# Data Size Unit Conversion Without the KB and KiB Confusion

Convert between bits, bytes, and the decimal SI prefixes KB, MB, GB, TB plus the binary IEC prefixes KiB, MiB, GiB, TiB with the system of every number pinned down before you calculate.

> Canonical page: https://elysiatools.com/en/hubs/data-size-unit-conversion

- **Keywords:** KB to KiB conversion, GB to GiB difference, bits to megabytes, bytes to MB converter, TB decimal or binary, data size unit calculator

## Frequently asked questions

### Why does a 1 TB drive show only 931 GB in the system?

The vendor means the decimal terabyte of one trillion bytes, while the operating system displays binary tebibytes, and one trillion bytes is about 931 TiB-styled units. Convert through the TiB bridge and the missing space reappears as arithmetic, not as loss.

### How long does a 100 Mbps connection take to download 1 GB?

One hundred megabits per second is 12.5 megabytes per second after the factor of eight, so a decimal gigabyte takes about 80 seconds in theory, and protocol overhead makes real transfers noticeably slower.

### What is the difference between KB and KiB?

KB in the decimal SI sense is 1000 bytes and KiB in the binary IEC sense is 1024 bytes, a 2.4 percent gap that grows with each prefix step — about 10 percent between TB and TiB — which is exactly why the IEC names exist.

### Which converters should I use for log file sizes?

Logs and APIs report raw bytes, so run the bytes-to-KB or bytes-to-MB direction for reading, keep the convention in mind when the platform documentation quotes limits in binary units, and convert back to bytes when a script compares against a byte quota.

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