BT Speed Test

Measure the real-world performance of your BT Broadband connection with this professional speed test tool. BT is the United Kingdom's largest internet service provider, serving over 10 million broadband households through its Openreach network infrastructure. BT offers two distinct broadband technologies: Fibre 1/2 (FTTC) using copper for the last leg from the green street cabinet, and Full Fibre (FTTP) with a direct fibre optic connection to your home.

Whether you are on Fibre 1 (36 Mbps), Fibre 2 (67 Mbps), or the premium Full Fibre 900, this test will verify whether your connection meets BT's Stay Fast Guarantee — the personalised minimum speed BT committed to when you signed up.

How to Interpret Your BT Speed Test Results

Your speed test measures three key performance metrics that define your broadband experience:

Download speed – How fast data arrives at your device. On BT Fibre 1/2 (FTTC), download speed is distance-dependent — it degrades the further you live from the green street cabinet. On Full Fibre (FTTP), download speed should closely match your plan speed when testing over Ethernet, regardless of distance.

Upload speed – How fast you can send data. BT plans are asymmetric. Fibre 2 offers approximately 9-10 Mbps upload, while Full Fibre 900 provides around 110 Mbps upload. If you work from home and rely on video conferencing, cloud backups, or file sharing, upload speed is often the more important metric.

Latency (ping) – Round-trip delay in milliseconds. BT Full Fibre typically delivers 5–12ms to UK servers, while FTTC delivers 10–20ms. If you see unusually high ping (50ms+), check whether your Smart Hub light is purple — this means you are running on the EE 4G backup (Hybrid Connect), not your fibre line.

BT Broadband: Expected Performance by Plan

BT Fibre plans (FTTC – copper last mile)

BT Fibre 1 and Fibre 2 use Openreach VDSL2 technology. Fibre runs to the green street cabinet, then copper telephone wire carries the signal to your home. Speed depends on the distance between your home and the cabinet.

BT Plan Max Download Max Upload Typical Real-World
Fibre 1 36 Mbps 9.5 Mbps 24–36 Mbps (distance dependent)
Fibre 2 67 Mbps 18 Mbps 40–67 Mbps (distance dependent)

Important: If you live more than 800 metres from the cabinet, your line physically cannot deliver full FTTC speed. This is a copper limitation, not a BT fault. Check your DSL sync speed in the Smart Hub admin panel at 192.168.1.254 → Advanced Settings → DSL Connection.

BT Full Fibre plans (FTTP – direct fibre)

Full Fibre uses Openreach FTTP infrastructure. Fibre optic cable runs from the exchange directly to an ONT (Optical Network Terminal) inside your home. Speeds are consistent and not affected by distance.

BT Full Fibre Plan Download Upload Expected Wired Speed
Full Fibre 100 100 Mbps 15 Mbps 92–100 Mbps
Full Fibre 500 500 Mbps 73 Mbps 460–500 Mbps
Full Fibre 900 900 Mbps 110 Mbps 800–900 Mbps

If your wired test on Full Fibre caps at exactly 94 Mbps, you are almost certainly using an old Cat5 Ethernet cable or a device with a 100 Mbps Fast Ethernet port. Replace with Cat5e or Cat6 cable and ensure your device has a Gigabit Ethernet adapter.

BT Smart Hub 2: Hardware Guide

The Smart Hub 2 is BT's current router, featuring Wi-Fi 5 (802.11ac) with dual-band support and a built-in 4G backup (on Halo plans). Understanding its indicator lights is essential for diagnosing issues:

Solid Blue: Connected and working normally. All services are active.

Purple: Your broadband is down and the Hub has switched to EE 4G backup (Hybrid Connect). Speeds will be significantly slower (5–30 Mbps typical). If purple persists more than 24 hours, contact BT.

Solid Orange: The Hub is connected to Wi-Fi but has no internet. Check the master socket and DSL/fibre cable.

