Download Time Calculator
See how long any file takes to download on 3G, 4G, 5G, ADSL, cable or fiber — and the speed you need to move it within a deadline. Free and instant.
Time on common connections
| Connection | Speed | Download time |
|---|---|---|
| – | ||
About Download Time Calculator
The download time calculator tells you how long a file of any size takes to transfer over any connection. Enter the file size in kB, MB, GB or TB, pick your connection speed in Kbps, Mbps or Gbps — or grab a preset for 3G, 4G, 5G, ADSL, cable, Starlink or fiber — and the estimated transfer time updates instantly as you type.
The calculation accounts for protocol overhead: advertised speeds are raw line rates, but TCP/IP, TLS and Wi-Fi framing typically consume 5–15% of them, so the tool applies an adjustable overhead percentage before converting bits per second into a realistic duration. A comparison table shows the same file on every common connection tier, so you can see at a glance what an upgrade would buy you.
It also works in reverse: switch to the required-speed mode, set a target time, and it computes the connection speed you need to move that file within the deadline — handy for planning backups, large uploads, media deliveries or choosing an internet plan. Everything runs in your browser and is free to use.
How to use Download Time Calculator
- Enter the file size and pick its unit — switch between decimal (1 MB = 1,000 kB) and binary (1 MiB = 1,024 KiB) units if needed.
- Set your connection speed manually, or click a preset such as 4G LTE, 5G, cable or gigabit fiber.
- Adjust the protocol overhead percentage if you want a more or less conservative estimate.
- Read the estimated download time and compare it across common connection tiers in the table.
- To plan for a deadline, switch to the required-speed mode, enter the target time, and read the speed you need.