Reliability analytics
MTBF and MTTR that are current every morning, not rebuilt every month.
MaintenanceIQ keeps MTBF and MTTR current for every machine from the breakdowns and work orders your team already records, alongside downtime, planned vs reactive work, PM compliance and a bad-actor ranking. It helps your maintenance manager walk into the morning meeting with facts, and helps your plant head see whether reliability is getting better or worse.
The problem
Reliability numbers that arrive too late to act on
Your maintenance manager knows reliability matters. The trouble is getting the numbers. At month end someone exports breakdown notes, cleans up machine names that were typed three different ways, and builds a pivot table. By the time the chart is ready, the month it describes is over and the next failure has already happened.
So the morning meeting runs on impressions. The machine that failed loudly yesterday gets the attention, while the one that stops for twenty minutes every other day quietly costs more.
Reliability analytics should be a by-product of the work, not a project of its own. When every breakdown is logged against its asset and closed through a work order, the metrics can be kept current without anyone touching a spreadsheet.
MTBF formula
The MTBF formula
Mean time between failures tells you how long a machine typically runs before it breaks down. Higher is better.
MTBF = Total operating time ÷ Number of failures- Total operating time
- The time the machine was running in the period, which is the period length minus the downtime.
- Number of failures
- The breakdowns logged against the machine in the same period.
MTBF describes repairable equipment. For parts you replace rather than repair, mean time to failure (MTTF) is the usual measure.
MTTR formula
The MTTR formula
Mean time to repair tells you how long a breakdown typically keeps a machine out of service. Lower is better.
MTTR = Total repair time ÷ Number of repairs- Total repair time
- The time from each reported breakdown to its resolution, added up across the period.
- Number of repairs
- The breakdowns resolved in the same period.
Try both with your own figures in the free MTBF and MTTR calculator.
What you see
How MaintenanceIQ tracks MTBF and MTTR, and what sits beside them
The Reliability page and the dashboard snapshot build from the records your team creates in the normal course of work. Nobody prepares the data, and the breakdowns behind each figure stay on the asset's own record for anyone who wants to check.
MTBF and MTTR are two lenses. Your maintenance manager also needs to know whether the team is getting ahead of failure or chasing it, which is what the planned vs reactive ratio and PM compliance show.
- MTBF and MTTR per asset
- Downtime totals from logged breakdowns
- Planned vs reactive work ratio
- PM compliance, the share of preventive work done on time
- Bad-actor ranking of the assets causing the most trouble
- Trend charts over time for breakdowns, downtime and PM compliance
Worked example
A month on one pump
Worked example (illustrative)
Take the P-07 transfer pump (an illustrative machine) over a 30-day month, which is 720 hours. Your team logs three breakdowns against it, each closed through a linked corrective work order.
| Breakdown | Repair time (hours) |
|---|---|
| Seal leak | 4 |
| Coupling misalignment | 2 |
| Seal leak | 3 |
| Total | 9 |
Operating time is 720 minus 9, which is 711 hours. MTBF = 711 ÷ 3 = 237 hours. MTTR = 9 ÷ 3 = 3 hours. Two of the three failures are seal leaks, so the next question for your planner is whether the seal needs a preventive task or a different part.
Reading the numbers
Use the two numbers together
MTBF and MTTR answer different questions, and each points to a different fix. A falling MTBF means a machine is failing more often. The answer usually lies in preventive maintenance, operating conditions or a recurring root cause. A rising MTTR means repairs are taking longer. The answer often lies in spares, access, skills or diagnosis.
Together they also give a quick view of inherent availability: MTBF ÷ (MTBF + MTTR). In the pump example that is 237 ÷ 240, about 98.8%. It is a useful sense check next to the Availability figure in OEE.
Faster diagnosis with triage hints
MTTR falls when the technician knows where to look. When a breakdown is reported, MaintenanceIQ shows likely causes, parts often used and the usual priority from your own past repairs on that machine. Every hint can be overridden.
The bad actors first
The bad-actor ranking puts the assets that fail most at the top, so your planner spends limited time where it pays back. Pair it with maintenance cost analytics to see which failures are also the most expensive.
Frequently asked questions
What is the difference between MTBF and MTTR?
MTBF is the average running time between breakdowns, so it measures how often a machine fails. MTTR is the average time to repair a breakdown, so it measures how quickly your team restores it.
Where do the numbers come from?
From the breakdowns and work orders your team already records. Nothing is prepared by hand, and the breakdowns behind each figure stay on the asset's record.
Does MaintenanceIQ only track MTBF and MTTR?
No. The Reliability page also shows downtime, planned vs reactive work, PM compliance, a bad-actor asset ranking, OEE and trend charts. A summary also appears on the dashboard.
Who gets the weekly reliability report?
Admins and managers receive it by email every Monday.
Can I try an MTBF calculation without signing up?
Yes. The free MTBF and MTTR calculator works out both figures from your own operating time, failure count and repair time.
Keep reading
Breakdown and downtime tracking
The breakdown records that MTBF and MTTR are built from.
ReadOEE software
Availability, Performance and Quality per machine.
ReadMTBF and MTTR calculator
Work out both figures from your own numbers, free.
ReadMTBF vs MTTR
The formulas, the counting rules, and a worked factory example.
Read