Free tool, no signup
Downtime cost calculator
Enter your average monthly revenue and how many minutes of downtime you’re pricing, and we’ll estimate what that downtime costs. No account required.
Pick a starting point from a common target:
How this is computed
We divide your monthly revenue by the minutes in an average month (365 ÷ 12 days) to get a revenue-per-minute figure, then multiply it by the downtime minutes you enter. That’s the whole formula: no assumptions about which customers you’d lose permanently versus which would just come back later, no brand-damage multiplier, nothing we can’t show you the arithmetic for.
Real revenue is rarely spread evenly across a month. An outage during your busiest hour costs more than this estimate; one at 3am on a slow day costs less. Use this as a starting number for a conversation, not a precise loss figure.
Pricing an SLA target instead of a real incident
Not sure how many downtime minutes to enter? The preset buttons above fill in the monthly downtime a common SLA target allows (99%, 99.9%, 99.99%, and so on), computed the same way the SLA / uptime calculator pages compute it. That tells you what a target costs if a vendor uses every minute the target allows, worst case, not what any particular vendor actually did.
The real fix is fewer minutes, not a bigger spreadsheet
Knowing what downtime costs makes the case for catching it faster. RealUptime Monitor checks your endpoints from four live regions on a schedule and alerts you the moment one fails, so the number above stays a hypothetical instead of a monthly bill.
More free tools
SLA / uptime calculator, Is my website down?, and SSL certificate checker. See all free tools.