Bandwidth Calculator
How long to download or upload a file? Enter file size and connection speed.
Quick answer: 1 GB file on 100 Mbps = ~89 seconds. 10 GB on 1 Gbps fibre = ~89 seconds. 100 Mbps / 8 = 12.5 MB/s — ISPs sell bits, apps report bytes.
Mbps vs MB/s
ISPs advertise in Mbps (megabits per second). Download speeds shown by apps are often MB/s (megabytes). 100 Mbps = 12.5 MB/s. Always divide by 8 to convert bits to bytes.
Average Internet Speeds by Country (2024)
| Country | Avg fixed download | Avg mobile | Note |
|---|---|---|---|
| 🇸🇬 Singapore | ~290 Mbps | ~110 Mbps | Among fastest globally |
| 🇰🇷 South Korea | ~270 Mbps | ~210 Mbps | 5G leader; nationwide gigabit |
| 🇺🇸 USA | ~240 Mbps | ~90 Mbps | Wide variation by region |
| 🇬🇧 UK | ~140 Mbps | ~60 Mbps | FTTP rollout ongoing |
| 🇩🇪 Germany | ~130 Mbps | ~65 Mbps | Copper-heavy; fibre lagging EU peers |
| 🇦🇺 Australia | ~110 Mbps | ~55 Mbps | NBN mixed-technology rollout |
| 🇨🇳 China | ~200 Mbps | ~100 Mbps | Massive fibre rollout last decade |
| 🇮🇳 India | ~55 Mbps | ~40 Mbps | Jio drove rapid mobile expansion |
| 🇧🇷 Brazil | ~120 Mbps | ~35 Mbps | Urban areas well-served |
Frequently Asked Questions
What is protocol overhead and why does it reduce my speed?
Real network traffic includes headers, error-checking, and acknowledgement packets beyond your raw data. TCP/IP adds about 3-5% overhead. Wi-Fi adds another 5-10% due to framing and collision avoidance. HTTPS encryption adds minimal overhead. Using 10% as a rule of thumb gives a realistic estimate for actual transfer speeds.
How do data caps work internationally?
Data caps limit monthly data usage. In the US, many ISPs cap residential service at 1-1.2 TB/month. In Europe, most fibre plans are unlimited. Australia NBN plans often have data allowances of 200GB-500GB, though unlimited plans are common. Mobile data caps vary widely — Indian plans offer cheap 1.5-2GB/day, while US carriers charge premiums for unlimited.
What affects real-world download speed vs advertised speed?
Distance from server, network congestion, Wi-Fi vs wired connection, ISP throttling, VPN overhead, and server upload speed all affect real speeds. Speed test tools like Speedtest.net measure the connection to nearby servers — real download speeds to distant servers (e.g. a game from a European server to Australia) may be 20-40% lower.