost of reputation damage?
Hard to quantify but measurable in: (1) Customer acquisition cost (negative reviews increase CAC), (2) Churn acceleration (customers more likely to leave over minor issues), (3) PR/marketing spend to rebuild (crisis management, campaigns). Estimate: Major outage can increase CAC 20-50% for 6-12 months. If CAC is $100 and you acquire 500 customers/month, damage = $10K-25K/month for year = $120K-300K. Long-term: Brand equity reduction.
How do I forecast revenue?
Bottom-up forecasting multiplies expected units sold by price. Top-down starts with market size and estimates market share. For existing businesses, use historical growth rates with adjustments. For SaaS: Forecast MRR = Current MRR + New MRR - Churned MRR + Expansion MRR. Always model best, expected, and worst case scenarios.
How do I calculate customer acquisition cost (CAC)?
CAC = Total Sales and Marketing Expenses / Number of New Customers Acquired in that period. Include all related costs: advertising, salaries, tools, commissions, and overhead. CAC payback period = CAC / Monthly Gross Margin per Customer. A payback period under 12 months is generally healthy for SaaS businesses.