Category: Calculators
File Transfer Time Calculator
Estimate download or upload time from file size and speed
Enter a file size and a transfer speed to estimate how long a download or upload will take. Everything runs in your browser.
Estimated transfer time1 minutes, 26 seconds
Everything on this page is processed in your browser. Nothing is uploaded.
What this tool does
This calculator converts the file size and transfer speed to a common unit — bytes and bytes per second — correctly accounting for the difference between bits and bytes, then divides one by the other to estimate the transfer time.
How to use it
- Enter the file size and choose its unit.
- Enter the transfer speed and choose its unit.
- Read the estimated transfer time.
Privacy
This tool runs entirely in your browser. Your input is never uploaded, stored or shared — closing the tab removes it.
Frequently asked questions
- Is my file uploaded to check its size?
- No. This calculator only uses the numbers you type and runs entirely in your browser; no file is ever selected or sent anywhere.
- Why is my download slower than my plan's advertised speed?
- Internet plans are usually advertised in megabits per second (Mbps), while file sizes and download managers are usually shown in megabytes (MB). Since one byte is eight bits, a '100 Mbps' connection tops out around 12.5 MB per second, before accounting for real-world overhead.
- Does this account for network overhead?
- No. This is a best-case estimate based on the raw file size and speed you enter; real transfers are usually slower due to protocol overhead, other network traffic and server limits.