In 1 terabytes there are 1,000,000 megabytes. Meanwhile in 1 megabytes there are 0.00000100000 terabytes. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Megabytes to Terabytes calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert terabytes (TB) to megabytes (MB), you need to pick the right system. Most computer storage uses the binary (base-2) system.
Formula:
Quick examples:
Tip: If you see storage labeled using decimal (base-10) terms, the numbers change, but for most file size and system use, TB to MB conversions follow 1,048,576 MB per TB.
It depends on which system you use. In base-10 (decimal), 1 terabyte (TB) equals 1,000,000 megabytes (MB). In base-2 (binary), 1 tebibyte (TiB) equals 1,048,576 mebibytes (MiB). Many storage makers use decimal TB, while many operating systems report sizes closer to binary units.
Both numbers are used, but they describe different standards.
TB (terabyte) is usually a decimal unit: 1 TB = 10¹² bytes.
TiB (tebibyte) is a binary unit: 1 TiB = 2⁴⁰ bytes.
They measure similar sizes, but they are not the same. That’s why a “1 TB” drive may show as about “0.91 TB” in some systems.
Use the standard that matches your need:
Using decimal units, 2 TB = 2 × 1,000,000 = 2,000,000 MB.
Using binary units, 2 TiB = 2 × 1,048,576 = 2,097,152 MiB.
The label “MB” is often decimal, while “MiB” is binary.
Using decimal units, 0.5 TB = 0.5 × 1,000,000 = 500,000 MB.
Using binary units, 0.5 TiB = 0.5 × 1,048,576 = 524,288 MiB.
Drive makers often label size in decimal TB (1 TB = 1,000,000,000,000 bytes). Some operating systems report using binary units (GiB or TiB), which makes the number look smaller. File system formatting and reserved space also reduce the usable space.
No. MB usually means decimal megabytes (1 MB = 1,000,000 bytes). MiB means binary mebibytes (1 MiB = 1,048,576 bytes). The difference adds up at larger sizes, like terabytes.
For most consumer storage labels (SSDs, HDDs, USB drives), use decimal: TB to MB with 1,000,000. For memory and many system reports, binary units are common (GiB, TiB), which aligns with MiB. Always match the unit shown: MB with TB (decimal), MiB with TiB (binary).
Yes. Convert through bytes if you want a clear path.
Most internet plans and file sizes use decimal-style labels, but reporting can vary by app or device. If your plan lists data in GB or TB, it often follows decimal math, where 1 TB equals 1,000,000 MB. Check how your device reports usage if the totals don’t match.
Here are common decimal conversions:
The Calculate Box tool to convert terabytes to megabytes uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a terabytes value in the box and have it instantly converted to megabytes.