Flashing Orange: The Hub is trying to establish a broadband connection. Wait up to 5 minutes.

Solid Red: Hardware fault. Try factory reset. If persistent, request a replacement.

Dim/Off: The Hub is in power-saving mode or has been manually switched off.

BT Complete Wi-Fi Discs

For larger homes, BT offers Complete Wi-Fi Discs (also called WiFi Discs) that create a mesh network with your Smart Hub 2:

  • Solid Blue light on disc: Good connection to the Hub. Optimal performance.
  • Orange light on disc: Too far from the Hub or another disc. Move it closer for better connection.
  • No light: The disc is in power-saving mode or not powered on.

Each disc uses Wi-Fi 6 and can deliver 300–500 Mbps wirelessly. For optimal placement, position discs halfway between the Hub and the rooms with poor coverage.

Common Causes of Slow BT Speeds

Before calling BT support, investigate these common UK-specific issues:

The "Purple Light" trap: If you have BT Halo (Hybrid Connect) and your Smart Hub is glowing purple, you are on the EE 4G backup. This provides basic internet (5–30 Mbps) but is dramatically slower than your fibre. Wait for the fibre to recover, or contact BT if it persists beyond 24 hours.

Master Socket (NTE5): On FTTC plans, always connect your Hub directly to the master socket — the one with the horizontal split faceplate. Extension sockets can reduce speed by 30–50%. For a definitive test, unscrew the lower faceplate to reveal the hidden "test socket" and plug in there.

Microfilters (FTTC only): Every telephone socket in your home that has a device plugged in must have a microfilter. A missing filter introduces interference that can severely degrade broadband speed.

Hub placement: In UK terraced houses and Victorian properties, thick party walls and multiple floors can block Wi-Fi signals. Place the Hub centrally and elevated. Consider BT Complete Wi-Fi Discs for multi-room coverage.

DLM (Dynamic Line Management): After a new connection or line fault, Openreach's DLM system may reduce your sync speed or add interleaving to stabilise the line. This can take up to 10 days to settle to your line's optimal speed. Avoid restarting the Hub frequently during this period.

BT Smart Hub 2 Login – Default IP & Password

Access your BT Smart Hub 2 admin panel to change Wi-Fi settings, check DSL sync speed, manage connected devices, or configure advanced settings like port forwarding.

BT Smart Hub Login Details Information
Router Login IP Address 192.168.1.254 – Default gateway for all BT Hubs
Admin Password Found on the pull-out card on the back of the Smart Hub 2
Router Models Smart Hub 2 (current), Smart Hub Plus, Home Hub 5/6 (legacy)
Management App My BT App (iOS and Android)
Alternative Access bthub.home (hostname alias)

Steps to Login

  1. Connect your device to BT Wi-Fi or via Ethernet cable to the Hub's GigE LAN port
  2. Open a web browser (Chrome, Firefox, Edge)
  3. Type 192.168.1.254 or bthub.home in the address bar
  4. Enter the admin password from the pull-out card on the back of the Hub
  5. Navigate to Advanced Settings for DSL stats, Wi-Fi channels, or connected devices

Troubleshooting Login Issues

  • Page won't load? Make sure you are connected to the BT network. Try bthub.home if the IP address does not work.
  • Lost the password card? Factory reset the Hub by pressing the recessed reset button on the back for 20 seconds. The original password on the card will be restored.
  • Prefer the app? Download the My BT app for basic router management, speed tests, and troubleshooting without using the admin panel.

BT Stay Fast Guarantee Explained

BT provides a Stay Fast Guarantee that is personalised to your specific address and line quality. This is the minimum wired speed BT commits to delivering. Understanding and using this guarantee is important:

  • Where to find it: Your Welcome email, the My BT app, or your order confirmation
  • How it works: If your wired speed consistently falls below your guaranteed figure, contact BT. If they cannot resolve it within 30 days, you can exit your contract without an early termination fee.
  • Important caveat: The guarantee applies to wired tests only. Wi-Fi speeds are not covered. You must test with an Ethernet cable connected directly to the Hub.
  • Ofcom regulation: Under Ofcom's broadband speeds code of practice, BT must provide an accurate speed estimate before you sign up. If actual speeds are significantly lower, you have the right to exit.

