What is a File Size Converter?
A file size converter is a free online tool that instantly converts digital storage units including Bit, Byte, KB, MB, GB, TB, and PB. Simply enter a number and select a unit to get real-time conversions across all units. It supports both binary (1024-based) and decimal (1000-based) standards, making it easy to compare differences between operating systems and manufacturers.
Key Features
7-Unit Real-Time Conversion
Converts Bit, Byte, KB, MB, GB, TB, and PB simultaneously. Click any result card to instantly switch the base unit.
Binary / Decimal Toggle
Switch between the computer standard (1024-based) and the hard drive manufacturer standard (1000-based) to compare OS differences.
Transfer Time Calculator
Automatically calculates transfer time for 6 connection types: 4G LTE, 5G, WiFi 6, USB 2.0/3.0, and Ethernet.
Storage Capacity Comparison
See how many MP3s, photos, FHD movies, 4K movies, or AAA games fit in the given size — at a glance.
Understanding File Size Units
| Unit | In Bytes | Common Use |
|---|---|---|
| 1 KB | 1,024 B | Text documents, icons |
| 1 MB | 1,048,576 B | MP3 music, high-res photos |
| 1 GB | 1,073,741,824 B | Movies, game installations |
| 1 TB | 1,099,511,627,776 B | Large backups, NAS storage |
| 1 PB | 1,125,899,906,842,624 B | Data centers, cloud storage |
* Computers use binary system where 1KB = 1,024B. (Hard drive manufacturers often use 1,000-based calculation)
How to Use File Size Converter
- Select Unit — Choose the file size unit from Bit, Byte, KB, MB, GB, TB, or PB.
- Enter Value — Type the number you want to convert. Use quick select buttons for common values.
- View Results — See automatic conversions to all units. Click any unit to change the base.
- Toggle Binary/Decimal — Switch between binary (1024-based) and decimal (1000-based) to compare OS differences.
Use Cases
Cloud Storage Planning
Calculate storage capacity for Google Drive, iCloud, Dropbox, and other cloud services to track remaining space.
File Transfer Time
Estimate download/upload time based on file size and internet speed.
Web Optimization
Analyze image and script file sizes for web pages to optimize loading speed.
Server & Storage Management
Perform unit conversions for server disk planning, NAS storage configuration, and backup capacity estimation.
FAQ
Q. How many MB is 1GB?
1GB equals 1,024MB. Computers use binary (base-2), so calculations are based on 1,024 (2^10) rather than 1,000.
Q. How many GB is 1TB?
1TB equals 1,024GB. Terabytes are commonly used for large hard drives and cloud storage.
Q. Why does my hard drive show less space than advertised?
Hard drive manufacturers calculate 1GB = 1,000MB, while operating systems (Windows) use 1GB = 1,024MB. This difference causes the displayed capacity to appear smaller.
Q. What's the difference between KB and KiB?
KB (kilobyte) is 1,000 bytes, while KiB (kibibyte) is 1,024 bytes. This tool uses the 1,024-based calculation commonly used in computing.
Privacy Notice
This file size converter performs all calculations entirely within your browser. No data is sent to any server, and no information is stored or collected. Use with complete confidence.