Data Transfer Time Calculator
Estimate a transfer
Enter the amount of data and the sustained transfer speed.
Advanced: sustained efficiency
Keep 100% when entering an observed transfer speed. Reduce it only when starting from theoretical link capacity.
Estimated duration
2 hours, 13 minutes, 20 seconds
About this tool
Estimate how long a data transfer will actually take, given its size and your link's sustained speed — accounting for real-world overhead that back-of-envelope math usually ignores.
Enter the transfer size (MiB up to PiB) and your connection's rated speed (Mbps up to Tbps); the calculator converts both to a common bytes-per-second basis and computes duration. An optional efficiency percentage lets you discount the rated link speed for protocol overhead, contention, or a known-achievable ceiling — a 10 Gbps link rarely sustains 10 Gbps of actual payload once TCP/IP, encryption, and replication-protocol overhead are accounted for, and this is where that correction belongs instead of guessing at the final duration.
Common uses: sizing a maintenance window for a SnapMirror baseline transfer, estimating how long a bulk migration to a new array will take before committing to a cutover date, or sanity-checking whether a stated transfer SLA is achievable on the link actually available.
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