Bandwidth Calculator

Calculate download time, required bandwidth, or file size. Convert between Mbps, MBps, and estimate transfer times.

Bandwidth Results

Download Time

1 min 26 sec

Calculated result

File Size1.00 GB
Bandwidth100.00 Mbps
Time1 min 26 sec

What do you want to calculate?

Input Values

Result

Download Time

1 min 26 sec

File Size

1.00 GB

Bandwidth

100.00 Mbps

Time

1 min 26 sec

Common File Sizes

Common Connection Speeds

Download Time Comparison

File Size10 Mbps50 Mbps100 Mbps1 Gbps
100 MB1 min 24 sec16.78 seconds8.39 seconds838.86 ms
1 GB14 min 19 sec2 min 52 sec1 min 26 sec8.59 seconds
5 GB1 hr 11 min14 min 19 sec7 min 9 sec42.95 seconds
25 GB5 hr 57 min1 hr 11 min35 min 47 sec3 min 35 sec
100 GB23 hr 51 min4 hr 46 min2 hr 23 min14 min 19 sec

Unit Conversion Reference

Speed (bits)

  • 1 Kbps = 1,000 bps
  • 1 Mbps = 1,000 Kbps = 1,000,000 bps
  • 1 Gbps = 1,000 Mbps = 1,000,000,000 bps

Size (bytes)

  • 1 KB = 1,024 B
  • 1 MB = 1,024 KB = 1,048,576 B
  • 1 GB = 1,024 MB = 1,073,741,824 B
  • 1 TB = 1,024 GB

Key: 1 Byte = 8 bits. To convert Mbps to MBps, divide by 8.

Quick Answer

To calculate download time: divide file size by bandwidth speed. Remember to convert units: 1 byte = 8 bits, so Mbps (megabits) / 8 = MB/s (megabytes). Formula: Time (seconds) = File Size (MB) / (Speed Mbps / 8). A 1GB file at 100 Mbps: 1000 MB / 12.5 MB/s = 80 seconds. Real speeds are typically 80-90% of advertised due to overhead.

Key Facts

  • 1 byte = 8 bits; Mbps (megabits) / 8 = MB/s (megabytes)
  • 100 Mbps = 12.5 MB/s theoretical max
  • Actual throughput is typically 80-90% of advertised speed
  • 1 Gbps = 1000 Mbps = 125 MB/s
  • Netflix HD: 5 Mbps; 4K: 25 Mbps per stream
  • Video call: 2-4 Mbps; Online gaming: 3-6 Mbps
  • Latency (ping) matters more than bandwidth for gaming
  • Upload speed is typically 10-20% of download speed

Frequently Asked Questions

Mbps (megabits per second) measures network speed. MBps (megabytes per second) measures data transfer. 1 byte = 8 bits, so 100 Mbps = 12.5 MBps. ISPs advertise in Mbps; file downloads often show MBps.
Reasons include: protocol overhead (~10-15%), network congestion, distance from server, Wi-Fi interference, old router/modem, ISP throttling, and server limitations. Typical real-world speeds are 50-80% of advertised.
SD video: 3-4 Mbps. HD (1080p): 5-8 Mbps. 4K: 25+ Mbps. Video calls: 2-4 Mbps. Online gaming: 3-6 Mbps (low latency matters more). Multiple users multiply requirements.
Latency (ping) is the delay before data transfer starts, measured in milliseconds. It affects responsiveness but not bulk download speed. Low latency (<50ms) matters for gaming and video calls, not large file downloads.
Bits to bytes: divide by 8. Kilo (K) = 1,000 (or 1,024 for binary). Mega (M) = 1,000,000. Giga (G) = 1,000,000,000. Network uses decimal (1 KB = 1000 B), storage uses binary (1 KB = 1024 B).