How to Convert FIT to MTBF

Scientists use MTBF to predict reliability of long-life space projects.
••• Stockbyte/Stockbyte/Getty Images

Space scientists have the task of managing long-life projects that last years, and eliminating failure of mission-critical equipment. Engineers predict the in-service reliability of components using data for mean time between failure, or MTBF. The MTBF for a piece of equipment that contains multiple components is dependent on the individual MTBFs, but the calculation can be complex. Using failures in time, or FIT, simplifies the math. FIT — the expected number of failures in one billion hours — is readily converted to MTBF in hours.

    Note the value in FIT that you wish to convert to MTBF. Check that the value is given in failures per billion hours and write it down.

    Divide 1,000,000,000 by the FIT value that you wrote down and note the result. For example, if the FIT value is 2,500, the result is 400,000 (see Reference 2, Sec.3.6, p.8-p.9).

    Check your calculation. Record the result, which is the FIT value converted to MTBF, in hours.


    • If you don’t want to do the math yourself, you can find calculator software online (see Resource 1).


    • Check your math thoroughly. It is easy to misread the number of zeros when dealing with numbers of this magnitude.

Related Articles

How to Convert Kilometers to Hours
How to Calculate Instantaneous Voltage
How to Convert KWH to KVA
How to Convert Hertz to Milliseconds
How to Convert Minutes to Hundredths of a Minute
Energizer Watt-Hour Battery Specs
How to Calculate the MTBF
How to Convert Hours & Minutes to Decimals
How to Calculate a Semivariogram
How to Calculate Capacitance for AC Coupling
How to Read a Time Clock in Hundredths of an Hour
How to Calculate Tons of Cooling for a Cooling Tower
How to Find Mass in Weight
How to Calculate Yearly Averages
How to Calculate the Spread Rate in Asphalt Paving
How to Convert a Degree in Decimal Degree Form to Degree-Minute-Second...
How to Calculate Time in Decimals
How to Convert Square Meters to Linear Yards
How do I Convert 8 NS to Hertz?
How to Calculate a Recurrence Interval

Dont Go!

We Have More Great Sciencing Articles!