How many bytes are in a terabyte?

One terabyte (TB) equals exactly 1,000,000,000,000 bytes (10^12) under the SI decimal standard used by storage manufacturers and the SI system. Under the IEC binary standard, 1 tebibyte (TiB) equals 1,099,511,627,776 bytes (2^40).

Why does my 2 TB drive show less than 2 TB in Windows?

Drive makers measure in decimal TB (10^12 bytes), but Windows reports in binary units while still labeling them "GB" or "TB". A 2 TB drive has 2,000,000,000,000 bytes, which equals about 1.818 TiB in binary — so Windows shows roughly 1.82 TB.

What is the difference between TB and TiB?

1 TB (terabyte) = 10^12 bytes = 1,000,000,000,000 bytes. 1 TiB (tebibyte) = 2^40 bytes = 1,099,511,627,776 bytes. TiB is about 9.95% larger than TB.

When should I use TB vs TiB?

Use TB when working with storage specifications, drive capacities, or cloud storage quotas — vendors use decimal TB. Use TiB when interpreting OS file sizes, RAM, or software that reports in binary units (Linux df, Windows Explorer).

How accurate is this converter for very large numbers?

JavaScript uses 64-bit floating-point, accurate to about 15-16 significant digits. For exabyte-scale values the last few decimal places may drift, but terabyte-scale conversions are exact.

Bytes to Terabytes Converter

Name: Bytes to Terabytes Converter
Availability: InStock
Author: Nham Vu

Enter a byte value and get the equivalent in terabytes (TB, decimal) and tebibytes (TiB, binary), plus a quick-reference table.

Input

Number of Bytes

Quick fill

Results

Enter a byte value and click Convert.

Reference Table

Common byte counts converted to TB and TiB.

Bytes	TB (decimal)	TiB (binary)	Common example
1,000,000,000,000	1.000000	0.909495	1 TB drive (labeled)
1,099,511,627,776	1.099512	1.000000	1 TiB (binary)
2,000,000,000,000	2.000000	1.818989	2 TB drive (labeled)
4,000,000,000,000	4.000000	3.637979	4 TB drive (labeled)
8,000,000,000,000	8.000000	7.275958	8 TB NAS drive
500,000,000,000	0.500000	0.454747	500 GB SSD
1,000,000,000,000,000	1,000.000000	909.495	1 petabyte (1 PB)

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Summary

Enter a byte value and get the equivalent in terabytes (TB, decimal) and tebibytes (TiB, binary), plus a quick-reference table.

How it works

Enter any byte value in the input field.
The converter divides by 10^12 to calculate terabytes (SI decimal).
It divides by 2^40 to calculate tebibytes (IEC binary).
Results update live as you type.
Copy any result with the copy button next to it.
The reference table shows pre-calculated common byte counts.

Use cases

Verify how much space a file or database backup occupies in terabytes.
Reconcile the gap between a drive's labeled TB capacity and the TiB shown by the OS.
Plan storage allocation for large datasets, video archives, or cloud backups.
Convert raw byte counts from filesystem APIs or monitoring tools into human-readable TB.
Compare SI and binary terabyte figures when sizing object-storage buckets.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu