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Data migration time calculator

Estimate migration duration from data volume, throughput and an effective utilization percentage.

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Data volumeUnitThroughput MbpsUtilization %

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How to use it

Estimate continuous migration time from data volume, network throughput and an effective utilization percentage. It is an early planning calculator for questions such as “roughly how many hours or days would this transfer take?”

Enter the data volume and choose TB or GB.
Enter throughput in Mbps and an effective utilization above 0% up to 100%.
Use the seconds, hours and days as a planning estimate rather than a guaranteed completion time.

Capacity: Decimal storage units
Throughput: Mbps
Utilization: >0% to 100%
Assumption: Continuous transfer at the same effective rate

5 TB at 500 Mbps and 70% utilization is about 31.7 hours

A 70% utilization factor treats 500 Mbps as roughly 350 Mbps effective throughput, producing about 31.7 hours or 1.32 days for 5 TB.

Real migrations also involve retries, encryption, storage I/O, concurrency, maintenance windows and delta synchronization. Do not treat the estimate as a promised finish time.

Utilization bridges the gap between link speed and observed speed

A nominal 500 Mbps path rarely sustains that exact rate for every workload. At 70%, the estimate uses 350 Mbps as the effective transfer rate.

Capacity uses decimal units

The calculation follows decimal GB/TB conventions commonly used for network and storage planning. A GiB/TiB-based estimate will differ slightly.

The result is continuous transfer time

If migration is allowed only during nightly windows, convert the total hours into the number of available work windows yourself.

Many small files can take longer than the bandwidth math suggests

Metadata operations, authentication, per-file overhead and retries can reduce real throughput even when the link itself is fast.

Use a test transfer to improve the estimate

Once you have observed throughput from a representative sample, update the utilization assumption and keep contingency time in the project plan.

Related references: Digital storage units · SI prefixes & units