How to Run a Proper Speed Test — Most People Do It Wrong
You’ve done it. Opened a browser, typed “speed test” into Google, clicked the first result, and watched the numbers spin for a few seconds. Then you looked at the result, sighed, and blamed your internet provider.
I’ve done it too. And most of the time, I was blaming the wrong thing.
Here’s the problem: the number you see on a speed test website depends on dozens of things — what device you’re using, where you’re standing, what time it is, what else is happening on your network, and even which website you used to run the test.
Most people run speed tests wrong. The result they get tells them very little. This guide fixes that.
The three mistakes nearly everyone makes
Mistake 1: Testing on Wi-Fi
Your phone or laptop is on Wi-Fi. You run a speed test. The result says 50 Mbps. You think “I pay for 200 Mbps! My internet is broken!”
But that 50 Mbps isn’t your internet speed. It’s your Wi-Fi speed. The signal between your device and your router might be weak. The router might be in a bad spot. There might be interference from your neighbour’s Wi-Fi or your microwave. That might be as fast as the Wi-Fi on your device can handle.
You just tested your Wi-Fi, not your internet. They’re different things.
Mistake 2: Testing once
You ran one test. Got one number. Made a decision based on it.
But internet speeds fluctuate. They change by the hour. They change based on what other people in your house are doing. One test is a snapshot, not the full picture.
Mistake 3: Testing at the wrong time
If you test at 10 AM on a Tuesday when everyone’s at work or school, you’ll get a great result. If you test at 8 PM on a Sunday when everyone’s streaming, gaming, and video-calling, you’ll get a terrible result.
Same internet. Same equipment. Completely different numbers. Neither one is “wrong” — they’re just telling you different things.
The right way to run a speed test
There’s a method. It takes about ten minutes. Do it once and you’ll understand your network better than most people ever will.
Step 1: The wired test
This is the most important step. It answers the question: “Is my internet actually as fast as I’m paying for?”
Plug a laptop into your router with an Ethernet cable. Not Wi-Fi. A physical cable. Run a speed test. Write down the result.
What this tells you: Your true internet speed — what’s actually coming into your house from your provider. Nothing else matters until this number is right.
If your wired speed test gives you 180 Mbps and you pay for 200 Mbps, that’s normal. You’ll never get exactly the plan speed — there’s always a small loss. Anything above 80% of your plan speed is fine.
If your wired test gives you 50 Mbps and you pay for 200 Mbps, something is wrong. Restart your modem and router, wait two minutes, and test again. Still low? Call your Internet Service Provider (ISP). AT&T, Verizon, whoever it is.
Step 2: The same-room Wi-Fi test
Unplug the cable. Connect your laptop to Wi-Fi. Stand in the same room as the router. Run the test again.
What this tells you: The maximum speed your Wi-Fi can deliver under ideal conditions. If this number is close to your wired number, your Wi-Fi setup is good. If it’s much lower, something is wrong with your router or its configuration.
Step 3: The dead-zone test
Take your laptop to the room where the Wi-Fi is worst. Run the test again.
What this tells you: Your Wi-Fi coverage problem. If the same-room test gave you 180 Mbps and the dead-zone test gives you 20 Mbps, the problem is distance and obstacles — not your internet, not your router brand. Just physics.
This is the most useful test of all. It tells you exactly where your problem is and how bad it is.
Step 4: Test for a week
I know this sounds like a lot. But here’s a simpler version: run one speed test at the same time every day for a week. Note the result. If every day looks roughly the same, your network is stable. If some days are great and others are terrible, the problem is probably your ISP, not your equipment.
What the numbers actually mean
| Wired test result | What it means |
|---|---|
| 80%+ of your plan speed | Your internet is fine. Problem is your Wi-Fi |
| 50-80% of your plan speed | Might be normal. Try restarting everything |
| Below 50% of your plan speed | Call your ISP. Something’s wrong on their end |
| Wi-Fi test result | What it means |
|---|---|
| Close to wired speed | Great Wi-Fi setup. You’re in good shape |
| Half your wired speed | Normal for Wi-Fi through a wall or two |
| Less than a quarter your wired speed | You’ve found your dead zone. Fix needed |
Which speed test website should you use?
There are dozens. Stick with one of these. They’re all free and they all work in a browser — no app needed.
- Speedtest.net (Ookla) — The most popular. Works well. Pick a server close to you for the most accurate result.
- Fast.com (Netflix) — Very simple. Just shows your speed. Netflix runs their own servers so this can sometimes show higher speeds than other tests.
- Cloudflare Speed Test — Privacy-focused. Also shows latency and jitter numbers that are useful if you do video calls or gaming.
Any of these is fine. The important thing is to use the same one every time so you’re comparing apples to apples.
When to call your ISP (and when not to)
Call your ISP when:
- Your wired speed test is consistently below 80% of your plan speed
- Your internet goes out during bad weather
- You see error lights on your modem (check your modem’s manual for what the lights mean)
- You’ve restarted everything twice and nothing changed
Don’t call your ISP when:
- Your Wi-Fi is slow but your wired test is fine — it’s your Wi-Fi, not your internet
- One device is slow but others are fine — it’s that device, not your network
- Your internet slows down at 8 PM every night — it’s congestion, call your ISP if you want, but the answer will be “that’s normal”
The quick guide
| If you… | Do this |
|---|---|
| Want to check your internet speed | Plug a laptop into the router with a cable. Run Speedtest.net |
| Want to check your Wi-Fi | Same room as the router, on Wi-Fi. Compare to the wired result |
| Want to find your dead zone | Take your laptop to the worst room. Run the test. Note the number |
| Think your internet is slow | Run the wired test first. 90% of “slow internet” is actually “slow Wi-Fi” |
| Want a baseline | Run one test a day at the same time for a week. Note the pattern |
What to do now
- Run a wired speed test right now. Write down the number
- Run the same test on Wi-Fi in the same room as your router. Write that down too
- Run it in your worst room. Compare all three
- Bookmark Fast.com or Speedtest.net for quick future checks
- If your wired speed is low, restart your modem and router, wait two minutes, test again
- If it’s still low after that, call your ISP. Have the number ready when you call
Read this next: The 5 Router Settings You Should Change Right Now — they take ten minutes and will keep you safe.
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