The basics
- 8 Kilobits (Kb) = 1 Kilobyte (KB)
8 Megabits (Mb) = 1 Megabyte (MB)
KB and MB are measurements of data file sizes and storage. - Kbps and Mbps are short for "Kilobits per second" and "Megabits per second" and are measurements of data transfer rates (also known as connection speed).
- To estimate how long it would take to download a large file based upon your connection speed, you can use the following simple mathematical equation:(Convert file size to Mb) / coneection speed (in Mbps) = # of seconds to complete download.
So if your connection speed is 16 Mbps then, then you could theoretically download a 2 MB file, such as a high-resolution digital photo, in approximately one second.
(2 MB x 8 Mb) / 16 Mbps = 1 second
Instructions: Our calculator measures the estimated time needed to download a file at different connection speeds. Simply type in the file size in the field below and choose a measurement unit. The fields below will automatically populate with estimated download times *based on connection speed.
KB(Kilobytes)
MB (Megabytes)
GB (Gigabytes)
TB (Terabytes)
Connection | Capacity | Time |
---|---|---|
33.6 K (Modem) | 33,600 bps | 41 mins, 36 secs |
56 K (Modem) | 56,000 bps | 24 mins, 57 secs |
64 K (DS-0) | 64,000 bps | 21 mins, 50 secs |
128 K (ISDN) | 128,000 bps | 10 mins, 55 secs |
256 K (DSL) | 256,000 bps | 5 mins, 27 secs |
640 K (DSL/Cable) | 640,000 bps | 2 mins, 11 secs |
768 K (DSL/Cable) | 768,000 bps | 1 min, 49 secs |
T1, DS-1 | 1.544 Mbps | 54 secs |
T3, DS-3 | 44.736 Mbps | 1 sec |
OC-1 | 51.840 Mbps | 1 sec |
OC-3 | 155.520 Mbps | Less than a second. |
OC-12 | 622.520 Mbps | Less than a second. |
OC-48 | 2.488 Gbps | Less than a second. |
OC-192 | 10Gbps | Less than a second. |
*Note: these calculations assume a "perfect" connection at the stated speed. Actual performance will vary due to retries, latency, transmission protocol requirements, and other concurrent traffic.
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