MTBF Availability Estimator
Estimate steady-state availability from mean time between failures and repair duration.
Your inputs
Calculation results
Formula & assumptions
Availability = MTBF/(MTBF+MTTR); assumes the supplied mean-time model applies.
Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.
Compare your scenarios
Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.
Using MTBF Availability Estimator
Estimate steady-state availability from mean time between failures and repair duration.
- Enter mean time between failures, mean time to repair using the units printed under each field.
- Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
- Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.
Example
Mean time between failures: 1000 hours Mean time to repair: 2 hours Estimated availability · percent: 99.800399 Expected downtime per 30 days · hours: 1.4371257
Questions & answers
What does MTBF Availability Estimator calculate?
Estimate steady-state availability from mean time between failures and repair duration.
Which units should I enter?
Mean time between failures uses hours. Mean time to repair uses hours. Convert values to these units before calculating.
Which formula does it use?
Availability = MTBF/(MTBF+MTTR); assumes the supplied mean-time model applies.
What does the included example show?
Mean time between failures: 1000 hours; Mean time to repair: 2 hours. Result: Estimated availability · percent = 99.800399; Expected downtime per 30 days · hours = 1.4371257.
Can I compare different settings?
Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.
Can I export the calculation?
Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.
Related tools
A useful next step for your task.
Developer & DataLoad Test Ramp PlannerPlan a linear user ramp from starting to target concurrency.
Developer & DataPolling Request Budget CalculatorEstimate request volume generated by repeated polling clients.
Everyday CalculatorsScientific CalculatorCalculate powers, roots, trigonometry, logarithms and factorials with degree/radian modes, memory, unrounded answer reuse and temporary history.
Developer & DataJSON Formatter & ValidatorHighly recommendedInstantly format, minify, and validate your JSON code. Features include live preview, syntax highlighting, tree viewer, and structure stats.
Help improve this tool
Report a problem or suggest an improvement
Describe the issue without pasting private tool input. Feedback goes to our admin inbox.