Bits vs Bytes

Data transfer rates are quoted in bits per second (bps) — 100 Mbps, 1 Gbps — while file sizes are quoted in bytes (MB, GB). Because 1 byte = 8 bits, divide by 8 to convert: 100 Mbps = 12.5 MB/s. This data transfer rate calculator converts between every common unit and estimates transfer time for real files.

Estimating Transfer Time

Time = File size in bits ÷ Rate in bps. A 5 GB file at 100 Mbps takes 400 seconds. In practice, TCP/IP overhead, Wi-Fi retransmissions, and server limits cut throughput by 5–20%, so budget extra time for large transfers and cloud syncs.

Choosing a Connection

Streaming HD needs ~5 Mbps, 4K needs ~25 Mbps per stream. Video calls use 2–4 Mbps. Cloud backups of 100 GB at 100 Mbps take over 2 hours; at 1 Gbps, under 15 minutes. Match your plan to simultaneous users, resolution, and upload needs — not just the headline download number.