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Bandwidth Calculator – Download Time, File Size & Transfer Speed

Bandwidth is the capacity of a network connection to transfer data, typically measured in megabits per second (Mbps) or gigabits per second (Gbps). But file sizes are usually given in megabytes (MB) or gigabytes (GB) — and since there are 8 bits in a byte, confusing the two can throw off transfer time estimates by a factor of 8.

This calculator converts accurately between bits and bytes and computes download or upload time for any file size at any connection speed. It also works in reverse — given a file size and a time target, it tells you the minimum bandwidth needed.

How to use the Bandwidth Calculator

Enter the file size in your preferred unit (MB, GB, TB).

Enter your connection speed in Mbps or Gbps.

View estimated download/upload time.

Or: enter file size and target time to find the required bandwidth.

Download Time by File Size & Connection Speed
File Size	10 Mbps	100 Mbps	1 Gbps	10 Gbps
1 MB	0.8 sec	0.08 sec	< 0.01 sec	< 0.01 sec
1 GB	13.3 min	1.3 min	8 sec	0.8 sec
10 GB	2.2 hrs	13.3 min	1.3 min	8 sec
1 TB	9.3 days	22.2 hrs	2.2 hrs	13.3 min

Bandwidth Calculator FAQ

What is the difference between Mbps and MBps?

Mbps = megabits per second (network speed). MBps = megabytes per second (file transfer speed). 1 MBps = 8 Mbps. ISPs advertise in Mbps; file transfers show in MBps. A 100 Mbps connection transfers data at 12.5 MBps.

Why is my actual download speed slower than my plan speed?

Network congestion, Wi-Fi overhead, server-side limits, routing inefficiency, and protocol overhead all reduce real-world speeds below the theoretical maximum. Expect 70–90% of plan speed under good conditions.

What is latency vs bandwidth?

Bandwidth is how much data can transfer per second. Latency is the delay (ping time) before data starts transferring. High bandwidth with high latency still feels slow for interactive applications like gaming or video calls.

How much bandwidth do common activities need?

HD video streaming: 5–8 Mbps. 4K streaming: 25 Mbps. Video call (HD): 3–5 Mbps. Online gaming: 3–6 Mbps. Most households with 2–4 simultaneous users need 50–100 Mbps for comfortable use.