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Download / Upload Time Calculator

Estimate how long a file will take to download or upload at a given speed.

Enter your values to calculate your result.

This assumes the full advertised speed with no overhead. Real-world transfers are usually slower due to network congestion, other devices sharing the connection, and server-side limits.

Formula

Time = File Size (bits) / Speed (bits per second)

File sizes are usually shown in bytes-based units (MB, GB), while connection speeds are usually advertised in bits-based units (Mbps) — since there are 8 bits in a byte, this converts both to a common unit before dividing.

Example

A 5 GB file on a 100 Mbps connection takes about 400 seconds (a bit under 7 minutes) at full speed.

Frequently Asked Questions

Does this work for uploads too?

Yes — the math is the same either way. Just enter your upload speed instead of your download speed.

Why is my actual download slower than this estimate?

Real-world speeds are typically lower than the advertised plan speed due to network overhead, congestion, other devices on the connection, and limits on the server you're downloading from.

Related Calculators

Data Transfer / Bandwidth Converter

Convert internet speeds between Mbps, MB/s, Gbps, and more.

Data Storage / File Size Converter

Convert between bits, bytes, KB, MB, GB, TB — including the 1000 vs. 1024 distinction.