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Data Storage Converter

Data & Digital

Instantly convert digital storage units — bits, bytes, KB, MB, GB, and TB. Ideal for comparing file sizes, cloud plans, and device storage capacity.

Reviewed by the thecalcu.com team · Last updated July 1, 2026

From
To
All conversionsfor 1 Gigabyte (GB)
Bit (b)8000000000
Byte (B)1000000000
Kilobyte (KB)1000000
Megabyte (MB)1000
Gigabyte (GB)1
Terabyte (TB)0.001
Petabyte (PB)0.000001
Kibibyte (KiB)976562.5
Mebibyte (MiB)953.67432
Gibibyte (GiB)0.93132257
Tebibyte (TiB)0.0009094947

What is a Data Storage?

A data storage converter instantly converts between any two units of digital storage capacity, from individual bits up to petabytes, spanning both the SI decimal system and the binary IEC system. Storage capacity describes how much data a device can hold or a file takes up, and it shows up across nearly every digital context: the storage tier on your phone, the drive in your laptop, an attachment size limit, a cloud storage plan.

Two parallel measurement systems are what make storage conversions genuinely non-trivial. The SI decimal system, used by drive manufacturers, cloud providers, and telecom operators, defines units in powers of 10: 1 KB = 1,000 bytes, 1 MB = 1,000 KB, 1 GB = 1,000 MB. The binary IEC system, used by operating systems and RAM specifications, defines units in powers of 2: 1 KiB = 1,024 bytes, 1 MiB = 1,024 KiB, 1 GiB = 1,024 MiB. These two systems diverge more the higher up you go, a terabyte (1,000 GB) is about 9.1% smaller than a tebibyte (1,024 GiB).

This gap shows up in concrete, everyday ways. A cloud provider advertising 100 GB of storage means exactly 100,000,000,000 bytes. When your operating system shows a 1 TB hard drive as 931 GB, it's actually reporting in binary GiB while labeling it "GB", a naming convention left over from before the IEC standardized the binary prefixes. When you buy a 256 GB flash drive and your file manager shows 238 GB, that gap is the decimal-to-binary conversion, not missing storage.

This converter covers bits, bytes, KB, MB, GB, TB, and PB on the decimal side, and KiB, MiB, GiB, and TiB on the binary side, every unit you're likely to run into while shopping for storage, choosing a cloud plan, or managing file transfers. Pair it with the Data Transfer Converter when you need to translate between file size and transfer or download time.

Who Should Use This Converter?

General users and students comparing phone and laptop storage options benefit from understanding why a device's actual available space in settings is lower than the advertised number. Pair with the Data Transfer Converter when estimating how long a backup or download will take.

IT professionals and system administrators working across Windows, Linux, and cloud environments run into the decimal/binary mismatch constantly. Quickly cross-referencing GiB to GB avoids misconfiguration when provisioning storage volumes or reading a monitoring dashboard.

Developers and DevOps engineers calculating storage quotas, buffer sizes, and log retention policies need precise conversions between bits, bytes, and larger SI units, a retention policy written in bytes but displayed in MB is exactly this kind of conversion.

Content creators and video editors dealing with large raw footage files use this converter to plan drive purchases and backup workflows, an hour of high-bitrate 4K footage can easily run 80–100 GB.

Anyone shopping for a cloud plan or internet data package quoted in GB and MB uses this tool to understand exactly how much storage or data they're actually getting.

How to use this Data Storage calculator

  1. Select the FROM unit in the left panel dropdown, choose "Gigabyte (GB)" if your starting value is in GB.
  2. Select the TO unit in the right panel dropdown, choose "Megabyte (MB)" to see the equivalent in megabytes.
  3. Enter your value in the input field on the left, the result updates instantly in the right panel, no button needed.
  4. Use the ⇅ swap button between the two panels to reverse the conversion direction without re-selecting units.
  5. Check the reference table below the panels to see your value expressed across all available units at once.
  6. Interpret the result, if you're comparing a cloud plan quoted in decimal GB against what your OS reports in binary GiB, the reference table row shows both side by side.

What Insights Does the Data Storage Converter Give You?

