Gigabytes to Terabytes
Convert gigabytes to terabytes for HDD sizing, cloud storage, and backup planning. 1 TB = 1,000 GB — enter any GB value for instant terabyte conversion.
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Tips & Notes
- ✓Consumer HDD and SSD sizes in 2025: 1 TB, 2 TB, 4 TB, 8 TB, 16 TB, 20 TB HDDs. NVMe SSDs: 500 GB, 1 TB, 2 TB, 4 TB. All labeled in decimal TB = 1,000 GB. Windows shows the same drive as 0.931 TiB because it uses binary.
- ✓The TB gap: a "1 TB" drive (1,000,000,000,000 bytes) shows as 931 GB in Windows (binary reporting). This is 931 GiB = 0.909 TiB. The lost 69 GB in Windows terms is not actually missing — it is 69 decimal GB × 1,000,000,000 bytes = 69,000,000,000 bytes all present on the drive.
- ✓Cloud storage tiers: Google One 2 TB = 2,000 GB; iCloud+ 2 TB = 2,000 GB; Microsoft OneDrive (Microsoft 365) 1 TB = 1,000 GB; Dropbox Pro 2 TB = 2,000 GB. Enterprise S3 storage: Amazon S3 Standard charges per GB; at scale 1,000,000 GB = 1,000 TB = 1 PB per month.
- ✓NAS (Network Attached Storage) for home/small business: a 4-bay NAS with 4× 4 TB drives in RAID 5 gives approximately 3 × 4 TB = 12 TB usable (12,000 GB). In RAID 6: 2 × 4 TB = 8 TB usable (8,000 GB). Backup rule of 3-2-1: 3 copies, 2 media types, 1 offsite.
- ✓Video production storage: 4K ProRes 422 footage runs ≈ 200-350 GB/hour. A 10-hour shoot = 2,000-3,500 GB = 2-3.5 TB of raw footage. Plus project files, exports, and backups: plan for 3-5× the raw footage size in total project storage.
Common Mistakes
- ✗Expecting "1 TB" drive to show as 1,000 GB in Windows — Windows reports storage in binary GiB labeled as "GB". A 1 TB (1,000,000,000,000 bytes) drive shows as approximately 931 GB in Windows (931 GiB). macOS shows 1.00 TB (decimal). Linux df -H shows 1.0 T.
- ✗Calculating backup storage requirements without accounting for redundancy — 5 TB of data in RAID 1 requires 10 TB of raw storage (mirror). In RAID 5 with 4 drives: 3/4 of total raw capacity is usable = 4 × 4 TB × 0.75 = 12 TB usable from 16 TB raw.
- ✗Treating cloud storage capacity as actual backup capacity — cloud providers replicate data internally (AWS S3 stores 11 nines durability), but this is not the same as the user having multiple backup copies. User error, ransomware, or accidental deletion can still result in data loss. Always maintain independent backups.
- ✗Confusing data cap with storage capacity — a 1 TB/month data cap from an ISP is a transfer limit, not storage. A 1 TB hard drive is a storage device. Different TB; entirely different context.
- ✗Not accounting for filesystem overhead in storage planning — ext4, NTFS, and APFS filesystems use 1-5% of drive capacity for metadata, journal, and reserve space. A 2 TB drive formatted with ext4 typically has 1,960-1,980 GB available for user data.
Gigabytes to Terabytes Overview
The terabyte is the frontier of everyday consumer storage — where home photo libraries, 4K video archives, and NAS backup systems operate. Converting gigabytes to terabytes reveals how close (or far) a storage project is from the TB milestone.
