Unit & Currency Converters

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Data Storage & Bandwidth Converter

Convert Decimal SI ($10^3$) vs Binary IEC ($2^{10}$) and calculate usable hard drive capacity.

Data Storage & Bandwidth Converter

Precise conversion between Decimal SI ($10^3$) and Binary IEC ($2^10$) standards with true drive capacity analysis.

Common Storage Sizes:

Storage Size

Standard Classification

Unit Standard: SI (Decimal)

Exact Raw Bytes: 1,000,000,000,000 Bytes

The "Missing Gigabytes" Mystery Solved

True Usable Drive Capacity in Windows

Drive manufacturers use decimal SI units (1,000 bytes = 1 KB), while Windows operating systems report file sizes using binary IEC units (1,024 bytes = 1 KiB), labeling them as "GB".

Box Advertised

1000 GB

Manufacturer Decimal

Windows OS Actual

931.32 GiB

True Usable Binary

Apparent Difference

-6.87%

Binary Scale Loss

Your hardware is not defective; this is standard industry binary versus decimal notation.

Transfer & Download Time Estimator

Estimated transfer duration for 1 TB across different broadband network speeds:

Mobile 4G LTE (25 Mbps)

88h 53m

Speed: 25 Mbps

Standard Broadband (100 Mbps)

22h 13m

Speed: 100 Mbps

Fast Fiber (500 Mbps)

4h 27m

Speed: 500 Mbps

Gigabit Fiber (1000 Mbps)

2h 13m

Speed: 1000 Mbps

Simultaneous SI & IEC Data Matrix

Compare decimal standards ($10^3$) side-by-side with binary standards ($2^10$).

Bitb

8.0000e+12

SI (Decimal)

ByteB

1.0000e+12

SI (Decimal)

Kilobyte (SI)KB

1.0000e+9

SI (Decimal)

Megabyte (SI)MB

1,000,000

SI (Decimal)

Gigabyte (SI)GB

1,000

SI (Decimal)

Terabyte (SI)TB

SI (Decimal)

Petabyte (SI)PB

0.001

SI (Decimal)

Kibibyte (IEC)KiB

976,562,500

IEC (Binary)

Mebibyte (IEC)MiB

953,674.316406

IEC (Binary)

Gibibyte (IEC)GiB

931.322575

IEC (Binary)

Tebibyte (IEC)TiB

0.909495

IEC (Binary)

Pebibyte (IEC)PiB

0.000888

IEC (Binary)

About Data Storage & Bandwidth Converter

Convert data units between Bytes, KB, MB, GB, TB (SI decimal) and KiB, MiB, GiB, TiB (IEC binary). Includes true usable hard drive capacity analysis and network download time estimates.

Key Capabilities & Features

Side-by-side Decimal SI ($10^3$) vs Binary IEC ($2^{10}$) conversion
Explains why 1 TB drives show as 931 GB in Windows OS
Network download time estimator across 25 Mbps to 1 Gbps connections
Simultaneous comparison table across all 12 storage units

How to Use Data Storage & Bandwidth Converter

Enter Data Size

Type the file or disk size amount.

Select Unit

Select from decimal (GB, TB) or binary (GiB, TiB) units.

Inspect Capacity & Speed

View Windows actual usable capacity and download estimates.

Privacy & In-Browser Execution Guarantee

Calculations execute entirely on your device with 100% privacy.

Frequently Asked Questions

Why does my 1 TB drive only show 931 GB in Windows?

Manufacturers sell drives in decimal SI (1 TB = 1,000,000,000,000 bytes). Windows calculates capacity using binary IEC GiB (1,073,741,824 bytes), which equals 931.32 GiB, although Windows labels it as 'GB'.

What is the difference between MB and MiB?

1 Megabyte (MB) = 1,000,000 bytes (10^6). 1 Mebibyte (MiB) = 1,048,576 bytes (2^20). MiB is approx. 4.86% larger than MB.

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