How do I calculate download time?

Download time (seconds) = File size in bits ÷ Speed in bps. Convert the file size to bits by multiplying bytes by 8. For example, a 1 GB file (8,000,000,000 bits) on a 100 Mbps (100,000,000 bps) connection takes 80 seconds.

How long does it take to download 1 GB on 100 Mbps?

1 GB on 100 Mbps takes approximately 80 seconds (1 minute 20 seconds). The formula is: (1,000,000,000 bytes × 8 bits) ÷ 100,000,000 bps = 80 seconds.

How do I convert Mbps to MB/s?

Divide Mbps by 8 to get MB/s. For example, 100 Mbps ÷ 8 = 12.5 MB/s. This is because 1 byte equals 8 bits.

Why is my actual download slower than my internet speed?

Actual download speeds are often lower than advertised due to network congestion, server limits, Wi-Fi signal quality, and overhead from the TCP/IP protocol. Expect 60–90% of your advertised speed in practice.

How long does it take to download 10 GB on 1 Gbps?

10 GB on 1 Gbps takes approximately 80 seconds. Formula: (10,000,000,000 × 8) ÷ 1,000,000,000 = 80 seconds.

Download Time Calculator

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Internet speeds have evolved dramatically over time, from early dial-up connections measured in kilobits per second to modern fiber and 5G connections capable of gigabit speeds. Because download speeds are measured in bits per second (bps) while file sizes are measured in bytes, converting between them requires remembering that 1 byte = 8 bits. The table below shows approximate average speeds for different connection technologies and the estimated time it would take to download a 1 GB file using each.

Connection Type	Average Speed	Download Time (1 GB)
Dial-Up Modem (1990s)	56 Kbps	~1.7 days
ISDN	128 Kbps	~17h 22m
Satellite (Early)	512 Kbps	~4h 20m
ADSL	8 Mbps	~16 min 40 sec
VDSL	25 Mbps	~5 min 20 sec
Cable Internet	100 Mbps	~1 min 20 sec
Wi-Fi (802.11g)	54 Mbps	~2 min 28 sec
Wi-Fi (802.11n)	150 Mbps	~53 sec
Wi-Fi (802.11ac)	433 Mbps	~18 sec
Wi-Fi 6 (802.11ax)	1.2 Gbps	~7 sec
3G Mobile	2 Mbps	~1h 7m
4G LTE	20 Mbps	~6 min 40 sec
5G Mobile	1 Gbps	~8 sec
Fiber (FTTH)	1 Gbps	~8 sec
High-End Fiber	10 Gbps	< 1 second

Note: Actual download speeds may vary due to network congestion, server limits, and signal quality. Speeds above are typical averages for each connection type.