Downtime Cost Calculator

The honest cost of an outage is more than lost revenue. This calculator adds wasted ad spend, support load, engineering response time, plus qualitative churn and SEO impact. Pick a business-type preset or enter custom numbers.

The four cost lines most calculators miss

A bare “revenue × hours” estimate captures maybe a third of the real cost of downtime. The other two thirds live in cost categories that fire even when nothing visible to customers is happening: engineering response, support load, and wasted paid acquisition.

  • Lost revenue: direct topline impact, easy to estimate.
  • Wasted ad spend: clicks still land during outages, just without converting. Burns budget at full rate.
  • Support load: tickets and chats spike during and after the incident, eating capacity already paid for.
  • Engineering response: incident triage, customer comms, root-cause analysis, post-mortem. Usually more hours than the outage itself.

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Frequently asked questions

How do I calculate the cost of website downtime for my business?

Start with revenue per hour (monthly revenue divided by 730 hours), then multiply by outage duration for direct lost revenue. The honest answer adds four more lines: wasted ad spend (clicks that landed during the outage but did not convert), support load (extra tickets and chats during and after the incident), engineering response time (incident response plus post-mortem, usually a 2-hour floor even for short outages), and qualitative impacts like churn risk and SEO. This calculator does all five and shows them side by side.

Why is downtime more expensive than just lost revenue?

Three reasons most calculators miss. First, ad spend: if you are running paid acquisition, clicks landing during downtime still get charged but cannot convert. Second, engineering time: even a 10-minute outage usually triggers a post-mortem, root-cause investigation, ticket triage, and customer comms. That is easily 2 to 4 hours of engineering work. Third, support load: tickets and chats spike during and immediately after an outage, eating support capacity that was already paid for. Add all three and the total is typically 2x to 4x the bare revenue line.

What is a reasonable estimate for ad spend wasted during downtime?

Depends on your traffic mix. Heavily ad-driven businesses (most e-commerce and lead-gen) typically spend 20 to 40% of revenue on paid acquisition, so during downtime you keep burning that budget without converting. SaaS with strong organic and direct traffic runs 5 to 15%. Pure word-of-mouth or product-led growth is near zero. The calculator presets capture these defaults. Adjust if you have actual numbers from Google Ads or Meta.

Why is there a 2-hour minimum on engineering time?

Even a 10-minute outage usually consumes more engineering time than the outage itself. The on-call engineer is paged, investigates, mitigates, communicates, and then post-mortems. Triage of customer reports continues for hours after the site is back up. We default to 2 hours as a floor because that matches our observation of real incident response, but if your team is leaner or skips post-mortems you can adjust the engineering rate down.

Does website downtime really hurt SEO rankings?

Short outages (under 4 hours) usually have no measurable ranking impact. Googlebot retries failed crawls and assumes transient issues. Outages of 4 to 24 hours can cause temporary deindexing of some pages but rankings typically recover within days. Multi-day outages can cause real ranking drops that take weeks to recover. SEO is only a meaningful cost line for sustained or repeated downtime.

Can I embed this calculator on my own site?

Yes. Click Embed under the calculator for a copy-paste iframe. The embedded version is chrome-less and links back to the full calculator. Use it on commercial sites without asking.

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