Free MTBF Calculator

ALD MTBF Calculator is a free software tool for Reliability Prediction. You enter electronic or mechanical component data and receive its predicted MTBF (Mean Time Between Failures) and Failure Rate.

5 Steps of Reliability Prediction and MTBF/FR Calculation


         1. Select Component Family and Type mtbf calculator

         2. Select Reliability Prediction Method

         3. Select Environment and Temperature

         4. Enter Component Parameters

         5. Get MTBF and FR





Still calculating MTBF in Excel?


Reliability Prediction Standards


MIL-HDBK-217E-1 Part stress MTBF Reliability Prediction Standards

MIL-HDBK-217F-1 Part count, MIL-HDBK-217F-1 Part stress, 

MIL-HDBK-217F-2 Part count, MIL-HDBK-217F-2 Part stress


CNET RDF93 rev 02/95
FIDES Guide 2004, FIDES 2009
GJB/Z 299B Part count, GJB/Z 299B Part stress

GJB 299C Part count and Part stress
IEC 62380
Telcordia Issue 1, Telcordia Issue 2
Siemens SN 29500-1

Siemens SN 29500-2005-1 (Siemens Norm)
UTE C 80-810 (RDF2000)
NSWC-98/LE1 Mechanics 



The software package also contains Reliability Data Component Library for active electronic components (IC-Digital, IC-Analog, IC-Memory) and Part Number automatic recognition algorithms for the most popular manufacturers of capacitors and resistors (see user guide for manufacturers list).


You don't need to know MTBF or MTTR formulas in Excel!

Questions Concerning Free MTBF Calculation Software


Is ALD MTBF Calculator free?

MTBF Calculator is a freeware calculator. It is absolutely free - there is no time limit or installations count limit. Download, install and use it.

Why is it free?

ALD Reliability and Safety Solutions Ltd. has been working in the field of reliability, safety and quality of the safety-critical and mission-critical equipment
(mainly aerospace, defense, transportation and telecommunications) for over 30 years.
We support the promotion of System Reliability and Safety and wish to make Reliability Prediction more accessible for reliability engineering practitioners and students.

How to use it for reliability prediction?

ALD MTBF Calculator is Windows Desktop application. You should download and install it on your PC with MS Windows.
For operational instructions, please see the MTBF Calculator User Manual - Reliability Prediction with ALD MTBF Calculator.

Where to get it?

Download free MTBF Calculator directly from our web site by clicking this link: Download Free ALD MTBF Calculator.

How to install it?

Save the installation file to your local hard drive and run it. Installation wizard will guide you through the setup process.
Then run the MTBF calculator from your Start menu, "ALD Engineering" menu group.
See MTBF Calculator Installation Guide for detailed setup instructions.

What if I have problems or questions?

The MTBF calculator is a freeware tool and is provided as-is, without technical support.
However, we are committed to continuously improve it and therefore appreciate your comments and suggestions - please send them to This email address is being protected from spambots. You need JavaScript enabled to view it. .