MTTR, MTTD & MTBF calculator
Turn incident totals for a period into mean time to detect, to repair and between failures, plus the availability they imply.
How it works
MTTD is the average time before someone knew, MTTR the average time to fix, and MTBF the average working time between incidents.
MTTR = repair time ÷ incidents
MTBF = (period − downtime) ÷ incidents
availability = MTBF ÷ (MTBF + MTTR)Questions
Which one should I improve first?
Usually MTTD: you can’t fix what nobody has noticed, and better alerting shortens every incident.
Do short blips count as incidents?
Count what you would review. Mixing tiny blips with real incidents makes the averages meaningless.