The primary output is the converted value shown in the result panel, entering 1.5 GB immediately shows 1,500 MB (decimal) or 1,536 MiB (binary), depending on your chosen target unit. Precision matters here: OS-level size reporting is exact to the byte, so the converter keeps full precision rather than rounding aggressively.

The reference table is the most useful part of the tool day to day. It shows your input value across all 11 units simultaneously, bits, bytes, KB, MB, GB, TB, PB, KiB, MiB, GiB, TiB, in a single view. That's particularly handy when comparing storage across systems: at a glance you can see that a 512 GB SSD equals 0.512 TB and roughly 476.8 GiB.

Practical thresholds worth knowing:

  • Under 1 MB, email attachments, text documents, small images
  • 1–100 MB, photos, short video clips, app downloads
  • 1–50 GB, HD movies, large app installs, game downloads, OS backups
  • 100 GB–2 TB, the range most laptop and desktop SSDs fall into today
  • 5 TB+, NAS drives, server storage, enterprise backups

Common Mistakes to Avoid

Comparing decimal and binary units without converting first. A "1 TB" drive and a "931 GiB" reading in your file manager describe the same physical storage, treating them as different amounts leads to confusion that isn't actually a storage shortfall.

Confusing bits and bytes. Internet speeds are quoted in Mbps (megabits per second, lowercase b), while file sizes are quoted in MB (megabytes, capital B), an 8x difference that trips up a lot of people estimating download times.

Assuming all operating systems label units the same way. Some platforms have moved to properly labeling binary units as KiB/MiB/GiB, while others still display binary values under decimal-looking labels like "GB", check which convention a given tool or OS is actually using before comparing numbers across systems.

Rounding too early in a multi-step conversion. When converting through several unit steps, rounding partway through introduces small errors that compound, this converter keeps full precision throughout, so trust the final figure over a manual multi-step calculation.

Formula & Methodology

Base unit: Byte (B)

All conversions route through the byte as a common base:

> Result = Input × (F_from ÷ F_to)

Where F_from is the source unit's byte-equivalent factor and F_to is the target unit's byte-equivalent factor.

Key conversion factors:

| Unit | Factor (bytes) | System |
|---|---|---|
| Bit (b) | 0.125 | SI Decimal |
| Byte (B) | 1 | SI Decimal |
| Kilobyte (KB) | 1,000 | SI Decimal |
| Megabyte (MB) | 1,000,000 | SI Decimal |
| Gigabyte (GB) | 1,000,000,000 | SI Decimal |
| Terabyte (TB) | 1,000,000,000,000 | SI Decimal |
| Petabyte (PB) | 1,000,000,000,000,000 | SI Decimal |
| Kibibyte (KiB) | 1,024 | Binary IEC |
| Mebibyte (MiB) | 1,048,576 | Binary IEC |
| Gibibyte (GiB) | 1,073,741,824 | Binary IEC |
| Tebibyte (TiB) | 1,099,511,627,776 | Binary IEC |

Worked example:

A cloud storage plan offers 100 GB. How many MiB is that?

- F_from (GB) = 1,000,000,000 bytes
- F_to (MiB) = 1,048,576 bytes
- Result = 100 × (1,000,000,000 ÷ 1,048,576) = 95,367.4 MiB

This is exactly why 100 GB of cloud storage shows as approximately 93.1 GiB in a Linux or Windows file manager, the OS divides by 1,073,741,824 instead of 1,000,000,000.

Common reference values:

| Value | Decimal equivalent | Binary equivalent |
|---|---|---|
| 1 KB | 1,000 bytes | N/A |
| 1 KiB | N/A | 1,024 bytes |
| 1 MB | 1,000 KB | N/A |
| 1 GB | 1,000 MB | ≈ 953.67 MiB |
| 1 TB | 1,000 GB | ≈ 931.32 GiB |
| 128 GB | 128,000 MB | ≈ 119.2 GiB |
| 512 GB | 512,000 MB | ≈ 476.8 GiB |
| 1 PB | 1,000 TB | ≈ 888.18 TiB |

You may also find the Data Transfer Converter and Unicode Text Converter useful for adjacent conversion tasks, along with the Bitrate Converter if you're working with streaming or encoding rates rather than static file sizes.

