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About this tool
Work out monthly uptime monitoring cost from endpoint count, check interval, probe locations and alert volume — plus detection time.
An uptime monitoring cost calculator converts a synthetic monitoring setup — endpoint count, check interval and number of probe locations — into check runs per month and the bill that follows, under either metered per-check-run pricing or flat per-monitor pricing. It also reports mean and worst-case time to detect, because a cheap 30-minute interval buys you a slow outage. Calculations use an average month of 30.4375 days (365.25 / 12), so annual figures are exactly twelve monthly ones.
Open Uptime Monitoring Cost Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Shows the check-run count that drives metered billing, so vendor quotes become comparable.
Mean and worst-case detection make the real trade-off of a longer interval visible.
Compares one missed detection against the monthly downtime budget your availability target allows.
43,830 per endpoint per location. An average month is 30.4375 days, or 2,629,800 seconds, so a 60-second interval runs 43,830 times — and 20 endpoints across 3 locations is 2,629,800 check runs a month.
About 43.8 minutes a month, or roughly 8.8 hours a year. 99.95% allows about 21.9 minutes a month and 99.99% about 4.4 minutes — which is why a 5-minute check interval cannot meaningfully verify a 99.99% target.
Yes, almost always linearly. Most vendors bill each location's run as its own check, so three locations at a 1-minute interval costs three times a single location. The upside is that multi-location checks let you distinguish a real outage from one broken network path.
Yes. Each retry adds its own delay before the alert fires, so two retries 30 seconds apart add a full minute on top of the check interval. Retries exist to suppress false positives from a single dropped request; one or two is usually the right balance.
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