Unit Converters

Data Converter

Convert between bytes, KB, MB, GB, TB, and PB instantly. Free to use, no sign-up.

Did this calculator help you?

What is Data Converter?

A data converter transforms measurements between different digital storage units, including bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and beyond. Whether you're managing file sizes, comparing storage plans, or understanding internet speeds, accurate data unit conversions are essential in our digital world. Digital storage uses two measurement systems: the decimal system (base 10, used by storage manufacturers) and the binary system (base 2, used by operating systems). This difference explains why a 500 GB hard drive shows only about 465 GB in your computer. Understanding these conversions helps you make informed decisions about storage purchases and data management.

When to Use This Calculator

  • When understanding the actual usable capacity of hard drives, SSDs, USB drives, and SD cards
  • When comparing cloud storage plans that may use different unit definitions (GB vs GiB)
  • When estimating download or upload times based on file size and internet connection speed
  • When managing disk space and organizing files across multiple storage devices
  • When converting between binary (MiB, GiB) and decimal (MB, GB) units for accurate computing
  • When checking file size compatibility with email attachment limits or cloud storage quotas

Steps:

  1. Select the source data unit.
  2. Select the target data unit.
  3. Enter the value to convert.
  4. View the converted result.
  5. See equivalent values in all available units.

Formula

Binary (used by OS): 1 KB = 1,024 bytes 1 MB = 1,024 KB = 1,048,576 bytes 1 GB = 1,024 MB = 1,073,741,824 bytes 1 TB = 1,024 GB Decimal (used by manufacturers): 1 KB = 1,000 bytes 1 MB = 1,000 KB 1 GB = 1,000 MB 1 TB = 1,000 GB

Use Cases

  • Understanding actual storage capacity of hard drives, SSDs, USB drives, and memory cards
  • Comparing cloud storage plan sizes
  • Estimating download and upload times based on file size and internet connection speed
  • Managing disk space and organizing file storage
  • Converting between binary units (MiB, GiB) and decimal units (MB, GB) for accurate computing
  • Checking file size compatibility with email attachment limits and cloud storage quotas

Key Benefits

  • Convert instantly between bytes, KB, MB, GB, TB, and PB
  • Understand file sizes in any format, binary or decimal
  • Handle both binary and decimal storage definitions without confusion
  • Plan storage purchases and cloud plans with precise calculations

Pro Tips

  • Remember that 1 GB (advertised) equals about 0.93 GiB (what your OS actually shows)
  • Use binary units (KiB, MiB, GiB) when working with RAM and system memory calculations
  • Use decimal units (KB, MB, GB) when working with storage device capacities and manufacturer specs
  • When comparing cloud storage or download times, double-check whether the provider is quoting bits (Mbps) or bytes (MB)

Common Mistakes to Avoid

  • Confusing decimal GB (base-10, used by manufacturers) with binary GiB (base-2, used by operating systems)
  • Assuming a drive's advertised capacity matches what the OS reports — a 500 GB drive shows only about 465 GiB
  • Mixing up bits and bytes — there are 8 bits per byte, so a 100 Mbps connection downloads at about 12.5 MB per second, not 100 MB per second

Key Terms Explained

Byte: A unit of digital storage equal to 8 bits, the standard unit for measuring file sizes
Gigabyte (GB): A decimal unit equal to 1 billion bytes, used by storage manufacturers
Gibibyte (GiB): A binary unit equal to 1,073,741,824 bytes, used by most operating systems
Bit: The smallest unit of data, representing a single 0 or 1

Related Concepts

Example

A 4K movie file of 15 GB equals 15,360 MB or 15,728,640 KB. In binary terms, it's approximately 13.97 GiB. A USB drive advertised as 64 GB actually provides about 59.6 GiB of usable space in your operating system.

