Downtime Calculator
Calculate availability rate, MTBF, MTTR, and the financial cost of unplanned downtime per shift, month, and year.
Frequently Asked Questions
Mean Time Between Failures (MTBF) is the average time a machine operates between failures. MTBF = (Total uptime) ÷ (Number of failures). A higher MTBF means more reliable equipment. It is a key metric for predictive maintenance planning.
Mean Time To Repair (MTTR) is the average time it takes to repair a failure. MTTR = Total repair time ÷ Number of failures. Reducing MTTR improves overall availability. Training, spare parts inventory, and standardized repair procedures all reduce MTTR.
Planned downtime is scheduled and necessary: preventive maintenance, lubrication, operator breaks, scheduled cleaning. Unplanned downtime is unexpected: equipment failure, tooling breakdowns, quality issues causing stoppages. Planned downtime can be optimized but accepted; unplanned downtime should be minimized.
Cost of downtime = Downtime hours × Hourly production value. Hourly production value should include lost revenue, idle labor costs, and any overtime needed to catch up. For most manufacturers, 1 hour of downtime costs $10,000–$250,000+ depending on industry.
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