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I Pay for 1 Gig Internet – Why Am I Only Getting 100 Mbps

January 23, 2026
This is one of the most common questions ISPs and IT teams hear — and in most cases, nothing is actually broken.

Your internet speed depends just as much on how you’re connected as what you’re paying for.

Internet Speed vs Real-World Speed

When an ISP advertises 1 Gbps, that’s:

  • The maximum speed to your modem
  • Under ideal conditions
  • On a compatible connection

That speed still has to travel through:

  • Your router
  • Your cables
  • Your Wi-Fi or Ethernet adapter
  • Your device hardware

Every step matters.

Wired Connections: Not All Ethernet Is Equal

Connection Type            Typical Max Speed

Fast Ethernet (100 Mbps)       ~95 Mbps

Gigabit Ethernet (1 Gbps)       ~940 Mbps

2.5 Gb Ethernet                       ~2.3 Gbps

Common causes of “stuck at 100 Mbps”:

  • Older Ethernet cables (Cat5 instead of Cat5e/Cat6)
  • Older switches or routers
  • Network cards limited to Fast Ethernet
  • Auto-negotiation issues

Even one outdated component can cap your speed.

Wi-Fi Speeds: Why They Vary So Much

Wi-Fi speeds are shared, variable, and affected by distance.

Typical Real-World Wi-Fi Speeds

  • Wi-Fi 4 (802.11n): 50–150 Mbps
  • Wi-Fi 5 (802.11ac): 200–600 Mbps
  • Wi-Fi 6 (802.11ax): 400–900+ Mbps (ideal conditions)

These are best-case scenarios, not guarantees.

Distance and Signal Strength Matter

The further you are from the access point:

  • The lower your speed
  • The higher your latency
  • The more retries your device needs

Walls, floors, appliances, and neighboring networks all reduce performance.

2.4 GHz vs 5 GHz Wi-Fi

Band             Pros                      Cons

2.4 GHz         Longer range        Slower, more interference

5 GHz            Faster speeds        Shorter range

Many users unknowingly connect to 2.4 GHz and expect gigabit-level speeds — which just isn’t realistic.

Shared Bandwidth Is a Thing

Your internet connection is shared between:

  • Streaming devices
  • Phones
  • Smart TVs
  • Game consoles
  • Cloud backups

Even if your speed test looks good, real-time usage can lower available bandwidth.

When You Should Worry

Lower speeds may indicate a problem if:

  • You’re wired with gigabit hardware and still capped at ~100 Mbps
  • Speeds suddenly drop across all devices
  • You see frequent disconnects or packet loss

That’s when troubleshooting makes sense.

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