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Data Size Converter

Convert data sizes between bytes, KB, MB, GB, TB, and PB. Understand disk space and file sizes in different units. Input never leaves your device — everything runs locally in your browser.

100% Local Browser Native

How to Use the Data Size Converter

1. Fill the inputs

Enter the size with from- and to-units.

2. Read the converted size

Check the converted size with unit math.

3. Compare scenarios

Save both outputs before deciding — side-by-side numbers beat memory.

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Frequently Asked Questions

How many megabytes are in a gigabyte?

1 GB = 1,024 MB. This tool uses binary (base-1024) conventions, which is standard for computing and file systems.

Why 1024 instead of 1000?

Computers use binary addressing, so memory and storage are measured in powers of 2. 1 KB = 2^10 = 1,024 bytes. The decimal convention (1 KB = 1000 B) is used by some hard drive manufacturers.

How many bytes are in a text email?

A typical plain-text email is about 10 KB (10,240 bytes). With images or attachments, it can be much larger.

How big is an HD movie file?

A typical HD movie is about 4–5 GB. A 4K movie can be 15–25 GB depending on length and compression.

When using Data Size Converter, does this converter work offline?

Yes. All conversions run locally in your browser. No data is uploaded.

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Last updated October 2026