Why is actual download speed slower than advertised?

ISP speeds are theoretical maximums. Overhead (TCP/IP headers, retransmissions), network congestion, WiFi interference, and server limitations typically reduce real-world speeds by 20–40%.

How many Mbps is fast internet?

Per the FCC: 25 Mbps down = broadband minimum. 100 Mbps is good for streaming and gaming. 500+ Mbps is very fast. Gigabit (1000 Mbps) is top-tier.

Download Speed Calculator — Time to Download

Quick answer: Enter file size (MB) and internet speed (Mbps) to calculate download time.

Calculate how long it will take to download any file at your internet connection speed. Enter file size in MB or GB and your speed in Mbps.

Last reviewed: April 2026Report an error

File Size (MB)

Download Speed (Mbps)

Download Time

1m 20s

Download time: 1m 20s (80.0 seconds).

Time

1m 20s

Seconds

80.0

Minutes

1.33

How to Use This Download Speed Calculator

1Enter the file size in megabytes (MB). Tip: 1 GB = 1,024 MB.
2Enter your internet download speed in Mbps.
3Read download time in seconds, minutes, and hours.

Frequently Asked Questions

: ISP speeds are theoretical maximums. Overhead (TCP/IP headers, retransmissions), network congestion, WiFi interference, and server limitations typically reduce real-world speeds by 20–40%.
: Per the FCC: 25 Mbps down = broadband minimum. 100 Mbps is good for streaming and gaming. 500+ Mbps is very fast. Gigabit (1000 Mbps) is top-tier.

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Download Speed Calculator — Time to Download

How to Use This Download Speed Calculator

Frequently Asked Questions

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