Understanding MTTR
How we calculate. MTTR = sum of restore durations ÷ number of incidents. See our methodology and accuracy policy .
Real-world scenario: A typical MTTR case uses total restore time 250 and incidents 5. Enter the same figures below to reproduce the worked path.
What is MTTR?
A DORA stability metric. Clarify whether the clock stops at mitigation or full recovery.
- Use one time unit (minutes recommended)
- Count customer-impacting incidents
- Document start/stop events
The Formula
Worked Example
Common Use Cases
- SRE reviews: recovery speed
- On-call health: weekend vs weekday
- SLO programs: error-budget burn context
Pro Tips
- Exclude planned maintenance if policy says so
- Track MTTD separately
- Improve runbooks when MTTR spikes
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: MTTR results are educational DevOps/FinOps planning aids—not SLAs or billing guarantees. Confirm definitions with your platform and finance policies.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
The worked example for mttr calculator was verified with the calculator form on this page—enter the same values to confirm the result.
When to use this calculator
- Use this page when your wording matches mttr calculator and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about mttr calculator? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this mttr calculator calculator?
For mttr calculator, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for mttr calculator—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking mttr calculator, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For DORA and FinOps definitions, consult:
- DORA — Four Keys research and definitions
- Google SRE books — SLOs and error budgets
- FinOps Foundation — cloud cost practices