Interpreting Your Results

The converter handles both decimal units (used by storage manufacturers: KB = 1,000 bytes, MB = 1,000 KB, GB = 1,000 MB) and binary units (used by operating systems: KiB = 1,024 bytes, MiB = 1,024 KiB, GiB = 1,024 MiB). This distinction is why a 500 GB hard drive shows only about 465 GiB in your operating system. When comparing values, always check which unit system is being used. Internet speeds are typically advertised in bits per second (Mbps), while file sizes use bytes (MB). A 100 Mbps connection downloads at about 12.5 MB per second, not 100 MB. The formula section shows the exact conversion math for both systems.

Frequently Asked Questions

Why does my hard drive show less space than advertised?
Manufacturers use decimal (1 GB = 1 billion bytes) while operating systems use binary (1 GiB = 1,073,741,824 bytes). A 1 TB drive shows about 931 GiB in Windows.
What's the difference between bits and bytes?
A byte is 8 bits. Internet speeds are measured in bits per second (Mbps), while file sizes are in bytes (MB). A 100 Mbps connection downloads about 12.5 MB per second.
How much data can a typical storage device hold?
A standard DVD holds 4.7 GB, a dual-layer Blu-ray holds 50 GB, USB flash drives range from 8 GB to 512 GB, and modern hard drives range from 500 GB to 20 TB. Cloud storage plans typically offer from 5 GB free to unlimited storage for a fee.
Why does my 1TB drive show only 931GB?
Manufacturers define 1 TB as 1,000,000,000,000 bytes (decimal), but Windows uses binary where 1 TB = 1,099,511,627,776 bytes. So your drive has about 931 GiB of usable space. This is a universal discrepancy across all storage devices, not a defect — it's simply different unit definitions.
What's the difference between Mbps and MB/s?
Bits (b) and bytes (B) are different units: 1 byte = 8 bits. Internet speeds are measured in megabits per second (Mbps), while file sizes are in megabytes (MB). A 1000 Mbps (1 Gbps) connection downloads at 125 MB/s. Always divide by 8 to convert from bits to bytes.
How long will it take to download a 50GB file?
At 100 Mbps: about 67 minutes. At 500 Mbps: about 13 minutes. At 1 Gbps: about 6.7 minutes. Formula: file size in GB x 8 / speed in Mbps = time in seconds. Divide by 60 for minutes. This assumes maximum theoretical speed — real-world speeds are typically 60–80% of advertised.
Should I use binary or decimal units?
Use decimal (KB, MB, GB) for storage device capacities and manufacturer specs. Use binary (KiB, MiB, GiB) when working with RAM, system memory, or precise file size calculations. Most casual usage defaults to decimal since that's what storage brands advertise.
What is a petabyte in practical terms?
1 PB = 1,000 TB = 1,000,000 GB. In practical terms, 1 PB can store about 13.3 years of HD video, or 250 million photos, or the entire printed contents of the Library of Congress about 50 times over. Most individuals will never need petabyte-scale storage, but large data centers operate at this level.
How do cloud providers count storage?
Cloud providers typically use decimal units (GB and TB) for pricing and allocation, but some services may use binary internally. AWS S3, Google Cloud Storage, and Azure Blob Storage all use decimal. Always verify which unit system your provider uses when comparing costs.
Why are SSD capacities smaller than advertised?
Same reason as HDDs: manufacturers use decimal units while operating systems use binary. Additionally, SSDs reserve some capacity for over-provisioning (performance optimization) and wear leveling, which typically reduces usable space by 7–10%. A 512 GB SSD may show about 476 GiB in your OS.
Why are there different definitions of KB, MB, GB?
There are two standards: SI (decimal) uses powers of 10 (1 KB = 1,000 bytes) and is used by hard drive manufacturers. IEC (binary) uses powers of 2 (1 KiB = 1,024 bytes) and is used by operating systems for RAM. Our tool supports both standards.

Discover More Tools

Fresh picks from across our tool library.

Probability Calculator

BRRRR Calculator

Power Calculator

Grade Calculator

Shoe Size Converter

Stock DCA Calculator