GB to TB formula:
TB = GB / 1,000 (decimal) | TiB = GiB / 1,024 (binary) | The "missing GB" gap = 7.4% at 1 TB
EX: Photo library 850 GB → 0.85 TB (decimal). 4K video shoot 2,400 GB → 2.4 TB. NAS with 4 × 4 TB drives RAID 5 → usable = 3 × 4 TB = 12 TB = 12,000 GBInverse — TB to GB:
GB = TB × 1,000 | A 1 TB SSD = 1,000 GB. Windows shows 931 GB (binary GiB discrepancy)
EX: 2 TB cloud storage = 2,000 GB. At 4 MB/photo: 500,000 photos. At 200 GB/hour 4K footage: 10 hours of raw video.HDD and SSD capacity in GB and TB:
| Drive Type | Capacity (TB) | Capacity (GB) | 4 MB Photos |
|---|---|---|---|
| Laptop SSD (standard) | 1 TB | 1,000 GB | 250,000 |
| Desktop SSD (high-end) | 4 TB | 4,000 GB | 1,000,000 |
| External HDD (portable) | 5 TB | 5,000 GB | 1,250,000 |
| Desktop HDD | 8 TB | 8,000 GB | 2,000,000 |
| NAS HDD | 16 TB | 16,000 GB | 4,000,000 |
| Enterprise HDD | 24 TB | 24,000 GB | 6,000,000 |
| Service | Tier | GB | Cost/month | Photos (4 MB) |
|---|---|---|---|---|
| Google One | 100 GB | 100 GB | $1.99 | 25,000 |
| Google One | 2 TB | 2,000 GB | $9.99 | 500,000 |
| iCloud+ | 50 GB | 50 GB | $0.99 | 12,500 |
| iCloud+ | 2 TB | 2,000 GB | $9.99 | 500,000 |
| Microsoft 365 | 1 TB | 1,000 GB | $6.99 | 250,000 |
Frequently Asked Questions
Divide GB by 1,000 for decimal TB or GiB by 1,024 for binary TiB. Examples: 500 GB = 0.5 TB (decimal) = 0.488 TiB (binary). 1,000 GB = 1.0 TB = 0.977 TiB. 2,000 GB = 2.0 TB = 1.953 TiB. 4,096 GiB = 4.0 TiB (binary) = 4.398 TB (decimal). Storage manufacturers use decimal: "1 TB" = 1,000 GB. Windows reports binary: that same "1 TB" = 931 GiB (displayed as "931 GB" in Windows).
Consumer storage in 2025: laptop SSD 256 GB, 512 GB, 1 TB, 2 TB. Desktop SSD: 1 TB, 2 TB, 4 TB. External HDD: 1 TB, 2 TB, 4 TB, 5 TB, 8 TB. NAS HDD: 4 TB, 6 TB, 8 TB, 12 TB, 16 TB, 20 TB. Enterprise HDD: 16 TB, 18 TB, 20 TB, 24 TB. The largest consumer HDDs (20 TB) contain 20,000 GB of storage. At 4 MB per photo, a 20 TB drive holds 5,000,000 photos. At 200 GB per hour of 4K ProRes footage, it holds 100 hours of professional video.
The decimal vs. binary gap at TB scale: 1 decimal TB = 1,000,000,000,000 bytes. 1 binary TiB = 1,099,511,627,776 bytes. A "1 TB" drive has 1,000,000,000,000 bytes (all there). Windows reads it as 1,000,000,000,000 / 1,073,741,824 = 931.3 GiB and displays "931 GB." The 68.7 GB apparent "missing" is due to the 7.4% difference between TB (×10¹²) and TiB (×2⁴⁰). macOS switched to decimal reporting in 2009 — a "1 TB" drive shows as 1 TB in macOS finder. This is why comparing storage specs between Windows and macOS reports requires knowing which system uses which convention.
NAS sizing calculation: estimate total current data (photos, videos, documents, music): typical family 1-5 TB raw. Apply RAID redundancy: RAID 1 (mirror) = 2× raw capacity; RAID 5 (1 parity drive) = (n-1)/n capacity. Plan for 3 years growth: ×2-3. With room for backups: ×2. Example: 2 TB current data × 3 growth = 6 TB needed × 2 for RAID 5 inefficiency = 12 TB raw capacity minimum. Choose 4 × 4 TB drives (16 TB raw, 12 TB usable in RAID 5). Budget $150-250 per 4 TB NAS drive × 4 = $600-1,000 for drives plus NAS hardware.
1 petabyte (PB) = 1,000 TB = 1,000,000 GB. Petabyte-scale examples: Facebook stores approximately 1,000+ PB (1 exabyte) of photos and videos. Netflix content library ≈ 3.5 PB. The human genome (3 billion base pairs) = approximately 750 MB uncompressed; the entire genome of all humans alive = 750 MB × 8 billion = 6 × 10^18 bytes = 6 exabytes. Large Hadron Collider (CERN) generates ≈ 1 PB of collision data per second during experiments. Global internet traffic in 2024: approximately 5 exabytes per day = 5,000,000 TB/day = 5,000 PB/day.
Cost comparison for 1 TB of storage: AWS S3 Standard ≈ $23/month = $276/year. Google Cloud Storage Standard ≈ $20/month = $240/year. Azure Blob (LRS) ≈ $18/month = $216/year. Google One 2 TB plan ≈ $9.99/month = $120/year ($60/TB). 2 TB external HDD one-time cost ≈ $50-80 (amortized over 5 years: $10-16/year). For personal use: a $65 2 TB drive costs less in one year than any cloud storage subscription at scale. For business: cloud offers redundancy, accessibility, and no hardware management — justifying the higher cost per TB.