Calculators & Planners

Tech Unit Converter

Convert storage sizes and internet speeds exactly — decimal (MB, GB) and binary (MiB, GiB) side by side — and work out how long a download will take.

Convert

Result

1,000

MB (megabyte)

1 GB = 1,000 MB

1 GB in every unit

MB and MiB are not the same: decimal units count in 1000s, binary units in 1024s.

Decimal (SI)

Powers of 1000 — used on drive boxes, macOS and ISPs

KB
1,000,000
MB
1,000
GB
1
TB
0.001
PB
1e-6

Binary (IEC)

Powers of 1024 — what Windows and RAM really count

KiB
976,562.5
MiB
953.6743
GiB
0.9313
TiB
0.0009
PiB
8.8818e-7

Bits & bytes

1 byte = 8 bits

bit
8,000,000,000
B
1,000,000,000

Quick conversions

Tap one to load it into the converter.

Download time calculator

How long a file takes at a given connection speed, assuming the speed holds the whole time.

Estimated download time

1 min 20 s

80 seconds

Real downloads are usually 5–15% slower because of network overhead and server limits.

Data you can move at this speed

Per minute
750 MB · 715.26 MiB
Per hour
45 GB · 41.91 GiB
Per day
1.08 TB · 1,005.83 GiB

  • Exact answers

    Conversions use exact whole-number maths, so 1 GiB is exactly 1,073,741,824 bytes — no rounding noise.

  • MB and MiB, clearly

    Decimal (1000) and binary (1024) units are shown side by side, so you can see why a 1 TB drive shows 931 GB.

  • Download time

    Enter a file size and your internet speed to estimate the download time and how much data you use per hour.

Storage and bandwidth units, explained

Computers count in two different ways. Drive makers, internet providers and macOS use decimal (SI) units, where every step is 1000. Windows, RAM and many programs use binary (IEC) units, where every step is 1024 — but often still label them KB, MB and GB. This converter keeps the two apart: MB always means 1,000,000 bytes and MiB always means 1,048,576 bytes.

Storage units

  • 1 byte (B) = 8 bits
  • Decimal: 1 KB = 1,000 B · 1 MB = 1,000 KB · 1 GB = 1,000 MB · 1 TB = 1,000 GB
  • Binary: 1 KiB = 1,024 B · 1 MiB = 1,024 KiB · 1 GiB = 1,024 MiB · 1 TiB = 1,024 GiB
  • A “1 TB” drive holds 1,000,000,000,000 bytes, which is about 931 GiB — that is why your computer shows less space than the box promised.

Internet speed: Mbps vs MB/s

Internet packages are sold in megabits per second (Mbps), but browsers and download managers show megabytes per second (MB/s). Since one byte is 8 bits, divide by 8: a 100 Mbps connection downloads at most 12.5 MB/s, and a 20 Mbps package at most 2.5 MB/s.

How download time is calculated

time (seconds) = file size in bits ÷ speed in bits per second. For example, a 1 GB file (8,000,000,000 bits) on a 100 Mbps line takes 80 seconds; a 1 GiB file takes about 86 seconds. Real downloads are a little slower because of network overhead, Wi-Fi quality and server limits.

Time units

The time converter goes from nanoseconds to weeks — handy for API timeouts, cache lifetimes and benchmark results. 1 hour = 3,600,000 ms.

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