Database Restore Time Estimator
Estimate a restore window using throughput measured for the actual environment. The tool shows the method and key assumptions so you can inspect how the input values lead to the estimate.
How to use this calculator
- Enter backup data to restore (gib) using the unit and definition shown beside the input.
- Enter effective restore throughput (mib/s) using the unit and definition shown beside the input.
- Enter additional setup and validation overhead (%) using the unit and definition shown beside the input.
- Check that all values refer to the same time period and scenario.
- Review the outputs alongside the assumptions before using them in a decision.
Formula and assumptions
Base minutes=data GiB×1024/throughput MiB/s/60; estimate applies the stated overhead percentage.
- Use effective measured throughput including storage, network and decompression limits. This estimates elapsed duration, not whether recovery objectives or consistency requirements are met.
- The estimate is calculated from values you enter. It does not connect to external accounts, obtain live prices, or validate local regulations or engineering specifications.
Worked examples
Worked example
180 GiB at an effective 95 MiB/s takes about 32.3 minutes before an 18% overhead allowance.
Enter the data size, measured MiB/s and an overhead assumption.
Test recovery procedures periodically; estimates are not a substitute for restore drills.
Understanding the result
Use effective measured throughput including storage, network and decompression limits. This estimates elapsed duration, not whether recovery objectives or consistency requirements are met.
Change one input at a time to see how sensitive the output is to that assumption.
Important notes
Use effective measured throughput including storage, network and decompression limits. This estimates elapsed duration, not whether recovery objectives or consistency requirements are met.
Frequently asked questions
What formula does the Database Restore Time Estimator use?
Base minutes=data GiB×1024/throughput MiB/s/60; estimate applies the stated overhead percentage.
What should I verify before relying on the result?
Use effective measured throughput including storage, network and decompression limits. This estimates elapsed duration, not whether recovery objectives or consistency requirements are met.
Can I compare different scenarios?
Yes. Change one assumption at a time, keep units and definitions consistent, and save the inputs used for each comparison.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.