Free Tool · Infrastructure
Uptime SLA Calculator
Enter an uptime percentage and instantly see exactly how much downtime that allows per year, month, week, and day — in plain English.
%
Standard SaaS
Per year
365 days
8h 45m
31536.00s exact
Per month
30.44 days avg
43m 50s
2630.02s exact
Per week
7 days
10m 5s
604.80s exact
Per day
24 hours
1m 26s
86.40s exact
Estimate Revenue Impact
$/ hour
SLA Reference Table
| Uptime | Per Year | Per Month | Grade |
|---|---|---|---|
| 99% | 3d 15h | 7h 18m | Basic |
| 99.9% | 8h 45m | 43m 50s | Standard SaaS |
| 99.99% | 52m 34s | 4m 23s | High Availability |
| 99.999% | 5m 15s | 26.30 seconds | Enterprise Grade |
| 99.9999% | 31.54 seconds | 2.63 seconds | Enterprise Grade |
All calculations run in your browser. Assumes 365.25 days/year and 30.44 days/month.
How It Works
Convert uptime percentages to real downtime and revenue impact — instantly in your browser.
01
Set your uptime %
Enter any SLA percentage — 99%, 99.9%, 99.99% — or click a tier in the reference table to load it automatically.
02
Downtime calculated
Formula: downtime_seconds = (1 - pct/100) × period. Converted to human-readable hours, minutes, and seconds.
03
Revenue impact
Enter your hourly revenue cost. Impact = (yearly_downtime_hours × cost_per_hour). Shows the real business cost of your SLA.
Example — 99.9% uptime, $5,000/hr revenue
Per Year8h 45m 36s$43,800
Per Month43m 50s$3,650
Per Week10m 5s$842
Per Day1m 26s$120