Bandwidth Calculator
Calculate file transfer time from size and connection speed. 10 size units, 10 speed units (bps/kbps/Mbps/Gbps + byte-per-sec). Comparison at 5 common speeds.
What powers the Bandwidth / File Transfer Time
File size: KB through TB (decimal + binary)
Speed: bps through Gbps + Bytes/sec
Bits vs bytes handled correctly
Comparison at dial-up / DSL / cable / fiber / datacenter speeds
Why the Bandwidth / File Transfer Time is different
Browser-native
The Bandwidth / File Transfer Time runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Cloud upload time estimation
- Bulk file transfer planning
- Network capacity planning
- Comparing ISP plans
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.