Why is my download 8× slower than my plan?

It is not — units differ. A 100 Mbps plan delivers 12.5 MB/s. Divide bits by 8 to get bytes.

Lowercase b (Mb) is bits, uppercase B (MB) is bytes. Marketing uses bits because the numbers look 8× bigger.

1000 or 1024 per kilo?

Networking uses decimal 1000 (SI). The 1024 convention belongs to RAM/storage addressing (KiB/MiB).

Data Transfer Rate Converter

Convert network and transfer rates between bits and bytes at kilo/mega/giga scales.

Convert internet and transfer speeds instantly. Free Mbps to MB/s, Gbps, Kbps converter with bits vs bytes explained.

About Data Rates

Convert network and transfer rates between bits and bytes at kilo/mega/giga scales.

ISPs advertise bits (Mbps) while browsers download in bytes (MB/s) — exactly 8× apart, which is why "100 megabit" internet downloads at ~12.5 megabytes per second. SI decimal prefixes apply throughout networking (unlike 1024-based storage).

Real throughput runs ~10% below line rate after protocol overhead. Everything runs in your browser.

Where it is used

Translating ISP Mbps into real download MB/s, sizing backups and transfers, and reading speed tests correctly.

How to use the Data Rates

Value — enter the value (e.g. 100).
From — enter the value.
To — enter the value.
Calculate — press the Calculate button to see the result instantly above.

Formula

Anchor to bits/sec (SI decimal: 1 Mbps = 1,000,000 bps; 1 byte = 8 bits).

Examples

Example

value:100

from:Mbps

to:MB-s

Result: 100 Mbps = 12.5 MB/s

Frequently Asked Questions

Why is my download 8× slower than my plan?: It is not — units differ. A 100 Mbps plan delivers 12.5 MB/s. Divide bits by 8 to get bytes.
Megabit vs megabyte?: Lowercase b (Mb) is bits, uppercase B (MB) is bytes. Marketing uses bits because the numbers look 8× bigger.
1000 or 1024 per kilo?: Networking uses decimal 1000 (SI). The 1024 convention belongs to RAM/storage addressing (KiB/MiB).

Calculator Inputs