Definition The percentage of time a system or service is available and working.
Example A service down for 43 minutes in a 30-day month has about 99.9% uptime.
For your role Your role Choose your role Accounts payable Credit controllers FP&A analysts Finance business partners Finance directors and CFOs Financial controllers Management accountants Payroll specialists Account executives Sales managers Sales operations analysts Sales representatives Bid and tender managers Commercial directors New to business Pricing analysts Revenue managers Senior leaders Campaign managers Communications managers Customer insight analysts Digital marketing managers Marketing analysts Marketing directors HR business partners HR directors Learning and development managers People analysts People managers Recruiters Operations analysts Operations directors Operations managers AI product managers Heads of product Product analysts Product managers Product owners Machine learning engineers Analytics engineers Data analysts Data architects Data engineers Data governance leads Data privacy officers Data scientists Information architects Platform engineers Report builders Business analysts Corporate development managers Heads of strategy Strategy analysts
Choose your role to see what this term means in your work.
Why it matters Users and customers expect services to be available when they need them.
Where it is used IT service reports, supplier contracts and status pages.
How to calculate it Time available ÷ total time in the period × 100
Worked example A service down for 43 minutes in a 30-day month has about 99.9% uptime.
Definitions vary. Some exclude planned maintenance from downtime, which makes uptime look higher. Check how your organisation calculates it.
