Terabytes (TB) to Petabytes (PB) Converter
Enter your Terabytes (TB) value to convert to Petabytes (PB). 1 TB = 0.001 PB, calculated across both decimal (SI) and binary (IEC) standards.
Convert Terabytes to Petabytes
Do you want to convert petabytes to terabytes?
How to Convert Terabytes to Petabytes
To convert terabytes to petabytes, divide by 1,000 (using SI decimal). Both units measure storage capacity—the difference is scale. Learn more: calculate PB to TB.
TB: A terabyte is 1,000 gigabytes or 1,000,000,000,000 bytes. Common size for modern hard drives and SSDs. See also: TB to Zb conversion rate.
PB: A petabyte is 1,000 terabytes or 1,000,000,000,000,000 bytes. Used for large-scale enterprise and cloud storage. See also: converting Kibibytes to Petabytes.
1 TB = 0.001 PB (using SI decimal standard) — or equivalently, 1 PB = 1,000TB.
TB to PB Conversion Formula
// Convert TB to PB
PB = TB × 0.001
// Reverse: Convert PB to TB
TB = PB × 1,000
TB to PB Conversion Examples
100 TB = 0.1 PB
256 TB = 0.256 PB
500 TB = 0.5 PB
1,000 TB = 1 PB
2,048 TB = 2.048 PB
Binary Standard (Base 1024)
Using binary calculation: 1 TB = 0.0009765625 PB
100 TB = 0.09765625 PB
1,000 TB = 0.9765625 PB
1,024 TB = 1 PB
What Is a Terabyte?
A terabyte is 1,000 gigabytes or 1,000,000,000,000 bytes. Common size for modern hard drives and SSDs. See also: Yobibytes in Gibibits.
The terabyte is a SI decimal unit of digital information storage. It uses base 1,000 following the SI (International System of Units) standard. Use our bps to MB/s.
Common uses: External hard drives, NAS storage, video libraries, enterprise backups Try the TB to Pib converter.
1 TB = 8 × 10¹² bits = 1 × 10¹² bytes.
The terabyte can be abbreviated as TB; for example, 1 terabyte can be written as 1 TB.
What Is a Petabyte?
A petabyte is 1,000 terabytes or 1,000,000,000,000,000 bytes. Used for large-scale enterprise and cloud storage. You might also need: Eib to PB calculator.
The petabyte is a SI decimal unit of digital information storage. It uses base 1,000 following the SI (International System of Units) standard. Related: convert Eib to GB.
Common uses: Data centers, cloud storage providers, scientific research, enterprise archives You might also need: ZiB/s → Yibps.
1 PB = 8 × 10¹⁵ bits = 1 × 10¹⁵ bytes.
The petabyte can be abbreviated as PB; for example, 1 petabyte can be written as 1 PB.
Terabyte to Petabyte Conversion Table
The table below shows various terabyte measurements converted to petabytes.
| Terabytes | Petabytes | Petabytes (Binary) |
|---|---|---|
| 1 TB | 0.001 PB | 0.0009765625 PB |
| 2 TB | 0.002 PB | 0.001953125 PB |
| 5 TB | 0.005 PB | 0.0048828125 PB |
| 10 TB | 0.01 PB | 0.009765625 PB |
| 25 TB | 0.025 PB | 0.0244140625 PB |
| 50 TB | 0.05 PB | 0.048828125 PB |
| 100 TB | 0.1 PB | 0.09765625 PB |
| 128 TB | 0.128 PB | 0.125 PB |
| 250 TB | 0.25 PB | 0.244140625 PB |
| 256 TB | 0.256 PB | 0.25 PB |
| 500 TB | 0.5 PB | 0.48828125 PB |
| 512 TB | 0.512 PB | 0.5 PB |
| 1,000 TB | 1 PB | 0.9765625 PB |
| 1,024 TB | 1.024 PB | 1 PB |
SI Decimal vs Binary: Why Two Different Standards?
When converting terabytes to petabytes, different tools may give slightly different results. This is because there are two competing standards for measuring digital storage:
| Standard | Base | 1 KB equals | Used By |
|---|---|---|---|
| SI Decimal | 1000 | 1,000 bytes | Hard drive manufacturers, macOS, network speeds |
| Binary (IEC) | 1024 | 1,024 bytes | Windows, Linux (partially), RAM specifications |
Why Does My Hard Drive Show Less Space Than Advertised?
This difference in standards explains the common "missing hard drive space" confusion.
Example: A "500 GB" Hard Drive
- Contains exactly: 500,000,000,000 bytes
- macOS (SI Decimal): Displays 500 GB (divides by 1,000³)
- Windows (Binary): Displays 465 GB (divides by 1,024³)
The Verdict: Same bytes, same drive—just different math. No space is actually missing.
Note: Our calculator defaults to SI decimal (base 1000) to match the box label. To match Windows, toggle the standard at the top of the calculator.
💡 Storage Engineer Tip
Manufacturers label drives using SI decimal (base 1000). Windows divides by 1024 instead—that's why a "1 TB" drive shows as 931 GB. Same bytes, different math.
— Subash Geetha Krishnan, 15+ years in enterprise storage
When to Convert TB to PB
Common scenario: Planning storage allocation, comparing specifications, or converting between terabyte and petabyte for capacity planning. See also: Terabytes to Zettabytes.
Other situations include storage planning for calculating how much data fits in a given capacity, file management for understanding sizes across different scales, cost estimation for budgeting cloud storage, and backup planning for determining media requirements. You might also need: Mebibytes to PB calculator.