Outage Economic Impact Estimator: Country, Sector or Company
When a service like Outlook goes down, people ask what it cost: a company, a sector, a whole country. This estimator answers that the honest way, as a range with the formula shown and the assumptions in plain view. The Microsoft 365 outage that began on 12 November 2026 is the latest example; read what is known in our Microsoft 365 outage briefing. For your own organization's per-service cost and SLA credits, use the Microsoft 365 Outage Cost Calculator.
Worked example: a day of Outlook down in Portugal
A widely shared back-of-envelope estimate assumed 1.0 to 1.5 million office workers, 2 to 4 hours lost each, at about €19 an hour: roughly €38 million to €114 million, before any adjustment for work that was not actually blocked. Those are the example's assumptions, not official statistics.
1. Who was affected
Shown in the export, e.g. Portugal, Acme Ltd, retail banking.
Multiplies the labour cost. Blank = 1.
2. What their time costs
What an hour of work costs the employer (wages plus employer costs). Use your own figure, or pick a Eurostat figure below.
Labels only; no conversion.
Eurostat average hourly labour cost, 2025, in euros, for industry, construction and services excluding public administration (dataset lc_lci_lev, updated 2026-04-23). It covers all employees in those sectors, not only office workers. Eurostat source
100% = no adjustment. Most outages leave some work possible: be honest here.
Sales or billable work that cannot happen while the service is down.
Total hours across all days, not per day.
Enter workers affected, hours lost and an hourly labour cost (or load the example) to see the range. Nothing you type is sent to us.
This is not a measured loss
- A labour-cost estimate of "productivity loss" is not a measured loss. It values the hours at what the employer pays for them; it does not show that output, sales or GDP fell by that amount.
- Much of the work is recovered later: emails get sent after the outage, meetings are moved, people catch up in the following days.
- Some work continues during an outage: phone calls, paper, other tools, offline files, work that never needed the failed service. The "share of work blocked" input exists for this, and 100% is almost always too high.
- Labour costs are averages. A national average hourly labour cost covers all employees in the sectors measured, not only office workers.
- Revenue at risk is not revenue lost. Many sales are delayed, not cancelled.
- This is an estimate for discussion, not financial, legal or economic advice.
The range, the formula, the sensitivity table and the caveats, ready for a briefing note.
TL;DRWhat this estimator does
5 points
- Pick a scope (company, sector or country), then enter a low and high number of workers affected, a low and high number of hours lost each, an hourly labour cost and the share of work that was actually blocked. Revenue at risk and a number of days are optional.
- You get a low, central and high estimate with the formula written out: workers × hours × labour cost × share blocked, plus revenue at risk. A sensitivity view shows which input moves the result most.
- A worked example reproduces a widely shared back-of-envelope estimate for Portugal: 1.0 to 1.5 million office workers, 2 to 4 hours, about €19 an hour, roughly €38 million to €114 million before any "share blocked" adjustment. Those are the example's assumptions, not official statistics.
- For Europe you can pick an official 2025 hourly labour cost from Eurostat instead of typing your own. The result is a labour-cost estimate, not a measured loss: work is often recovered later and some work continues.
- Free to use, signed out too. Everything runs in your browser and nothing is sent to us. Markdown, CSV and PDF exports are available with a paid plan.
Frequently asked questions
How much does a Microsoft 365 or Outlook outage cost a country?
A common back-of-envelope method multiplies the number of workers affected by the hours each lost, by an hourly labour cost, then by the share of their work that actually stopped. For Portugal, a widely shared estimate assumed 1.0 to 1.5 million office workers, 2 to 4 hours each and about €19 an hour, which gives roughly €38 million to €114 million before any adjustment. Those inputs are assumptions, and the answer is a labour-cost estimate, not a measured loss to the economy.
How do I calculate the cost of an outage for my company?
Use your own staff count, the hours of productive work they lost (not just the hours the service was down), a fully loaded hourly cost and an honest share of work that was blocked. Add revenue that could not be earned during the outage. Enter a low and high value for the uncertain inputs and you get a range rather than one false-precise number.
What is the average hourly labour cost in Portugal and the EU?
Eurostat estimates average hourly labour costs in 2025 at €19.4 in Portugal and €34.9 in the EU, for industry, construction and services excluding public administration (dataset lc_lci_lev, updated April 2026). That average covers all employees in those sectors, not only office workers, so it may not match the people affected by an outage.
Is lost productivity the same as an economic loss?
No. Valuing lost hours at labour cost tells you what that time cost employers, not how much output, sales or GDP actually fell. Emails are sent later, meetings move, people catch up, and plenty of work does not need the failed service at all. Treat the figure as an upper-bound style estimate for discussion and say so when you quote it.
What does an hour of IT downtime cost a business?
It varies too much for one number. ITIC's 2024 Hourly Cost of Downtime report says "The average cost of a single hour of downtime now exceeds $300,000 for over 90% of mid-size and large enterprises", based on a web survey of over 1,000 firms worldwide (November 2023 to mid-March 2024) in which organizations report their own downtime costs. That is a self-reported survey figure for enterprises, not a rule; use your own revenue and labour figures where you can.
Is my data sent anywhere?
No. The calculation runs in your browser. Your inputs are saved in this browser's local storage so you can come back to them, and clearing site data removes them.
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