What is the difference between MB and MiB?

MB (Megabyte) uses the decimal system (1 MB = 1,000,000 bytes = 1,000 KB). MiB (Mebibyte) uses binary (1 MiB = 1,048,576 bytes = 1,024 KiB). Operating systems like Windows report storage in binary GiB/MiB.

How are download times calculated?

Download times convert file bytes to bits (1 Byte = 8 bits) and divide by the transfer speed in Mbps/Gbps.

What do I need to enter?

Just Data / File Size and Unit. Every field has a sensible default you can start from.

Is my data uploaded anywhere?

No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.

Does it work on a phone?

Yes. The layout adapts to small screens and needs no app or signup.

File Size Converter

Convert between Bytes, KB, MB, GB, TB, PB, KiB, and GiB with download time estimates.

100% free
Private in browser
No signup
No watermarks

Data / File Size

Unit

Decimal Units (Base 10 - 1,000x)

Bytes5.0000e+9

Kilobytes (KB)5.0000e+6

Megabytes (MB)5,000

Gigabytes (GB)5

Terabytes (TB)0.005

Petabytes (PB)5.0000e-6

Binary Units (Base 2 - 1,024x IEC)

Kibibytes (KiB)4.8828e+6

Mebibytes (MiB)4,768.3716

Gibibytes (GiB)4.6566

Tebibytes (TiB)0.0045

Estimated Download / Transfer Times

3G Mobile (2 Mbps)

5h 33m

4G LTE (25 Mbps)

26m 40s

Standard Broadband (50 Mbps)

13m 20s

5G Fast (150 Mbps)

4m 27s

Fiber Gigabit (1000 Mbps)

40 seconds

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About File Size Converter

Convert digital data storage and file sizes effortlessly across all units. File Size Converter on TheToolss converts between standard decimal units (Bytes, KB, MB, GB, TB, PB) and binary IEC units (KiB, MiB, GiB, TiB), while displaying estimated download and upload times across 4G, 5G, and high-speed broadband connections.

How to use File Size Converter

Enter the file size or data storage quantity.
Select the unit of measurement (e.g., MB, GB, GiB).
View instant decimal and binary conversions across all storage tiers.
Check the estimated transfer times for various internet download speeds.

Key features

Converts Decimal (KB, MB, GB, TB) and Binary (KiB, MiB, GiB)
Precise multi-tier unit breakdown
Real-time internet transfer and download time calculator
Supports massive scales from Bytes up to Petabytes
100% private in-browser client execution

Frequently asked questions

What is the difference between MB and MiB?: MB (Megabyte) uses the decimal system (1 MB = 1,000,000 bytes = 1,000 KB). MiB (Mebibyte) uses binary (1 MiB = 1,048,576 bytes = 1,024 KiB). Operating systems like Windows report storage in binary GiB/MiB.
How are download times calculated?: Download times convert file bytes to bits (1 Byte = 8 bits) and divide by the transfer speed in Mbps/Gbps.
What do I need to enter?: Just Data / File Size and Unit. Every field has a sensible default you can start from.
Is my data uploaded anywhere?: No. The calculation runs in your browser with JavaScript — nothing you type is sent to a server or stored.
Does it work on a phone?: Yes. The layout adapts to small screens and needs no app or signup.

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