IT Downtime Cost Calculator
Estimate the annual cost of outages by combining lost employee productivity and revenue impact per hour.
Use it to pressure-test assumptions and compare scenarios before shortlist conversations drift into vendor claims. The formula and every assumption behind the output are written out further down the page.
Adjust the assumptions
Regional services business
A mid-sized IT team sees about six notable outages per year, each lasting around 90 minutes, with 65 employees disrupted and meaningful client work delayed.
Why this calculator matters
Teams often talk about uptime in technical terms but struggle to explain what an hour of downtime really costs the business.
This calculator helps justify monitoring, alerting, redundancy, and incident response investment before the next outage becomes the business case.
It also gives procurement and leadership a common number to use when comparing monitoring tools against status quo risk.
Context and practical use
Use this when your team is evaluating network monitoring, observability, or incident-response improvements and needs a simple business-impact estimate.
The model is intentionally practical rather than finance-perfect. It combines direct labor disruption and revenue exposure because those are the two numbers buyers can usually estimate fastest.
Formula and assumptions
- Annual downtime hours = incidents per year × average hours per incident
- Annual productivity loss = annual downtime hours × affected employees × average hourly employee cost
- Annual revenue loss = annual downtime hours × revenue impact per hour
- Annual downtime cost = productivity loss + revenue loss
Inputs this model expects
Practical on purpose, so the calculator is usable before finance-grade assumptions exist. Each default below is the value the form starts with.
| Input | What it means | Default |
|---|---|---|
| Incidents per year | How many notable outages or service interruptions happen in a year. | 6 |
| Average hours per incident | Average business-impacting duration for each outage. | 1.5 hrs |
| Affected employees | Rough number of employees whose work is disrupted during the outage. | 65 |
| Hourly employee cost | Blended hourly cost for employees affected by the outage. | 45 $ |
| Revenue impact per hour | Estimated revenue or customer impact per hour of downtime. | 3500 $ |
Frequently asked questions
- Should downtime cost include both labor and revenue?
Usually yes. Labor disruption shows the internal productivity hit while revenue impact reflects customer-facing or billable work loss. Using both creates a more defensible planning number.
- Is this meant to replace a formal business continuity model?
No. It is a decision-support estimate meant to help buyers size the problem and compare monitoring or resilience investment against a realistic operational baseline.