How do I calculate MTTFd — Mean Time to Dangerous Failure?

To calculate MTTFd — Mean Time to Dangerous Failure: Enter B10d from manufacturer, Operating cycles per hour, Operating hours per day and other values. Click Calculate. INDUGRID computes the result instantly using the formula: MTTFd [years] = B10d / (0.1 × n_op) where n_op = operating cycles per year. No registration required.

What units does the MTTFd — Mean Time to Dangerous Failure calculator use?

The MTTFd — Mean Time to Dangerous Failure calculator uses the following units: cycles, cyc/h, h/day, days/year. SI units are used by default.

Is the MTTFd — Mean Time to Dangerous Failure calculator free?

Yes. The INDUGRID MTTFd — Mean Time to Dangerous Failure calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Machine Safety

MTTFd — Mean Time to Dangerous Failure

Calculate MTTFd (Mean Time to Dangerous Failure) for safety components, a key parameter in ISO 13849-1 Performance Level verification.

Units:

in LinkedIn

💡MTTFd is provided by the component manufacturer in years or as B10d (number of cycles to 10% dangerous failures). Low MTTFd = short life before dangerous failure. PL d/e requires MTTFd High (30–100 years per channel). Always get B10d from the manufacturer's safety manual.

MTTFd [years] = B10d / (0.1 × n_op) where n_op = operating cycles per year

Input

B10d from manufacturer iNumber of cycles at which 10% of components have failed dangerously. From manufacturer safety datasheet.

cycles

Operating cycles per hour iNumber of actuations/cycles per hour in actual operation.

cyc/h

Operating hours per day iHours of machine operation per day.

h/day

Operating days per year iNumber of working days per year.

days/year

Result

Annual operating cycles n_op [cycles/year] —

MTTFd [years] —

MTTFd classification —

Max. PL contribution (single channel) —