Data Storage Unit Converter

Convert between bits, Bytes, KB, MB, GB, and TB.

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Assumptions

  • This converter uses decimal SI storage units, so KB = 1000 B and MB = 1000 KB.
  • The calculator does not handle binary IEC units such as KiB, MiB, or GiB.
  • Input values should be finite numbers.

Sensitivity preview

Data Amount -10%: Converted Value 900

Data Amount Current: Converted Value 1,000

Data Amount +10%: Converted Value 1,100

Formula: Normalizes to bits then divides by target unit factor (Base 1000 for SI units).

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About this Data Unit Converter

In the digital world, data is measured in bits and bytes. However, prefixes like 'Kilo' and 'Mega' can be confusing because they sometimes mean 1000 (Decimal) and sometimes 1024 (Binary). This calculator performs conversions using the standard decimal system (1 kB = 1000 bytes) common in networking and storage marketing.

Who this calculator is for

  • IT teams, developers, and students converting between storage and transfer units.
  • Anyone comparing drive capacity, cloud storage, or network throughput figures.
  • Users translating ISP speeds in bits into file sizes in bytes.

When to use it

  • Use it to convert between file-size units like MB, GB, and TB.
  • Use it when turning a bandwidth number in bits into an equivalent byte figure.
  • Use it before estimating downloads, backups, or cloud storage usage.

How to use this calculator

  1. Enter the Value.
  2. Select the From unit (e.g., Gigabytes).
  3. Select the To unit (e.g., Megabytes).
  4. The calculator instantly shows the equivalent value.

Key assumptions

  • This converter uses decimal SI storage units, so KB = 1000 B and MB = 1000 KB.
  • The calculator does not handle binary IEC units such as KiB, MiB, or GiB.
  • Input values should be finite numbers.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

The tool converts the input to a base unit (bits) and then divides by the target unit's factor. * 8 bits = 1 Byte * 1000 Bytes = 1 Kilobyte (KB) * 1000 KB = 1 Megabyte (MB)
Normalizes to bits then divides by target unit factor (Base 1000 for SI units).

Inputs explained

Bit (b)

The smallest unit of data (0 or 1). Internet speeds are usually in bits (Mbps).

Byte (B)

8 bits. File sizes are usually in Bytes (MB, GB).

Understanding your results

Useful for converting between internet speed (bits) and file download size (Bytes). For example, 1 Gigabit = 125 Megabytes.

Example scenarios

Hard Drive

1 Terabyte (TB) = 1,000 Gigabytes (GB) = 1,000,000 Megabytes (MB).

Network

1 Gigabit (Gb) = 125 Megabytes (MB).

Key Features

  • Bit/Byte differentiation
  • Supports up to Terabytes
  • Instant precision

Tips & Best Practices

  • Storage manufacturers use decimal (1000) math. Operating systems (Windows) often use binary (1024) math, displaying 1 TB as roughly 931 GiB.
  • Uppercase 'B' usually means Bytes. Lowercase 'b' means bits.

Glossary of Terms

Decimal Prefix
SI standard where Kilo = 10^3 (1000).
Binary Prefix
IEC standard where Kibi = 2^10 (1024).

Frequently Asked Questions

Why do hard drives show less space in Windows?
Manufacturers market drives using decimal bytes (1 KB = 1000 B). Windows calculates space using binary bytes (1 KiB = 1024 B). A '1 TB' drive has 1,000,000,000,000 bytes, which Windows displays as approx 931 GB (actually GiB).
How many megabytes in a gigabyte?
In the decimal system (standard storage marketing), there are 1,000 MB in 1 GB. In the binary system (RAM/OS), there are 1,024 MiB in 1 GiB.
Is internet speed measured in bits or bytes?
Internet speed is almost always measured in bits (Mbps - Megabits per second). File sizes are measured in Bytes (MB - Megabytes).