Data storage unit converter
Convert bytes, MB/GB, and binary units correctly.
Your inputs
Your results
Ready when you areYour results will appear here.
How it works
Convert a quantity to bytes and then into decimal storage prefixes, binary storage prefixes and bits using explicit unit definitions.
Read the source reference ↗A few things to know
This is unit arithmetic, not a measurement of usable disk capacity, filesystem overhead or compressed file size. Fractional bytes are allowed as mathematical equivalents.
When to use this tool
Use explicit decimal and binary prefixes instead of treating MB and MiB as synonyms. Both are valid units with different multipliers.
- Compare storage displays.
- Convert a file-size figure.
- Explain binary prefixes.
How to use data storage unit converter
Prepare the inputs
Enter the quantities and units used by your source.
Choose the settings
Choose the assumptions and compare them with your actual situation.
Review and export
Review the result, then download the calculation report.
Try the supplied example
Inputs
size: 1; unit: GB
Result
One GB equals 1,000,000,000 bytes, about 0.931323 GiB.
What it means
Advertised capacity and an operating system’s display can use different unit conventions.
Common mistakes to avoid
GB and GiB have different multipliers
GB and GiB have different multipliers.
Unit conversion does not recover filesystem overhead
Unit conversion does not recover filesystem overhead.
Frequently asked questions
Definitions, edge cases, and practical next steps for this tool. Search all tool FAQs ↗
How many bits are in a byte?
Eight.
What does GB mean here?
One billion bytes, using the decimal prefix.
What does GiB mean?
1,073,741,824 bytes, using a binary prefix.
Does this account for formatting overhead?
No. It converts units only.
Can I enter fractional sizes?
Yes. Results are mathematical equivalents and may include fractional bytes.
Does this compress data?
No. It performs unit arithmetic.
Are my inputs uploaded or stored?
Processing happens locally in your browser. This tool does not upload inputs. Downloads stay on your device; sharing or opening them in another service is your choice.
What should I check before using the output?
This is unit arithmetic, not a measurement of usable disk capacity, filesystem overhead or compressed file size. Fractional bytes are allowed as mathematical equivalents.
Explore the topic in the blog
Sources and method
Use the references below to check definitions and platform guidance. The model’s scope and limits are explained above. Read our editorial standards.