Guide
How Data Storage Conversions Work
Data storage conversions move file sizes up or down between KB, MB, GB, and TB. The practical challenge is that software and storage vendors do not always display units with the same convention.
Moving Between Units
When moving to a larger data unit, divide by 1,024. For example, MB to GB divides by 1,024.
When moving to a smaller data unit, multiply by 1,024. For example, GB to MB multiplies by 1,024.
- KB to MB divides by 1,024.
- MB to GB divides by 1,024.
- TB to GB multiplies by 1,024.
Why Numbers Can Look Different
Many computing contexts use powers of 1,024. Some storage vendors and product labels use decimal steps of 1,000. Operating systems may also reserve space for formatting and system files.
That means a drive, phone, or cloud plan can show a different number than expected even when nothing is wrong.
How to Use the Calculators
Use KB to MB for smaller files and attachments, MB to GB for larger downloads and folders, GB to MB when a limit is in GB but files are in MB, and TB to GB for drive or cloud storage comparisons.
Keep the convention consistent when comparing values. If a vendor publishes a specific unit policy, use that policy for exact billing or capacity decisions.
Conversion Direction
Smaller to larger
Larger Unit = Smaller Unit / 1024
Use division when moving from KB to MB or MB to GB.
Larger to smaller
Smaller Unit = Larger Unit x 1024
Use multiplication when moving from TB to GB or GB to MB.
Worked Examples
MB to GB
- Input
- 10,240 MB
- Formula
- 10240 / 1024
- Output
- 10 GB
Moving from MB to GB uses division.
GB to MB
- Input
- 25 GB
- Formula
- 25 x 1024
- Output
- 25,600 MB
Moving from GB to MB uses multiplication.
TB to GB
- Input
- 4 TB
- Formula
- 4 x 1024
- Output
- 4,096 GB
Drive and cloud storage tiers are often easier to compare in GB.
Frequently Asked Questions
Do I multiply or divide for storage conversions?
Divide when moving to a larger unit, such as MB to GB. Multiply when moving to a smaller unit, such as GB to MB.
Why does Calculastic use 1,024?
The data calculators use the common 1,024-based computing convention and state that assumption clearly.
Why do vendors sometimes use 1,000?
Decimal labeling is common in storage marketing and some product specifications. That can differ from how some software displays capacity.
Which calculator should I use for a file folder?
Use MB to GB when the folder total is in megabytes and you want to compare it with gigabyte storage limits.
Can this explain exact usable drive space?
Not completely. Usable space can also be affected by formatting, file systems, operating-system files, and vendor conventions.
Related calculators and guides
Continue with the calculator or guide that matches the next decision.