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Feb 11, 2026
Megabits per second
Gigabytes
Estimated Time
1h 6m 40s
Real Speed
12.5 MB/s
Transfer Rate
450 MB/min
How to Use This Calculator
1
Enter Values
Fill in the required fields with your numbers.
2
Calculate
Click calculate or see results update in real time.
3
Read Results
View detailed breakdowns and explanations below.
📘 The 1/8th Rule
Real Speed (MB/s) = Advertised Speed (Mbps) / 8
Internet Service Providers (ISPs) always advertise in Megabits (Mbps) because the number is 8x larger than Megabytes (MB/s).
🧠 Bits vs Bytes
Bit (b): Used for Speed (Mbps).
Byte (B): Used for Storage (MB).
Note the capitalization! Small "b" is bits, Big "B" is Bytes.
✍️ Overhead
This calculator assumes 100% efficiency. In reality, you lose about 10% of speed to protocol overhead (TCP/IP headers). So if you have 100 Mbps, your real max is closer to 11 MB/s, not 12.5.
📊 Common Speeds
- 100 Mbps: Fast enough for 4K streaming.
- 300 Mbps: Good for families (multiple devices).
- 1 Gbps (1000 Mbps): Fiber optic. Downloads 50GB games in minutes.
✅ Key Takeaways
- Divide Mbps by 8 to get real download speed.
- Check casing: Mb vs MB.
- Wi-Fi is often slower than the plugged-in cable speed.
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