Binary vs Decimal Unit Converter

Understand why your 1 TB drive shows as 931 GiB in Windows. Compare SI decimal (1000) vs IEC binary (1024) units.

Binary vs Decimal Unit Converter Live Calculation
Actual Windows Capacity Displayed:
931.32 GiB (shown as "GB")
In Tebibytes (TiB):0.909 TiB
Apparent Difference:68.68 GB (6.87%)
Actual Physical Bytes:1,000,000,000,000 Bytes (100% present)
Measurement Note: The 6.87% difference is an apparent numerical difference resulting from Windows measuring storage in binary blocks (1 GiB = 1,073,741,824 bytes) while labeling them with metric "GB". Exactly zero physical bytes are missing from the drive; all advertised bytes exist on the hardware.

What is the Binary vs Decimal Unit Converter?

The definitive tool to resolve consumer confusion between storage drive labeling and operating system capacity reports.

How to Use This Tool

Enter any capacity in decimal or binary units to compare exact values side by side and calculate the exact missing capacity explanation.

Formula & Calculation Logic

The mathematical formula used to calculate this conversion is:

GiB = (GB × 1,000,000,000) ÷ 1,073,741,824 Apparent Difference % = [1 - (1,000^3 ÷ 1,024^3)] × 100 ≈ 6.87%

Step-by-Step Example Calculation

Here is a real-world calculation example demonstrating the mathematics:

Example: 1 TB drive Decimal: 1,000,000,000,000 Bytes In Binary Gibibytes (Windows): 1,000,000,000,000 ÷ 1,073,741,824 = 931.32 GiB Apparent Numerical Difference: ~68.68 (6.87% of 1,000 GB base) Note: Exactly zero physical bytes are missing; all 1,000,000,000,000 bytes exist on the drive.