Terabyte to Petabyte
Free instant terabyte to petabyte converter. 1 TB = 0.001 PB.
Common Terabyte to Petabyte values
| Terabyte (TB) | Petabyte (PB) |
|---|---|
| 1 | 0.001 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
How does Terabyte to Petabyte conversion work?
Type a value in the Terabyte (TB) field and the equivalent in Petabyte (PB) appears instantly to the right. The math uses the exact formula shown above — no rounding errors, no approximations beyond standard floating-point precision. Use the swap button to flip the units and see the inverse conversion.
Terabyte. 1 trillion bytes. Modern SSDs and hard drives are commonly sized in terabytes.
Petabyte. 1 quadrillion bytes. Used by data centres, cloud storage, and large-scale archives.
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Conversion factors come from the official standard (NIST, BIPM, ISO definitions where applicable). Values are precise to standard floating-point limits.
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How it works — the formula
Decimal (SI) prefixes: 1 kB = 10³ bytes, 1 MB = 10⁶, 1 GB = 10⁹, 1 TB = 10¹²
Binary (IEC) prefixes: 1 KiB = 2¹⁰ = 1,024 bytes, 1 MiB = 2²⁰, 1 GiB = 2³⁰
Difference grows with scale: 1 TB ≈ 0.909 TiBTwo prefix systems coexist for byte counts. SI prefixes (kilo, mega, giga, tera = 10ⁿ) are used by storage manufacturers, networking standards, and most operating systems other than Windows. IEC binary prefixes (kibi, mebi, gibi, tebi = 2ⁿ, codified in IEC 80000-13:2008) are used by RAM specifications, the Linux kernel's `du` command, and most academic papers. The two diverge by ~2.4% at the kilo scale and ~10% at the tera scale; a "1 TB" disk holds 1×10¹² bytes (~931 GiB as Windows reports it).
Worked examples
- Inputs:
- 1 TB drive (= 10¹² bytes)
- Output:
- ≈ 931.32 GiB — what Windows displays
- Inputs:
- 100 Mbps link, 8 bits/byte
- Output:
- 100 / 8 = 12.5 MB/s peak (or ~11.92 MiB/s)
- Inputs:
- "8 GB" stick of DDR5
- Output:
- Actually 8 GiB = 2³³ bytes ≈ 8.589 GB decimal — RAM uses binary
Limitations
- Operating-system reporting differs: Windows uses GB to mean GiB, macOS and Linux typically use GB for 10⁹ bytes — same number, different label.
- Network "Mbps" is megabits per second (10⁶ bits), not megabytes per second; divide by 8 to get MB/s.
- Disk filesystem overhead reduces usable bytes vs the raw drive capacity by 1–10% depending on format and reserved space.
- "Tape" and other archival formats use yet other capacity-reporting conventions.
Conversions are exact rational arithmetic; the SI/IEC ambiguity is the only meaningful source of confusion and is labeled explicitly in the worked examples.