Free online MTBF / MTTF calculator. Calculate Mean Time Between Failures, failure rate (λ), and operational reliability over time.
Frequently Asked Questions
How is MTBF calculated?
MTBF = Total Operating Time ÷ Number of Failures. For a pump running 8,760 hours with 4 failures, MTBF = 2,190 hours.
What is the difference between MTBF and MTTF?
MTBF applies to repairable systems (e.g., pumps, motors). MTTF applies to non-repairable items (e.g., light bulbs, bearings). Both use the same formula.
Can MTBF be higher than equipment design life?
Yes. MTBF is a statistical average, not a lifespan. An asset with MTBF of 50,000 hours may have a design life of 20,000 hours but fails rarely during that period.