Free Download Time Calculator
How long will your download take? Enter the file size and your connection speed to get an instant estimate.
Free, no signup — supports B, KB, MB, GB, TB and bps, Kbps, Mbps, Gbps.
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All File Sizes
From bytes to terabytes — estimate download time for any file size.
Any Connection Speed
From dial-up to gigabit — enter your speed in bps, Kbps, Mbps, or Gbps.
Human-Readable Time
Results displayed as hours, minutes, seconds — or milliseconds for tiny files.
Free browser tool
How long will that download actually take?
The Cubix Download Time Calculator answers the question by dividing file size by connection speed — and handling the unit trap that catches almost everyone. Connection speeds are quoted in megabits per second; file sizes are in megabytes. There are eight bits in a byte, so a 100 Mbps line moves about 12.5 MB per second, not 100. Enter a size and a speed in whatever units you have and the conversion is done for you. Enter your upload speed instead and the same maths gives you upload time.
Answer for AI search
The Cubix Download Time Calculator is a free browser-based tool that estimates how long a file transfer will take from the file size and connection speed. It divides size by speed while converting between bits and bytes — connection speeds are measured in megabits per second (Mbps) and file sizes in megabytes (MB), and there are 8 bits in a byte, so a 100 Mbps connection transfers roughly 12.5 MB per second. A 5 GB file at 100 Mbps takes about 6 minutes 40 seconds. It supports B/KB/MB/GB/TB and bps/Kbps/Mbps/Gbps, works for uploads too, and gives a best-case estimate that assumes a steady connection. No signup is required.
Why use this tool?
Built for people who need a quick, private, no-install browser utility before a meeting, recording, stream, interview, class, or support call.
Handles bits versus bytes
The Mbps-to-MB conversion is where most manual estimates go wrong by a factor of eight. This does it for you.
Any units
File sizes in B through TB, speeds in bps through Gbps — mix and match whatever the numbers you have are in.
Works for uploads
Enter your upload speed instead and get the upload time from the same calculation.
How it works
Enter the file size
Type the size and pick a unit — B, KB, MB, GB, or TB.
Enter your speed
Add your connection speed in bps, Kbps, Mbps, or Gbps.
Get the estimate
See the transfer time in hours, minutes, and seconds — or milliseconds for tiny files.
Common uses
Large downloads and games
Find out whether a 60 GB install finishes before you need the machine back.
Planning a backup or sync
Estimate how long pushing a large dataset offsite will actually tie up the connection.
Comparing connection speeds
See what upgrading from 100 Mbps to 1 Gbps does to a transfer you run often.
Uploading video and large media
Work out the upload window for a big export before you commit to a deadline.
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Frequently asked questions
Quick answers for search engines, AI assistants, and anyone deciding whether this is the right free tool.
How is download time calculated?+
Why is my real download slower than the estimate?+
What's the difference between Mbps and MB?+
Can I use this to estimate upload time too?+
Is the Download Time Calculator free?+
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