MTBF
Calculate MTBF instantly with the exact formula and a worked example.
MTBF
Number of units
Operating time per unith
Number of failures
MTBF
2,500h
Failure rate
400per 10⁶ h
Failures per unit per year (24/7)
3.504
MTBF
0.285years
More about: MTBF
What it calculates
The “MTBF” calculator computes MTBF in h from 3 parameters: number of units, operating time per unit (h), number of failures.
A handy everyday calculator for daily tasks.
Example calculation
With parameters Number of units = 10, Operating time per unit = 1,000 h, Number of failures = 4 the result is 2,500 h (Count operating time only, excluding downtime).
How to use
- Enter number of units, operating time per unit and number of failures — each field above is adjustable with a slider.
- MTBF (h) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is MTBF calculated?
The MTBF calculator computes MTBF (in h) from number of units, operating time per unit, number of failures. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the MTBF calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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