Download Time Calculator
Estimate how long a file will take to download based on its size and your connection speed.
File size
Connection speed
Estimated download time
1m 22s
Effective throughput: about 100 Mbps
Enter a file size and your connection speed to estimate download time, correctly accounting for the difference between bits (Mbps) and bytes (MB/s). Calculations happen instantly in your browser.
How to use
- Enter the file size and choose its unit (KB, MB, GB, TB).
- Enter your connection speed and choose bits-per-second or bytes-per-second units.
- Read the estimated download time.
Frequently asked questions
- Why does my download take longer than expected from the advertised speed?
- Internet speeds are usually advertised in megabits per second (Mbps), but file sizes are shown in megabytes (MB) — 1 byte equals 8 bits, so this tool converts between the two automatically.
- Does this account for real-world network overhead?
- This gives a theoretical estimate at full speed; actual downloads are often slower due to network overhead, congestion, and server limits.
- What size units are supported?
- File size supports bytes through terabytes (binary/1024-based), and speed supports bits and bytes per second from single units up to gigabits/gigabytes.