MB GB KB Converter
Convert MB, GB, KB, bytes, KiB, MiB, and GiB for file size, storage, data plans, and examples like 1000 MB to GB.
Common conversions
Decimal vs Binary Units
Decimal (SI Units)
Used by storage manufacturers. Based on powers of 1000.
- 1 KB = 1,000 bytes
- 1 MB = 1,000 KB = 1,000,000 bytes
- 1 GB = 1,000 MB = 1,000,000,000 bytes
- 1 TB = 1,000 GB
Binary (IEC Units)
Used by operating systems. Based on powers of 1024.
- 1 KiB = 1,024 bytes
- 1 MiB = 1,024 KiB = 1,048,576 bytes
- 1 GiB = 1,024 MiB = 1,073,741,824 bytes
- 1 TiB = 1,024 GiB
Why does my drive show less space? A "1 TB" drive (1,000,000,000,000 bytes) shows as ~931 GiB in your OS because it uses binary calculation.
Common File Sizes
Convert data size units such as MB, GB, KB, bytes, KiB, MiB, and GiB. Use quick examples like 1000 MB to GB, 1 MB to KB, and 1 GB to MB.
MB GB KB Converter
MB GB KB Converter
Convert MB, GB, KB, bytes, KiB, MiB, and GiB for file size, storage, data plans, and examples like 1000 MB to GB.
When to use it
When to use it
File size checks
Convert attachment, upload, and download limits.
Storage planning
Compare phone, SSD, USB, and cloud storage capacity.
Data plans
Estimate how much MB or GB a plan uses.
How conversion works
How conversion works
The calculator uses decimal powers of 1000 and binary powers of 1024.
Data Comparison Table
Data Comparison Table
| Unit | Decimal (Base 10) | Binary (Base 2) |
| Kilobyte | 1,000 Bytes | 1,024 Bytes (KiB) |
| Megabyte | 1,000,000 Bytes | 1,048,576 Bytes (MiB) |
| Gigabyte | 10^9 Bytes | 2^30 Bytes (GiB) |
Developer Friendly
Developer Friendly
Uses BigInt support in modern browsers for accurate large-scale conversions (PB, EB).