Is Bandwidth Calculator free?

Yes, Bandwidth Calculator is completely free. No signup, no subscription, no hidden fees.

Is my data safe when using Bandwidth Calculator?

Absolutely. Bandwidth Calculator runs 100% in your browser. Your data never leaves your device.

No installation required. Bandwidth Calculator works directly in any modern web browser.

Math & Logic

Calculate file transfer time from size and speed, or find required bandwidth for a target time.

File Size

Speed

Common Scenarios

Estimated Transfer Time: 1m 25s

File: 1 GB (1,073,741,824 bytes) Speed: 100 Mbps Total bits: 8,589,934,592 Time: 1m 25s (85.90s)