Transfer Time Converter

Time in seconds equals data size in bits divided by effective payload bits per second. Effective rate is nominal rate multiplied by (1 − overhead/100). For example, 1 decimal GB at 100 Mbit/s takes 80 seconds with zero overhead, or 100 seconds with 20% unavailable bandwidth.

It is the share of the nominal bandwidth unavailable to useful payload. It is not extra file size. A 10% overhead leaves 90% of the nominal rate. You supply this assumption; no default network loss is guessed. Leave it at 0 if you already know actual usable throughput. Blank means 0; supported values are 0–99.9%.

No. It estimates duration at the constant rate you enter. Connection fluctuations, server limits, latency, handshakes, retries and other traffic can change real completion time. No network traffic is generated to test your connection.

No. GB is 1,000,000,000 bytes; GiB is 1,073,741,824 bytes. Mbps means Mbit/s. MB/s means megabytes per second, with eight bits per byte. Both amount and rate selectors label decimal and binary units separately.

A zero data amount produces zero duration, but a positive rate is always required. Negative values and zero rate are rejected. Decimal/scientific inputs support up to 120 digits, 180 characters and exponents −500 to 500. The clock rounds to milliseconds; exact calculated seconds remain available even for shorter durations.

Yes. Use your upload rate for uploads, download rate for downloads, or the relevant sustained rate for local file copies. The arithmetic is the same. It does not infer which direction or device speed applies.

No. Calculation happens locally and inputs are not persisted. Only your theme preference is saved. Copy and TXT download happen only when you choose.