Internet Bandwidth Units: bps, Kbps, Mbps, Gbps and How to Convert

Hello my friend! 🌐 Your internet package say 100 Mbps, but when you download file, browser show only 12 MB/s. Internet company cheat you? 🤔 No! Today we learn internet bandwidth unit — bps, Kbps, Mbps, Gbps — and how to convert. After this, you can calculate download time by yourself!

1. What Is Bandwidth?

Bandwidth is how much data can go through your internet connection in one second. Think about water pipe 🚰: bigger pipe = more water flow each second.

Some word you need know:

• Bandwidth: Maximum data can send per second (size of pipe). This is number in your internet package.
• Speed / Throughput: Real data you get per second. Usually a bit less than bandwidth.
• Download: Data come to your computer (watch video, download file).
• Upload: Data go from your computer (send file, video call, live stream).
• Latency (Ping): Time for data go and come back, measure in millisecond (ms). Small number = better. Very important for game and video call.

2. Bandwidth Unit Table

Bandwidth always measure in bit per second (small b), not Byte.

Unit	Short	Size	Real-life example
Bit per second	bps	1 bit/s	Very old modem
Kilobit per second	Kbps	1,000 bps	Old dial-up internet (56 Kbps)
Megabit per second	Mbps	1,000 Kbps	Home internet, 4G mobile
Gigabit per second	Gbps	1,000 Mbps	Fiber internet, office LAN, 5G
Terabit per second	Tbps	1,000 Gbps	ISP backbone, data center
Petabit per second	Pbps	1,000 Tbps	Undersea internet cable total

Good news: network unit always use 1,000, not 1,024. More easy than storage unit!

3. The Most Important: Mbps vs MB/s

This is where everybody confuse:

• Mbps (small b) = Megabit per second → internet package, Wi-Fi, speed test
• MB/s (big B) = MegaByte per second → download speed in browser, Steam, file copy

Because 1 Byte = 8 bit:

Mbps → MB/s:   divide by 8
MB/s → Mbps:   multiply by 8

100 Mbps ÷ 8 = 12.5 MB/s
 10 MB/s × 8 = 80 Mbps

So 100 Mbps package give you max about 12.5 MB/s download. Nobody cheat you! 😄

Internet package	Max download speed
10 Mbps	1.25 MB/s
20 Mbps	2.5 MB/s
50 Mbps	6.25 MB/s
100 Mbps	12.5 MB/s
200 Mbps	25 MB/s
500 Mbps	62.5 MB/s
1 Gbps	125 MB/s
10 Gbps	1,250 MB/s

4. How to Convert — Easy Method

Same rule like storage unit, but always 1,000:

• ⬆️ Small unit → Big unit: Divide ÷ 1,000
• ⬇️ Big unit → Small unit: Multiply × 1,000
• 🔄 bit ↔ Byte: ÷ 8 or × 8

        × 1,000       × 1,000       × 1,000
  Gbps ─────────▶ Mbps ─────────▶ Kbps ─────────▶ bps
  Gbps ◀───────── Mbps ◀───────── Kbps ◀───────── bps
        ÷ 1,000       ÷ 1,000       ÷ 1,000

Example 1: Gbps → Mbps

2.5 Gbps = 2.5 × 1,000 = 2,500 Mbps

Example 2: Kbps → Mbps

2,048 Kbps = 2,048 ÷ 1,000 = 2.048 Mbps

Example 3: Gbps → MB/s (2 step)

1 Gbps = 1,000 Mbps        (× 1,000)
1,000 Mbps ÷ 8 = 125 MB/s  (÷ 8)

Example 4: MB/s → Mbps

Browser show download 6 MB/s. How many Mbps you really get?

6 MB/s × 8 = 48 Mbps

Quick Conversion Table

From → To	Do this
Kbps → Mbps	÷ 1,000
Mbps → Gbps	÷ 1,000
Gbps → Tbps	÷ 1,000
Gbps → Mbps	× 1,000
Mbps → Kbps	× 1,000
Mbps → MB/s	÷ 8
MB/s → Mbps	× 8
Gbps → MB/s	× 1,000 ÷ 8 (= × 125)

5. Calculate Download Time

Use this formula:

Time (second) = File size (MB) ÷ Speed (MB/s)

Remember change Mbps to MB/s first (÷ 8)!

