Download time estimator

File size ÷ connection speed → a best-case transfer time.

Calculated in this browser. Nothing is sent anywhere.

Best-case math — real transfers slow with congestion, Wi-Fi overhead, server limits, and protocol cost (often 10–30% slower than this estimate). Sizes up to 1e+15 and speeds to 1e+12.

How to use

  1. Enter the file size.
  2. Enter your connection speed.
  3. Read the estimate.

What it supports

Best-case math — real transfers run slower with overhead, congestion, and server limits. No progress simulation or speed test.

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