Gigabyte ↔ Byte Converter (Binary/Decimal)

1 Binary GB (GiB) = 1024³ B = 1073741824 B | 1 Decimal GB = 10⁹ B = 1000000000 B | 1 GB = 1024 MB (binary) / 1000 MB (decimal)

1 Binary GB (GiB) = 1073741824 B (2³⁰ bytes) | 1 Decimal GB = 1000000000 B (10⁹ bytes) | 1 GB = 1024 MB (binary) / 1000 MB (decimal)

Select GB standard (critical for storage accuracy):

Select conversion direction:

GB

Binary: 1 GB = 1024³ B (computing/storage) | Decimal: 1 GB = 10⁹ B (marketing/consumer)

B

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Quick storage conversions - click to auto-fill:

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About Gigabyte to Byte Conversion

Conversion Formula

✅ Binary (Computing) GB (GiB):

GB → B: B = GB × 1024³ = GB × 1073741824

B → GB: GB = B ÷ 1073741824 = B × 9.313225746154785e-10

✅ Decimal (Marketing) GB:

GB → B: B = GB × 10⁹ = GB × 1000000000

B → GB: GB = B ÷ 1000000000 = B × 1e-9

IT Usage Tips

  • OS/Software: Uses binary (1 GB = 1073741824 B) → 1TB drive = 931 GiB
  • Manufacturers: Uses decimal (1 GB = 10⁹ B) → 1TB drive = 1000 GB
  • Networking: Decimal (1 Gbps = 10⁹ bits/s = 125 MB/s)
  • Cloud Storage: Mixed (verify - AWS/Azure use decimal for billing)

Frequently Asked Questions

Why are there two definitions of Gigabyte (binary vs decimal)?

The dual definition stems from historical and marketing reasons:

  • Binary (1024-based): Traditional computing (2ⁿ system) — 1 KB = 1024 B, 1 MB = 1024 KB, 1 GB = 1024 MB (renamed GiB by SI)
  • Decimal (1000-based): Marketing/consumer electronics — Manufacturers use 1 GB = 1000 MB to make storage seem larger (1TB drive = 1000GB vs 931GiB)
  • SI Naming: Binary GB = GiB (Gibibyte), Decimal GB = GB (Gigabyte) (official distinction since 1998)
This mismatch is why a "500GB" hard drive shows as ~465GiB in Windows.

When to use binary vs decimal GB?

Practical guidelines for IT professionals:

✅ Use Binary (GiB): OS storage metrics, RAM capacity, file sizes, software development

✅ Use Decimal (GB): Storage device marketing, network speeds (Gbps), cloud billing, consumer specs

✅ Critical: Always clarify which standard is used (e.g., "500GiB (536GB decimal)")

✅ Example: 8GB RAM = 8589934592 B (binary) (exact, no marketing fluff)

Failing to distinguish causes confusion (e.g., "10GB file" vs "10GiB file" = 7% size difference).

Common storage conversion scenarios

Real-world IT applications for GB ↔ B conversion:

  1. Storage capacity: 2TB drive (decimal) = 2000000000000 B = 1862.645 GiB (binary)
  2. File transfer: 1GB file (binary) = 1073741824 B → 100 Mbps network = 12.5 MB/s → 85.9s transfer time
  3. RAM allocation: 16GB RAM = 17179869184 B → 4GB per core (4-core CPU)
  4. Cloud storage: 100GB (decimal) = 100000000000 B = 93.13 GiB (binary) (AWS S3 billing)
Always verify the standard with stakeholders (developers/ops/marketing).

How to verify conversion accuracy?

Cross-check with official standards:

Binary: 1 GiB = 2³⁰ B = 1073741824 B (IEC standard, 1998)

Decimal: 1 GB = 10⁹ B = 1000000000 B (SI standard)

Conversion: 1 GiB = 1.073741824 GB (decimal) | 1 GB (decimal) = 0.9313225746154785 GiB

Validation: Windows → Right-click drive → Properties (shows both GiB and GB)

For critical systems (e.g., data centers), use SI/IEC compliant tools for conversions.

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