Example: Download 50 GB game with 200 Mbps internet

Step 1: File size  → 50 GB = 50,000 MB
Step 2: Speed      → 200 Mbps ÷ 8 = 25 MB/s
Step 3: Time       → 50,000 ÷ 25 = 2,000 second
Step 4: To minute  → 2,000 ÷ 60 ≈ 33 minute

How Long to Download 1 GB File?

Internet speed	MB/s	Time for 1 GB
10 Mbps	1.25 MB/s	≈ 13 min 20 sec
50 Mbps	6.25 MB/s	≈ 2 min 40 sec
100 Mbps	12.5 MB/s	≈ 1 min 20 sec
500 Mbps	62.5 MB/s	≈ 16 sec
1 Gbps	125 MB/s	≈ 8 sec

(This is best case. Real life a bit slower, because server, Wi-Fi, and other user share the line.)

How Much Data Use in 1 Hour?

If you download full speed for 1 hour with 100 Mbps:

12.5 MB/s × 3,600 second = 45,000 MB = 45 GB

Good to know when you use mobile data with limit!

6. Common Network Speed

Cable (Ethernet)

Name	Max speed	Cable
Fast Ethernet	100 Mbps	Cat5
Gigabit Ethernet	1 Gbps	Cat5e, Cat6
2.5 Gigabit	2.5 Gbps	Cat5e, Cat6
10 Gigabit	10 Gbps	Cat6 (up to 55 m), Cat6a (up to 100 m)

Wi-Fi (maximum in theory)

Wi-Fi	Standard	Max speed
Wi-Fi 4	802.11n	600 Mbps
Wi-Fi 5	802.11ac	3.5 Gbps
Wi-Fi 6 / 6E	802.11ax	9.6 Gbps
Wi-Fi 7	802.11be	about 46 Gbps

Real Wi-Fi speed is much lower than this — wall, distance, and many device make it slow.

How Much Speed You Need? (about)

Activity	Need about
Email, browse web	1–5 Mbps
Video call (HD)	3–5 Mbps
YouTube / Netflix HD (1080p)	5 Mbps
4K video	15–25 Mbps
Online game	3–10 Mbps (but low ping more important!)
Family with many device	100 Mbps or more

Ping (Latency)

Ping	Quality
Below 20 ms	Excellent — good for game
20–50 ms	Good
50–100 ms	OK for normal use
Over 100 ms	Lag, video call not smooth

Tips

• Small b = bit (internet speed), big B = Byte (file size). Always check letter!
• To change Mbps to MB/s, divide by 8. To change MB/s to Mbps, multiply by 8.
• Network unit always use 1,000, never 1,024. Easy!
• Test your real speed at speedtest.net or fast.com. Test with cable, not Wi-Fi, to check what internet company really give.
• Your internet only fast as the slowest part. 1 Gbps package + old 100 Mbps cable or router = max 100 Mbps!
• For game and video call, low ping is more important than high Mbps.
• Check upload speed too, special if you do live stream, video call, or upload to cloud.
• In Windows, see your network link speed: Settings → Network & internet → Wi-Fi (or Ethernet) → Hardware properties.

Conclusion

Now you understand bandwidth unit from bps until Tbps, and the big secret: divide Mbps by 8 to get MB/s. You can calculate download time, choose right internet package, and know why 100 Mbps show 12.5 MB/s. Keep learning my friend! 💡

Related Posts

• Learn computer storage units: bit, byte, KB, MB, GB, TB, PB and how to convert
• Chapter 7 - Networking concepts, LAN, WAN, and ISP
• Chapter 8 - Router, switch, Wi-Fi access point, and Ethernet cable
• Chapter 9 - Laptop and mobile device configuration
• See all chapters of computer fundamentals