Wired vs Wi-Fi Testing on BT

Wi-Fi test results on BT are typically 30–50% lower than wired results. This is especially true in UK property types:

Terrace houses: Thin party walls allow interference from neighbours' routers on both sides, degrading your 2.4 GHz and 5 GHz signals.

Victorian / Edwardian properties: Thick solid brick walls and multiple floors block Wi-Fi significantly. These homes benefit most from BT Complete Wi-Fi Discs.

Blocks of flats: High density of competing Wi-Fi networks reduces throughput on all bands. Use the 5 GHz band and consider changing the Wi-Fi channel in the Hub admin panel.

For a true measurement of your BT service (and for Stay Fast Guarantee purposes), connect a Cat5e or Cat6 Ethernet cable directly from the Smart Hub's GigE LAN port to your computer. Turn off Wi-Fi on the computer during the test.

When to Contact BT Support

Contact BT if you experience any of these persistent issues:

  • Wired speed consistently below your Stay Fast Guarantee figure
  • Smart Hub light is purple for more than 24 hours (fibre line down, stuck on 4G)
  • Smart Hub light is solid orange (no internet despite being connected)
  • Frequent disconnections (multiple times per day)
  • DSL sync speed has dropped significantly in the admin panel (FTTC)
  • Wi-Fi Discs showing persistent orange light despite repositioning

BT Support: 0800 800 150 (or dial 150 from any BT landline)

Online: bt.com/help — live chat, automated line test, and fault reporting

My BT App: Run a line test, check for outages in your area, and contact support directly

BT Speed Test FAQs

What is BT's Stay Fast Guarantee? It's a personalised minimum speed commitment for your address. If wired speed consistently falls below this level and BT cannot resolve it within 30 days, you can exit your contract penalty-free. Find your guaranteed speed in the My BT app or your Welcome email.

How do I log into my BT Smart Hub 2? Open a browser and go to 192.168.1.254 or type "bthub.home" in the address bar. Enter the admin password from the pull-out card on the back of the Hub.

What does a purple light on my Smart Hub mean? Purple means your fibre broadband is down and the Hub has switched to the EE 4G mobile backup (BT Halo / Hybrid Connect). Speeds will drop to 5–30 Mbps. If it persists over 24 hours, your fibre line needs repair — contact BT at 0800 800 150.

What is the difference between BT Fibre and Full Fibre? BT Fibre (Fibre 1, Fibre 2) uses FTTC — fibre to the cabinet, then copper to your home. Maximum 67 Mbps, distance-dependent. Full Fibre uses FTTP — fibre directly to your home. Up to 900 Mbps, consistent regardless of distance.

Why does my Full Fibre 900 test show only 94 Mbps? You are bottlenecked by either a Cat5 Ethernet cable (100 Mbps limit) or a device with a Fast Ethernet port. Replace the cable with Cat5e or Cat6 and check that your device has a Gigabit Ethernet adapter.

Can I use my own router with BT? Yes. For FTTC, use a VDSL2-compatible router (TP-Link Archer VR2100, ASUS DSL-AC68U). For FTTP, connect any router to the Openreach ONT via Ethernet. Your BT username is typically [email protected].

How do BT Complete Wi-Fi Discs work? They create a mesh network with your Smart Hub 2. Place discs halfway between the Hub and rooms with poor coverage. Solid blue light = good connection. Orange light = too far, move closer. Each disc supports Wi-Fi 6.

BT Competitors & Alternatives in the UK

Compare your BT results with other UK broadband providers: