# Bytes to MB Data Size Converter

Convert between bytes, KB, MB, GB, TB, and PB. Binary (1024-based) data size converter for files, storage, and memory calculations.

## What this calculates

Convert data sizes between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. This tool uses binary (1024-based) conversion, which is the standard used by operating systems and memory specifications.

## Inputs

- **Value** — min 0 — Enter the data size to convert.
- **From Unit** — options: Bytes (B), Kilobytes (KB), Megabytes (MB), Gigabytes (GB), Terabytes (TB), Petabytes (PB) — Select the source unit.

## Outputs

- **Bytes** (B) — Data size in bytes.
- **Kilobytes** (KB) — Data size in kilobytes (÷ 1024).
- **Megabytes** (MB) — Data size in megabytes (÷ 1024²).
- **Gigabytes** (GB) — Data size in gigabytes (÷ 1024³).
- **Terabytes** (TB) — Data size in terabytes (÷ 1024⁴).

## Details

Data storage is measured in bytes, with each larger unit being 1024 times the previous one in binary notation. This converter uses the binary standard (powers of 1024) that operating systems report.

Binary conversion factors

- 1 Kilobyte (KB) = 1,024 Bytes

- 1 Megabyte (MB) = 1,024 KB = 1,048,576 Bytes

- 1 Gigabyte (GB) = 1,024 MB = 1,073,741,824 Bytes

- 1 Terabyte (TB) = 1,024 GB = 1,099,511,627,776 Bytes

- 1 Petabyte (PB) = 1,024 TB

Quick Reference Table

Bytes
KB
MB
GB

1,024
1
0.001
0.000001

1,048,576
1,024
1
0.001

1,073,741,824
1,048,576
1,024
1

1,099,511,627,776
1,073,741,824
1,048,576
1,024

Note: Storage manufacturers use decimal (1000-based) units (GB = 1,000,000,000 bytes), which is why a "1 TB" drive shows approximately 931 GB in your operating system. This converter uses binary units to match what your OS reports.

## Frequently Asked Questions

**Q: Why does my 1 TB hard drive show less than 1 TB?**

A: Storage manufacturers define 1 TB as 1,000,000,000,000 bytes (decimal), but operating systems calculate 1 TB as 1,099,511,627,776 bytes (binary). So a 1 TB drive shows approximately 931 GB in your OS. This is not missing space; it is a difference in unit definitions.

**Q: What is the difference between MB and MiB?**

A: MB (megabyte) informally means 1,048,576 bytes in computing but officially 1,000,000 bytes in SI. MiB (mebibyte) is the IEC standard term for exactly 1,048,576 bytes. This converter uses the binary (MiB) values, which most people refer to as MB.

**Q: How many MB is 1 GB?**

A: In binary (1024-based) terms, 1 GB equals exactly 1,024 MB. In decimal (1000-based) terms used by drive manufacturers, 1 GB equals 1,000 MB.

**Q: How do I calculate file transfer time?**

A: Divide the file size in megabits (MB × 8) by your connection speed in megabits per second (Mbps). For example, a 100 MB file on a 100 Mbps connection: (100 × 8) / 100 = 8 seconds, not accounting for overhead.

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Source: https://vastcalc.com/calculators/technology/bytes-to-mb
Category: Technology
Last updated: 2026-04-21