Why Internet Speed Units Are Confusing
Internet speeds are measured in megabits per second (Mbps), but file sizes are measured in megabytes (MB). The difference between a lowercase "b" and uppercase "B" represents an 8x difference in value — and ISPs always advertise in the smaller unit.
Bits vs Bytes
- 1 byte = 8 bits
- 1 Mbps (megabit per second) = 1,000,000 bits per second
- 1 MBps (megabyte per second) = 8,000,000 bits per second
So a 100 Mbps connection can transfer approximately 12.5 MB per second (100 ÷ 8 = 12.5).
Complete Unit Reference
| Unit | Full Name | Equivalent |
|---|---|---|
| 1 Kbps | Kilobit per second | 1,000 bits/s |
| 1 Mbps | Megabit per second | 1,000 Kbps |
| 1 Gbps | Gigabit per second | 1,000 Mbps |
| 1 KBps | Kilobyte per second | 8 Kbps |
| 1 MBps | Megabyte per second | 8 Mbps |
| 1 GBps | Gigabyte per second | 8 Gbps |
Real-World Download Time Examples
| File Size | 10 Mbps | 100 Mbps | 1 Gbps |
|---|---|---|---|
| 1 MB (photo) | 0.8s | 0.08s | instant |
| 100 MB (app) | 80s | 8s | 0.8s |
| 1 GB (movie) | 13 min | 80s | 8s |
| 50 GB (game) | 11 hrs | 67 min | 7 min |
Why ISPs Use Mbps Instead of MBps
ISPs advertise in megabits (Mbps) because the numbers are 8x larger, making plans sound faster. A "100 Mbps" plan sounds more impressive than "12.5 MBps" even though they're the same speed. This is legal and standard practice — just something to be aware of when comparing plans.
How to Convert Mbps to MBps
Divide by 8: Mbps ÷ 8 = MBps
- 10 Mbps = 1.25 MBps
- 50 Mbps = 6.25 MBps
- 100 Mbps = 12.5 MBps
- 500 Mbps = 62.5 MBps
- 1 Gbps = 125 MBps
What Speed Do You Actually Need?
Now that you understand the units, run our speed test to see your actual Mbps. Then divide by 8 to understand your real-world download speed in MBps — the number you'll see in your browser's download manager.