Bytes to GB Converter

Computer Science & Digital Storage Metrology (IEC 80000-13)

Digital storage uses two distinct base numbering systems:

• **

• Binary IEC Standard**:

1 KiB = 2^10 = 1,024 B, 1 MiB = 2^20 = 1,048,576 B, 1 GiB = 2^30 = 1,073,741,824 B

GiB = Bytes1,073,741,824

• **

• Decimal SI Standard**:

1 KB = 10^3 = 1,000 B, 1 MB = 10^6 = 1,000,000 B, 1 GB = 10^9 = 1,000,000,000 B

GB = Bytes1,000,000,000

• **

• The 7.37% Windows Storage Penalty**:

Discrepancy Ratio = (10^9) / (2^30) = (1,000,000,000) / (1,073,741,824) ≈ 0.93132257 7.37\% difference

How to Use This Calculator

Enter your Number of Bytes (B) (e.g. 1073741824), Digital Storage Standard — choose from Binary IEC / OS Display (1 GiB = 2³⁰ = 1,073,741,824 Bytes - Windows), Decimal SI / Drive Manufacturers (1 GB = 10⁹ = 1,000,000,000 Bytes - macOS/Linux), and Digital Storage Capacity Benchmark — choose from Custom Byte Quantity, 1,073,741,824 Bytes (Exact 1.0 GiB Binary / 1.0737 GB SI), 1,000,000,000 Bytes (Exact 1.0 GB SI / 0.9313 GiB in Windows). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

SI Decimal: 10^9 = 1,000,000,000 Bytes

IEC Binary: 2^30 = 1,073,741,824 Bytes

Worked Example

A 64 GB USB flash drive containing 64,000,000,000 bytes shows up in Windows as 64,000,000,000 ÷ 1,073,741,824 = 59.6046 GiB of usable space.

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.