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Download Time Calculator

Estimate how long a file takes to download at a given connection speed.

Inputs

Internet speeds are advertised in megabits per second (Mbps), not megabytes.

File Size (MB)
Connection Speed (Mbps)

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Saved Scenarios

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Inputs updated · Results recalculated · Just now

Download Time (seconds)

40.0

Spark says

How it's calculated
From below of long thin blue cables connected to row of small white connectors on system block in data center
Photo by Brett Sayles on Pexels
A complex network of cables in a data center with a monitor in the foreground.
Photo by panumas nikhomkhai on Pexels

Formula

Seconds=File SizeMB×8SpeedMbpsSeconds = \dfrac{File\ Size_{MB} \times 8}{Speed_{Mbps}}
\times 8
— Converts megabytes to megabits

What is the Download Time Calculator?

This calculator converts a file size in megabytes to a download time by dividing by connection speed — converting bytes to bits first, since internet speeds are measured in bits per second.

How to use it

  1. 1 Enter the file size in megabytes.
  2. 2 Enter your connection speed in megabits per second.

Worked examples

500MB file at 100 Mbps

About 40 seconds at full speed.

Try it

Limitations

  • •Assumes 100% of the connection is available and sustained — actual downloads are often slower due to overhead, server limits, or network congestion.

Frequently asked questions

Why is my download slower than this calculator predicts?

Real-world speeds are affected by server-side limits, network congestion, Wi-Fi overhead, and protocol overhead — this calculator shows the theoretical best case.

calixo.cloud/developer/download-time-calculator/ — free calculator, no signup required.