Frequently Asked Questions

It's a tool for converting between the units used to measure digital storage capacity, from bits and bytes up to petabytes, covering both the SI decimal system (KB, MB, GB) and the binary IEC system (KiB, MiB, GiB). Storage capacity shows up everywhere: the storage tier on your phone, the drive in your laptop, an email attachment limit, a cloud storage plan. Two parallel unit systems exist side by side, which is exactly why conversions get confusing without a reliable tool.
A kilobyte in the SI decimal system equals exactly 1,000 bytes, while a kibibyte in the binary IEC system equals 1,024 bytes. That 2.4% gap compounds at higher units, a gigabyte is 1,000,000,000 bytes, while a gibibyte is 1,073,741,824 bytes, nearly 7.4% more. This is why a 1 TB hard drive shows up as roughly 931 GiB in a typical operating system's file explorer.
SI decimal units, bit, byte, KB, MB, GB, TB, PB, use powers of 10, multiplying by 1,000 at each step. Binary IEC units, KiB, MiB, GiB, TiB, use powers of 2, multiplying by 1,024 at each step. Drive and SSD manufacturers advertise capacity in decimal units because the numbers come out larger, while operating systems have historically reported file and disk sizes in binary units. The IEC formally standardized the binary prefixes in 1998 specifically to remove this ambiguity.
Result = Input × (F_from ÷ F_to), where F_from and F_to are each unit's conversion factor relative to the base unit (the byte). Converting 5 GB to MB: Result = 5 × (1,000,000,000 ÷ 1,000,000) = 5,000 MB. The same formula works for binary units with binary factors, 5 GiB = 5 × (1,073,741,824 ÷ 1,048,576) = 5,120 MiB.
Multiply by 1,000 in the SI decimal system, since 1 GB = 1,000 MB, so 4 GB = 4,000 MB. In the binary system, 1 GiB = 1,024 MiB, so 4 GiB = 4,096 MiB. On this converter, set GB as the FROM unit, MB as the TO unit, and enter your value to get the result instantly.
Divide by 1,000 in the SI decimal system, 2,500 MB comes out to 2.5 GB. In binary, divide by 1,024 instead: 2,048 MiB equals 2 GiB. Set MB as the FROM unit and GB as the TO unit, enter 2500, and the result appears immediately alongside a reference table showing every other unit equivalent.
Select the unit you're converting from in the left panel, then select your target unit in the right panel. Type your value and the result updates instantly, no button to press. Use the ⇅ swap button to reverse direction without re-entering anything. The reference table below shows the same value across all available units simultaneously, so you can compare bits, bytes, KB, MB, GB, TB, KiB, MiB, GiB, and TiB in one view.
Manufacturers measure capacity in SI decimal units (1 GB = 1,000,000,000 bytes), but operating systems typically display storage in binary-based gibibytes while still labeling them 'GB', a legacy naming inconsistency. A 1 TB drive (1,000,000,000,000 bytes) therefore shows as roughly 931 GiB in a Windows or Linux file manager. This isn't a defect; the actual byte count matches what was advertised, only the display unit differs.
In the SI decimal system, 1 gigabyte equals exactly 1,000 megabytes. In the binary IEC system, 1 gibibyte equals exactly 1,024 mebibytes. Most everyday contexts, phone storage, cloud plans, download sizes, use the decimal definition, so 1 GB = 1,000 MB is the practically correct answer for most consumer purposes. The binary definition mainly shows up in RAM specs and OS-level file size reporting.
512 GB equals exactly 0.512 TB in the decimal system, since 1 TB = 1,000 GB. In the binary system, 512 GiB equals 0.5 TiB, since 1 TiB = 1,024 GiB. This comes up a lot for SSD shoppers, a 512 GB SSD is, in decimal terms, exactly half a terabyte.
Yes, and it's a common source of confusion, a capital B means bytes, while a lowercase b means bits, and there are 8 bits in a byte. Internet speeds are usually advertised in Mbps (megabits per second), while file sizes and storage are measured in MB (megabytes). A '100 Mbps' connection downloads at roughly 12.5 MB per second, not 100 MB per second, this converter's bit and byte units let you check that conversion directly.
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