Website downtime cost calculator
Free, no sign-upHow much could an outage cost? Estimate lost sales and the cost of putting things right.
Outages and revenue
Monthly impact
Revenue not recovered / month
A scenario, not measured losses or lost profit. Engineering costs are separate.
- Engineering / month
- Downtime / month
Cost breakdown and shorter outages
- Sales interrupted / month
- Recovered later / month
- Engineering time and cost / month
| Minutes / outage | Sales interrupted / month | Not recovered / month |
|---|
Calculation and limits
Turnover per minute = monthly website turnover / (days × revenue hours × 60). Exposure = that rate × outage minutes × outages × the rate multiplier × affected share.
Unrecouped turnover = exposure × (1 − recovery share). Engineering cost = hourly cost × person-hours × outages. Shorter-outage comparisons do not assume less engineering work.
These are scenarios, not measured losses or profit. They exclude margin, compensation, reputation and delayed operational effects. Subscription turnover may not stop when a website is unavailable.
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A little more detail
Separate lost sales from the cost of recovery
An outage can interrupt sales without losing every order. A useful estimate makes that distinction, then adds the time spent fixing it.
Compare monitoring intervalsIs this a forecast of what an outage will cost?
No. It is a scenario using the revenue, outage duration and recovery assumptions you enter. Your real exposure depends on when the outage happens, how much of the site fails and whether customers return.
Are lost revenue and lost profit the same?
No. Revenue is the value of sales, before costs. Do not treat all interrupted turnover as lost profit. Use the separate figures here when discussing the risk with a client or business owner.
What about reputation or missed enquiries?
Those may matter more than direct sales for some sites, but this tool does not invent a value for them. Document missed enquiries, support time and other effects separately.
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