File Size Calculator
Calculates file size from video and audio bitrate.
Supports estimation from recommended bitrate and unit conversion.
📋 Presets (Platform Recommended)
📊 Size Comparison
About
An online tool that instantly converts between file size units (B/KB/MB/GB/TB). Just enter any size and it will automatically convert and display the equivalents in all units.
Quickly and accurately calculate file sizes for estimating storage capacity, checking file upload limits, predicting traffic volumes, and more. Compatible with both SI standards (1000) and binary standards (1024).
All processing is performed directly in your browser. No data is sent to a server. You can use it instantly with no registration required.
How to Use
Enter size and unit
Enter the number and select the original unit (B/KB/MB/GB/TB).
Check the conversion result
As soon as you input, all units will be automatically converted and the results will be displayed.
Copy the results
You can click on the required number to copy it to the clipboard.
Glossary
- Kilobyte (KB) / Kibibyte (KiB)
- A unit of digital data. Storage manufacturers label 1KB as 1,000 bytes, while Operating Systems (like Windows) calculate 1KiB as 1,024 bytes. Our tool uses the standard 1,024-base (JEDEC) convention.
- Megabyte (MB)
- Equal to 1,024 KB. Frequently used to express the size of high-res photos (e.g., 3MB) or an MP3 song (e.g., 5MB).
- Gigabyte (GB)
- Equal to 1,024 MB. The most common unit for evaluating smartphone storage (64GB, 128GB) or HD video sizes.
- Terabyte (TB)
- Equal to 1,024 GB. The modern standard for measuring desktop external hard drives, SSDs, and typical cloud storage subscriptions.
- Petabyte (PB)
- Equal to 1,024 TB. Massive data scale primarily used in enterprise data centers, cloud infrastructure, and supercomputing.
- Data Transfer Rate
- The speed at which data travels from one location to another, typically measured in Megabits per second (Mbps). Not to be confused with file size (Megabytes - MB).
- Formatting Overhead
- The storage space consumed by the file system structure itself. This is why a "1TB" hard drive rarely gives you exactly 1TB of usable space.
FAQ
- Q. Is 1KB equal to 1000 bytes or 1024 bytes?
- The SI standard (International System of Units) defines it as 1000 bytes, while the binary standard (computers) defines it as 1024 bytes. This tool supports both systems.
- Q.Why does my 1TB hard drive show up as only 931GB on Windows?
- Manufacturers market 1TB as exactly 1,000,000,000,000 bytes. However, Windows calculates 1GB as 1,024^3 bytes. 1,000,000,000,000 divided by 1,024^3 equals exactly 931.32GB. Our tool helps calculate these discrepancies.
- Q.Are you using the base-10 or base-2 calculation?
- This tool uses the traditional base-2 system (1KB = 1024 Bytes), which aligns exactly with how Windows memory and file sizes are displayed.
- Q.Can it convert petabytes or larger?
- Yes. The calculator handles conversions all the way up to Yottabytes (YB) effortlessly.
- Q.Do decimals work in the input?
- Yes. You can input values like 1.5GB or 0.25TB, and the converter will perfectly output the mathematically exact equivalents in MB, KB, or Bytes.
- Q. Is data sent to a server?
- No. All processing is completed exclusively within your browser. Nothing is sent to external servers.
- Q. What is the decimal precision level?
- Calculations are done with sufficient decimal precision, supporting both very large and extremely small fractional numbers accurately.
- Q.How do I figure out the download time for my file size?
- Multiply the size in Megabytes (MB) by 8 to get Megabits (Mb). Then divide by your internet speed (Mbps) to estimate the time in seconds.
Use Cases
Storage capacity calculation
Check the remaining capacity of the cloud or local disk and decide whether to save files.
Check upload restrictions
Compare the file upload size limit (e.g. 25MB) with the actual file size.
Estimating traffic volume
Calculate the amount of data for file transfers and API communications, and estimate bandwidth and transfer time.
Report creation
Used for conversion when expressing data capacity in appropriate units for teams and clients.