Skip to main content
conversion

Byte Conversion Calculator

Convert between data storage units: bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), and terabytes (TB). Supports both binary (1024-based) and decimal (1000-based) conventions.

Reviewed by Christopher FloiedPublished Updated

This free online byte conversion calculator provides instant results with no signup required. All calculations run directly in your browser — your data is never sent to a server. Enter your values below and see results update in real time as you type. Perfect for everyday calculations, homework, or professional use.

Minimum: 0

The numeric value to convert

Select the source unit (binary, 1024-based)

Results

Bytes (B)

1e+9 B

Kilobytes (KB)

1.0486e+6 KB

Megabytes (MB)

1024 MB

Gigabytes (GB)

1 GB

Terabytes (TB)

9.765625000e-4 TB

How to Use This Calculator

1

Enter your input values

Fill in all required input fields for the Byte Conversion Calculator. Most fields include unit selectors so you can work in your preferred unit system — metric or imperial, whichever matches your problem.

2

Review your inputs

Double-check that all values are correct and that you have selected the right units for each field. Incorrect units are the most common source of calculation errors and can produce results that are off by factors of 2, 10, or more.

3

Read the results

The Byte Conversion Calculator instantly computes the output and displays results with units clearly labeled. All calculations happen in your browser — no loading time and no data sent to a server.

4

Explore parameter sensitivity

Try adjusting individual input values to see how the output changes. This is a quick and effective way to develop intuition about how different parameters influence the result and to identify which inputs have the largest effect.

When to Use This Calculator

  • •Use the Byte Conversion Calculator when you need accurate results quickly without the risk of manual computation errors or unit conversion mistakes.
  • •Use it to verify calculations made by hand or in spreadsheets — an independent check can catch errors before they lead to costly decisions.
  • •Use it to explore how changing input parameters affects the output — a quick way to develop intuition and identify the most influential variables.
  • •Use it when collaborating with others to ensure everyone is working from the same numbers and applying the same assumptions.

Related Calculators

Data Storage Converter

Convert data storage sizes between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Supports both decimal (SI) and binary (IEC) interpretations. Useful for computing, file management, bandwidth planning, and storage capacity calculations.

Speed Converter

Convert speed and velocity values between meters per second, kilometers per hour, miles per hour, knots, feet per second, and Mach number. Supports both metric and imperial speed units for physics, aviation, and everyday use.

Density Conversion Calculator

Convert between common density units: kg/m3, g/cm3, g/mL, lb/ft3, and kg/L. Enter a density value and source unit to see all equivalent values.

Energy Conversion Calculator

Convert between common energy units: joules (J), kilojoules (kJ), calories (cal), kilocalories (kcal), British thermal units (BTU), kilowatt-hours (kWh), and electronvolts (eV).

Power Conversion Calculator

Convert between common power units: watts (W), kilowatts (kW), megawatts (MW), horsepower (hp), BTU per hour (BTU/hr), and foot-pounds per second (ft-lb/s).

Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine scales. Enter a temperature value and select the source and target units to get an accurate conversion with the underlying formula displayed for reference.

About Byte Conversion Calculator

The Byte Conversion Calculator converts between common data storage units using the binary (base-1024) convention used by operating systems and memory manufacturers. Whether you are sizing cloud storage, estimating download times, or interpreting file sizes, understanding the relationships between bytes, kilobytes, megabytes, gigabytes, and terabytes is essential. This calculator displays all five units simultaneously for any input value. Note that this uses the binary convention (1 KB = 1024 bytes) commonly used by operating systems, which differs from the decimal convention (1 KB = 1000 bytes) used by hard drive manufacturers and network speed specifications.

