Gigabits per second (Gbps)

Gigabytes per second (GB/s)

Formula: GB/s = Gbps ÷ 8

8 bits = 1 byte

File Transfer Time at Current Speed

File Size

Transfer Time:

Common Transfer Scenarios:

Common Network Speeds

1 Gbps

= 0.125 GB/s

Gigabit Ethernet

2.5 Gbps

= 0.3125 GB/s

Multi-Gig Ethernet

10 Gbps

= 1.25 GB/s

10 Gigabit Ethernet

25 Gbps

= 3.125 GB/s

Data center standard

40 Gbps

= 5 GB/s

High-speed backbone

100 Gbps

= 12.5 GB/s

100G Ethernet

Gbps to GB/s Reference Table

Speed (Gbps)	GB/s	MB/s	Technology
0.5 Gbps	0.0625 GB/s	62.5 MB/s	DOCSIS 3.0 cable
1 Gbps	0.125 GB/s	125 MB/s	Gigabit Ethernet
5 Gbps	0.625 GB/s	625 MB/s	USB 3.0 / WiFi 6
10 Gbps	1.25 GB/s	1,250 MB/s	10GbE / USB 3.1
16 Gbps	2 GB/s	2,000 MB/s	Fibre Channel
25 Gbps	3.125 GB/s	3,125 MB/s	25GbE SFP28
32 Gbps	4 GB/s	4,000 MB/s	PCIe 4.0 x8
40 Gbps	5 GB/s	5,000 MB/s	40GbE QSFP+
56 Gbps	7 GB/s	7,000 MB/s	InfiniBand FDR
100 Gbps	12.5 GB/s	12,500 MB/s	100GbE QSFP28
200 Gbps	25 GB/s	25,000 MB/s	InfiniBand HDR
400 Gbps	50 GB/s	50,000 MB/s	400GbE QSFP-DD

Understanding Gigabit Networks

Network Technologies

Common Gbps implementations:

1 Gbps: Home/office standard
10 Gbps: Enterprise backbone
25/40 Gbps: Data center ToR
100 Gbps: Core networking
400 Gbps: Internet exchange
800 Gbps: Next generation

Real vs Theoretical Speed

Actual throughput factors:

Protocol overhead	~5-10%
TCP/IP headers	~3-5%
Ethernet framing	~2-3%
Retransmissions	Variable
Typical efficiency	~85-95%

Expect 10-15% less than theoretical maximum

Fiber Optic Standards

Distance capabilities:

SR (Short Range): 100-400m
LR (Long Range): 10km
ER (Extended Range): 40km
ZR (Zero Dispersion): 80km+

Connector types: LC, SC, MPO/MTP

Wavelengths: 850nm (MM), 1310nm, 1550nm (SM)

Data Center Applications

Typical bandwidth usage:

VM migration	1-10 Gbps
Storage replication	10-40 Gbps
Database cluster	25-100 Gbps
AI/ML training	100-400 Gbps
CDN edge node	100+ Gbps

Cost Considerations

Approximate pricing (2024):

1 Gbps: $50-100/month
10 Gbps: $500-1,500/month
100 Gbps: $5,000-15,000/month
Transit: $0.20-2.00 per Mbps
Peering: Port costs only

Prices vary significantly by location and provider

Frequently Asked Questions

Why divide by 8 to convert Gbps to GB/s?

Network speeds are measured in bits per second (Gbps), while file sizes use bytes (GB). Since 1 byte = 8 bits, you divide the bit rate by 8 to get the byte rate. For example, 10 Gbps ÷ 8 = 1.25 GB/s theoretical maximum transfer rate.

Why is my actual transfer speed lower than calculated?

Several factors reduce real-world speeds: protocol overhead (TCP/IP headers), error correction, network congestion, disk I/O limitations, CPU processing, and distance/latency. Typically expect 70-85% of theoretical maximum in good conditions.

What's the difference between Gbps and GBps?

Gbps (with lowercase 'b') means gigabits per second, while GBps (with uppercase 'B') means gigabytes per second. The difference is 8x: 1 GBps = 8 Gbps. Network equipment typically uses Gbps, while storage systems often use GBps.

Can I actually achieve 100 Gbps speeds?

Yes, but it requires: compatible network cards (100GbE NICs), appropriate cabling (fiber optics), capable switches/routers, optimized systems (CPU, memory, storage), and proper configuration. Most importantly, both endpoints need matching capabilities.

How much bandwidth do I need for my application?

Depends on use case: 4K streaming needs 25 Mbps, video conferencing 5-25 Mbps, large file transfers benefit from 1+ Gbps, database replication often needs 10+ Gbps, and data center interconnects typically require 100+ Gbps for optimal performance.