How to test your Wi-Fi room by room
A speed test next to the router tells you about your plan. A test in every room tells you where your Wi-Fi gives out, and what will fix it.
Run the same test, on the same phone or laptop, in every room, and write down download, upload and ping. Compare each room with a wired result at the router. Rooms below about half the wired speed, or with ping over 50 ms, are your weak spots. Use our speed test or any test that shows all three numbers.
What you need
- One phone or laptop, used for every test, so results are comparable.
- A speed test that shows download, upload and ping.
- A wired result at the router, as your baseline: a laptop plugged in with Ethernet.
- About 15 minutes, at a time when nobody else is streaming or downloading.
Step by step
- Run a wired test at the router three times. Note the middle result: this is your baseline.
- Stand next to the router with the test device on Wi-Fi and run the test. This shows your Wi-Fi at its best.
- Walk to each room, standing where you actually use the internet (the couch, the desk, the bed), and run the test once.
- Note the floor, distance and walls between the room and the router.
- Repeat the slowest rooms in the evening, when the network is busiest.
Don't forget the edges
Test the places people actually use, even if they aren't rooms: the patio, the garage, a home office over the garage, a backyard workshop. Smart doorbells and cameras at the edges of the home often have weak Wi-Fi, so a test at the front door tells you whether they'll keep up.
Record your results
| Room | Download | Upload | Ping | Notes |
|---|---|---|---|---|
| Router (wired) | Baseline | |||
| Router (Wi-Fi) | ||||
| Living room | ||||
| Office | ||||
| Bedroom | ||||
| Basement / upstairs |
Copy this table into a notes app, or print the page.
How to read the results
| Result vs. wired baseline | What it means |
|---|---|
| 80% or more | Excellent Wi-Fi |
| 50% to 80% | Normal for Wi-Fi; fine for most uses |
| 25% to 50% | Weak: expect slow downloads and buffering on 4K |
| Under 25%, or ping over 50 ms | Dead zone |
If even the router-room Wi-Fi result is well below wired, the router itself or the test device is the limit, not the distance.
Why some rooms are slower
Wi-Fi weakens with distance and with everything it passes through. Drywall and wood cost a little; brick, concrete, stone, tile over cement board and metal cost a lot. Mirrors, fish tanks and large appliances reflect or absorb signal, and floors are usually worse than walls because of ductwork and wiring. A room two walls away on the same floor can test better than the room directly above the router.
2.4, 5 and 6 GHz
Most routers broadcast on more than one band. The 2.4 GHz band reaches furthest and gets through walls best, but it's slower and more crowded. The 5 GHz band is much faster at short and medium range. The 6 GHz band, on Wi-Fi 6E and Wi-Fi 7 routers, is the fastest and least crowded but has the shortest range. If a far room tests badly, check which band your device is on; a device clinging to 5 GHz at the edge of range can do worse than it would on 2.4 GHz.
When the numbers look fine but it still feels slow
A room can show a decent download result and still struggle with video calls or games. Check ping and jitter in the same test: ping that rises well above what you see near the router, or results that jump around from run to run, point to a weak or crowded signal. A wired connection, if you can run one, removes the problem; see Ethernet vs. Wi-Fi.
What to do with weak rooms
- Move the router. Central, high and in the open: not in a cabinet, a basement corner or behind a TV.
- Switch bands. 5 GHz (and 6 GHz on Wi-Fi 6E and 7) is faster near the router; 2.4 GHz reaches further at lower speed.
- One weak room: a Wi-Fi extender placed halfway between the router and the room.
- Several weak rooms or two floors: a mesh Wi-Fi system.
- A desk or TV that never moves: run an Ethernet cable or use powerline or MoCA adapters. See Ethernet vs. Wi-Fi.
- Old router: if it's Wi-Fi 5 or older, a new one may fix everything. See the best Wi-Fi routers.
Not sure which fix? See mesh vs. extender and how to boost your Wi-Fi.
Where to put the router
Put it near the middle of the home, raised off the floor, and out in the open. Cabinets, closets, the space behind a TV and basement corners all cut range. If the internet line comes in at one end of the house, an Ethernet cable to a central spot often fixes more than a new router would. In a two-story home, a router on the upper floor of the ground level, such as on top of a bookcase, usually covers both floors better than one on the floor.
Placing mesh points and extenders
Mesh points and extenders need a strong signal from the router to pass along. Place each one about halfway between the router and the weak area, where your phone still shows a good connection, not in the dead zone itself. After placing it, run the room tests again. If a room improved but is still slow, move the point closer to it. See mesh vs. extender and how to set up mesh Wi-Fi.
Test again after the fix
Run the same test in the same spots after moving the router or adding mesh. If a room improved but is still under half the wired speed, move the mesh point or extender closer to it.
Questions
What is a good Wi-Fi speed in each room?
Around half of your wired speed or better, with ping under 50 ms, is good for streaming and video calls. Rooms near the router often reach 80% of wired.
Why is my Wi-Fi slow in one room?
Distance, walls, floors and interference reduce Wi-Fi. Brick, concrete, mirrors and large appliances block it most.
Is there an app that maps Wi-Fi coverage?
Many mesh router apps and Wi-Fi analyzer apps show signal strength by room. A speed test in each room shows what you actually get.
Should I test 2.4 GHz and 5 GHz separately?
If your router lets you pick, yes. 5 GHz is usually faster near the router; 2.4 GHz may do better in far rooms.
How do I find Wi-Fi dead zones?
Run the same speed test in every room on the same device, and compare each result with a wired test at the router. Rooms below about a quarter of the wired speed are dead zones.
Where should a mesh point go?
About halfway between the router and the weak area, where the signal is still strong. Not in the dead zone itself.
Does the router need to be on the same floor?
No, but central and raised placement matters more than floor. In two-story homes, a high spot on the ground floor often covers both.