GB/MB/TB converter
Convert a data amount between megabytes, gigabytes and terabytes — switch the unit dropdown to enter your value in whichever unit you have.
Result
In megabytes (MB)
In gigabytes (GB)
In terabytes (TB)
How to use this calculator
- Enter an amount and switch the unit dropdown to match what you're converting from.
- Read the equivalent in the other two units.
Assumptions
- Uses decimal (1000-based) prefixes, as used by storage manufacturers and mobile data plans — operating systems sometimes instead use binary (1024-based) prefixes internally, which gives a slightly different-looking free-space figure.
Technical details: what the fields mean
- Amount
amount - Data amount — use the unit dropdown to enter it in MB, GB or TB.
Methodology
Uses decimal (1000-based) prefixes — 1000MB = 1GB, 1000GB = 1TB — matching how storage and data plans are typically advertised.
Worked example
2.5GB
Inputs: amount=2.5 (unit: gb)
Result: 2500.00 MB, 2.5000 GB, 0.002500 TB
Practical guidance
- If a file manager or operating system shows a slightly different number than expected, it may be using 1024-based (binary) units internally rather than the 1000-based (decimal) units used here and by most storage/data-plan marketing.
Common mistakes
- Assuming 1GB always equals exactly 1024MB — that's the binary convention some operating systems use internally; storage and data plans are usually sold using the 1000-based decimal convention used here.
FAQs
How many MB is 1GB?
1000MB, using the standard decimal convention used for storage and data plans (some operating systems instead show 1024MB internally).