The Math Behind It

Data storage is measured in bytes, where one byte equals 8 bits. Historically, the prefixes kilo-, mega-, giga- were borrowed from the metric system but applied with a factor of 1024 (2^10) instead of 1000. This binary convention became standard because computer memory is organised in powers of 2. The confusion between binary and decimal conventions has led to the IEC standard introducing distinct prefixes: kibibyte (KiB = 1024 bytes), mebibyte (MiB = 1024^2), gibibyte (GiB = 1024^3), and tebibyte (TiB = 1024^4). Despite this standard, the industry remains split: operating systems (Windows, macOS, Linux) use binary but label it KB/MB/GB, while storage manufacturers and networking use decimal. The discrepancy grows with size. A '1 TB' hard drive contains 1,000,000,000,000 bytes (decimal), which an operating system reports as approximately 931 GB (binary). This 7% difference often surprises consumers. At the petabyte scale, the gap reaches nearly 13%. Common reference points: a plain text character is 1 byte, an average email is 50-100 KB, a smartphone photo is 2-5 MB, an HD movie is 4-8 GB, and a complete operating system installation is 20-50 GB. Network speeds use bits per second (bps), not bytes per second. To convert between them, divide bits by 8. A 100 Mbps connection can transfer at most 12.5 MB/s (megabytes per second, decimal) or about 11.9 MiB/s (mebibytes per second, binary). Cloud storage pricing and limits are typically specified in the binary convention (GiB), though marketing materials may use 'GB' ambiguously.

Formula Reference

Binary Byte Conversion

bytes = value * 1024^exponent

Variables: value = numeric input, exponent = 0 (B), 1 (KB), 2 (MB), 3 (GB), 4 (TB)

Worked Examples

Example 1: Convert 1 GB to Other Units

How many bytes, KB, MB, and TB are in 1 GB (binary)?

Step 1:1 GB = 1 * 1024^3 = 1,073,741,824 bytes
Step 2:In KB: 1,073,741,824 / 1024 = 1,048,576 KB
Step 3:In MB: 1,073,741,824 / 1024^2 = 1,024 MB
Step 4:In TB: 1,073,741,824 / 1024^4 = 0.0009766 TB

1 GB = 1,073,741,824 bytes = 1,048,576 KB = 1,024 MB = ~0.000977 TB.

Example 2: How Big is 500 MB in GB?

Convert 500 MB to GB using binary convention.

Step 1:500 MB = 500 * 1024^2 = 524,288,000 bytes
Step 2:In GB: 524,288,000 / 1024^3 = 0.4883 GB

500 MB is approximately 0.4883 GB.

Common Mistakes & Tips

  • !Confusing binary (1024-based) and decimal (1000-based) conventions. A '1 TB' drive uses decimal and shows as ~931 GB on your computer which uses binary.
  • !Confusing bits and bytes. Network speeds are in bits per second, while file sizes are in bytes. Divide bits by 8 to get bytes.
  • !Assuming all 'KB' labels mean the same thing. Depending on context, KB may mean 1024 bytes (binary, OS usage) or 1000 bytes (decimal, storage marketing).

Related Concepts

Binary Converter

Converts decimal numbers to binary representation, the foundation of how data is stored as bits and bytes.

IEC Binary Prefixes

Standardised prefixes (KiB, MiB, GiB, TiB) that unambiguously refer to powers of 1024, introduced to resolve confusion with metric prefixes.

Used in These Calculators

Calculators that build on or apply the concepts from this page:

Bandwidth Calculator

Download Time Calculator

RAID Calculator

Unix Timestamp Converter

Frequently Asked Questions

Why does my 1 TB hard drive show less than 1 TB on my computer?

Hard drive manufacturers use the decimal convention: 1 TB = 1,000,000,000,000 bytes. Your operating system uses the binary convention: 1 TB = 1,099,511,627,776 bytes. The drive's 1 trillion bytes equals approximately 931 GB in binary terms.

What is the difference between bits and bytes?

One byte equals 8 bits. Bits are used for data transmission speeds (e.g., 100 Mbps internet), while bytes are used for storage sizes (e.g., 500 MB file). To convert Mbps to MB/s, divide by 8.

Should I use binary or decimal for my calculations?

Use binary (1024) for RAM, OS-reported file sizes, and programming. Use decimal (1000) for hard drive capacities, SSD marketing specs, and network bandwidth. This calculator uses the binary convention.

Embed this calculator on your site

Paste this snippet into your blog, course page, or documentation to drop a live, interactive Byte Conversion Calculator into your page.

Free to embed — includes a link back to MegaCalc.