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Bandwidth & Download Time Calculator

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Bandwidth & Download Time Calculator

Calculate download time from file size and connection speed, or find the required speed to download a file within a time target. Supports all common file size units and speed presets (3G, 4G, 5G, Wi-Fi, broadband), with configurable protocol overhead percentage.

Cómo utilizar

Enter your file size, select your connection speed or choose a preset (3G, 4G, 5G, Fibre, etc.), set protocol overhead, and instantly see the estimated download time. Alternatively, work backwards from a target time to find the speed required.

Características

File size in any unit – B, KB, MB, GB, TB
Speed presets – 3G, 4G LTE, 5G, Wi-Fi 6, Fibre, and custom
Sobrecarga del protocolo – configurable percentage for real-world accuracy
Formatted output – shows days, hours, minutes, seconds
Reverse calculation – find required speed from target time
Actualizaciones en tiempo real – results update as you type

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 Preguntas frecuentes

What is protocol overhead and how does it affect download speed?

Protocol overhead is the extra data added by networking protocols on top of your payload. TCP/IP headers, HTTP headers, TLS handshake, and acknowledgement packets typically add 5–10% overhead. This means a 100 Mbps connection delivers roughly 90–95 Mbps of actual data. For large file transfers, overhead is relatively small. For many small HTTP requests, overhead can dominate and effective throughput drops significantly.
Why does my ISP-advertised speed differ from actual download speed?

ISPs advertise bandwidth in Mbps (megabits per second) while file sizes are shown in MB (megabytes), creating an 8x difference. A 100 Mbps connection downloads at 12.5 MB/s theoretically. Real-world speeds are lower due to: network congestion, Wi-Fi interference, server limitations, distance to CDN edge servers, and protocol overhead. Speeds also vary by time of day as ISPs share infrastructure among subscribers.
How do 4G and 5G speeds compare for large file downloads?

Theoretical peak speeds: 4G LTE up to 150 Mbps (typically 10–50 Mbps real-world), 5G Sub-6GHz up to 1 Gbps (typically 100–400 Mbps), 5G mmWave up to 10 Gbps (typically 1–3 Gbps in optimal conditions). Downloading a 1 GB file takes roughly 80–160 seconds on 4G vs 10–20 seconds on 5G Sub-6GHz. mmWave 5G can theoretically download 1 GB in under 1 second but requires being very close to a base station.
What is the relationship between bandwidth and latency for download speed?

Bandwidth is the maximum data transfer rate (pipe width). Latency is the delay before transfer begins (pipe length). For large file downloads, bandwidth dominates: a 1 GB file on a 100 Mbps / 100ms latency connection takes about the same time as on 100 Mbps / 10ms — the extra 90ms startup is negligible. For many small requests, latency dominates: 100 requests at 100ms latency each consume 10 seconds of latency alone regardless of bandwidth.