📶

インターネット速度変換機

インターネット速度単位（Mbps、Gbps等）を変換し、ファイルダウンロード時間も計算できます。回線比較に便利。

Internet Speed

File Size

Include protocol overhead (Actual downloads are ~10% slower)

Estimated Download Time

1분 29초

1 GB @ 100 Mbps

Speed Unit Conversion

bps

100,000,000

Kbps

100,000

Mbps

100

Gbps

0.1

B/s

12,500,000

KB/s

12,500

MB/s

12.5

GB/s

0.0125

Download Times by File Size

🎵

Music File

5.0 MB

444ms

📷

HD Photo

10.0 MB

889ms

📹

Short Video

100.0 MB

8.9초

🎬

Movie (720p)

1.5 GB

2분 13초

🎥

Movie (1080p)

4.0 GB

5분 56초

📺

Movie (4K)

15.0 GB

22분 13초

🎮

Game

50.0 GB

1시간 14분

🕹️

Large Game

100.0 GB

2시간 28분

💻

OS Update

6.0 GB

8분 53초

💾

Full Backup

500.0 GB

12시간 21분

Internet Plan Comparison

Download time for 1 GB file by plan

Plan	Speed	Download Time
📱4G LTE	50 Mbps	2분 58초
🏠100 Mbps	100 Mbps	1분 29초
🏢500 Mbps	500 Mbps	17.8초
🚀Gigabit	1 Gbps	8.9초
📶5G	1 Gbps	8.9초
⚡2.5 Gbps	2.5 Gbps	3.6초
🔥10 Gbps	10 Gbps	889ms

Difference Between Bits and Bytes

Bit Units (Mbps, Gbps)

• 1 byte = 8 bits
• Used by ISPs in advertisements (100 Mbps, etc.)

Byte Units (MB/s, GB/s)

• 100 Mbps = 12.5 MB/s
• Shows actual download speed (12.5 MB/s, etc.)

Quick Reference

100 Mbps = 12.5 MB/s

1 Gbps = 125 MB/s

500 Mbps = 62.5 MB/s

10 Gbps = 1.25 GB/s

📖 使い方

Enter your internet speed (e.g., 100 Mbps)
Enter the file size (e.g., 4 GB)
Check the estimated download time
View speed conversions in various units
Compare internet plans to choose the right one

✨ 主な機能

✓Internet speed ↔ download time calculation
✓Conversion between various speed units (Mbps, Gbps, MB/s, etc.)
✓Quick calculation with file size presets
✓Download time comparison by internet plan
✓Optional protocol overhead calculation

📐 計算式

Download Time (seconds) = File Size (bits) ÷ Speed (bits/second)

💡 計算原理

•Internet speeds are usually displayed in bit units (Mbps, Gbps).
•1 Byte = 8 bits, so 100 Mbps = 12.5 MB/s.
•Actual download speeds are about 90% of advertised speeds (protocol overhead).
•Mbps means megabits per second, MB/s means megabytes per second.
•ISP advertised speeds like 100M, 500M, 1G mean 100Mbps, 500Mbps, 1Gbps respectively.

❓ よくある質問

Q. What's the difference between Mbps and MB/s?

A. Mbps is megabits per second, MB/s is megabytes per second. Since 1 byte = 8 bits, 100 Mbps = 12.5 MB/s.

Q. How fast is 100 Mbps in real terms?

A. 100 Mbps equals about 12.5 MB/s. Downloading a 1GB file takes approximately 80 seconds (1 minute 20 seconds).

Q. How fast can I download a 4K movie with gigabit internet?

A. A 15GB 4K movie theoretically downloads in about 2 minutes. Actual time may vary based on server speeds.

Q. Why is actual speed different from advertised speed?

A. Network protocol overhead, server conditions, concurrent users, and WiFi environment cause actual speeds to be 70-90% of advertised speeds.

Q. Which internet plan is right for me?

A. 100 Mbps for general browsing/streaming, 500 Mbps for HD streaming/remote work, Gigabit for large downloads/multiple users.

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