Hub · 33 guides

Speed Test Guide

Speed tests give you five numbers. Most people only look at one. This hub walks through what each metric actually means, what affects it, and what to do when results look wrong.

Start from the beginning Explain my results

Key thresholds at a glance

25
Mbps min for 4K streaming
20
ms max ping for competitive gaming
5
ms max jitter for smooth calls
1
% packet loss that breaks real-time apps
3
Mbps min upload for HD video calls
50
% speed drop that warrants an ISP call
200
Mbps recommended for 4+ person households

Start here

How a Speed Test Works
What the test actually does - choosing a server, sending data packets, measuring transfer rates. Why the number you see is a snapshot, not a fixed property.
Read guide →
How to Read Your Results
What each of the five numbers means, what counts as good, and what combinations of results tell you about your specific connection problem.
Read guide →
How to Get Accurate Results
Use Ethernet. Close background apps. Test at different times. Small setup mistakes can make a 200 Mbps connection look like 40 Mbps.
Read guide →
10 Common Testing Mistakes
Testing over Wi-Fi, running only one test, confusing Mbps with MB/s. The mistakes that make results meaningless - and how to avoid every one of them.
Read guide →
Why Results Change Each Time
ISP congestion, router load, server selection, time of day. Your connection isn't a fixed pipe - it's a road that gets busier at rush hour.
Read guide →
Ookla vs Fast.com - Which to Trust?
Why they give different numbers, which to use for gaming vs streaming vs detecting ISP throttling, and how Cloudflare Speed Test fits in.
Read guide →

The five metrics

Download Speed
The big number most people focus on. Data flowing from the internet to your device. Measured in Mbps. Covers streaming, browsing, and updates.
Read guide →
Upload Speed
Often 10x slower than download on home plans. Matters more than most people realise - every video call, cloud backup, and file share depends on it.
Read guide →
Ping and Latency
How long a signal takes to make the round trip. Under 20ms feels instant. Over 100ms and online gaming becomes frustrating. Doesn't show up in Mbps at all.
Read guide →
Jitter
Variation in latency. A 30ms average with ±2ms variation is smooth. The same average with ±20ms variation causes choppy calls and dropped audio.
Read guide →
Packet Loss
Data that never arrives. Zero is normal. Anything above 1% in real-time apps - gaming, calls - starts causing noticeable problems no bandwidth can fix.
Read guide →
Mbps Explained
Why your 100 Mbps plan only shows ~12 MB/s in your download manager. The bits vs bytes confusion that trips up almost everyone reading a speed test.
Read guide →

Understanding the numbers

Speed vs Bandwidth
Speed and bandwidth are not the same thing. One is a rate, one is a capacity. Understanding the difference explains why your connection feels slower with more devices.
Read guide →
Is 100 Mbps Fast Enough?
For most households of 1-3 people, yes. For 4+ people with simultaneous 4K streams and video calls, probably not. Here's how to calculate your real needs.
Read guide →
Fast Test But Internet Feels Slow
Bufferbloat, high latency, Wi-Fi interference, slow DNS, peak congestion, old device. Seven reasons your speed test looks great but browsing still drags.
Read guide →

Your connection

Wi-Fi vs Ethernet
A cable almost always gives you lower ping, better jitter, and more consistent speeds. Find out when the difference actually matters and when Wi-Fi is fine.
Read guide →
Routers and Modems
Old hardware limits new plans. How to tell if your router is the bottleneck, the difference between renting and buying, and when to replace each device.
Read guide →
Router Placement
Where you put your router matters as much as which router you buy. Central position, elevation, what kills signal through walls, and how to fix dead zones.
Read guide →
Fiber, Cable, and DSL
How your connection type sets a ceiling on speed and upload. Why fiber consistently outperforms cable on upload speed, ping, and reliability.
Read guide →
Satellite Internet Speeds
Starlink vs traditional geostationary services. Why legacy satellite has 600ms+ latency, how LEO orbits changed that, and how to test a satellite connection accurately.
Read guide →
Mobile and 5G Speeds
5G sub-6, mmWave, and 4G LTE - what the differences mean for real-world speed. Why five bars on your phone doesn't mean fast internet.
Read guide →
DNS and Internet Speed
The DNS lookup happens before every page load. Slow DNS adds 100-500ms of invisible delay. How Google DNS and Cloudflare compare - and how to switch.
Read guide →
Your ISP and Internet Plan
What "up to" speeds actually mean, how to read the fine print in your plan, how to document slow speeds for a dispute, and when to escalate a complaint.
Read guide →
Wi-Fi Standards: Wi-Fi 4, 5, 6, 6E and 7
Why a Wi-Fi 4 router caps your speed test at 150 Mbps even on a gigabit plan. What changed with each generation and which standard you actually need.
Read guide →
Mesh Wi-Fi and Speed Tests
Why satellite mesh nodes score lower than your router on speed tests, wired vs wireless backhaul performance, and how to identify if the mesh is your bottleneck.
Read guide →
IPv6 and Internet Speed
Whether IPv6 is faster than IPv4, how NAT overhead affects latency, how to check if your connection uses IPv6, and what it means for your speed test results.
Read guide →
Business Internet Speed
How business connections differ from residential - symmetrical upload, SLA terms, VoIP jitter requirements, and how to test and document speeds for ISP disputes.
Read guide →

Troubleshoot

Slow Internet Checklist
Eight steps to diagnose and fix slow internet yourself before calling your ISP. Most problems can be solved in under 20 minutes at home.
Read guide →
Peak Hours and Congestion
Why your speed drops every evening. Shared infrastructure, neighbourhood contention, how much it actually costs you, and what you can do about it.
Read guide →
Bufferbloat
The hidden problem that makes gaming lag while someone else downloads. How a full buffer creates latency spikes even on a fast connection - and how to fix it.
Read guide →
VPNs and Speed Tests
VPNs almost always reduce speed. By how much depends on server, protocol, and your base connection. How to measure the impact and choose the fastest protocol.
Read guide →

Speed for specific uses

Gaming
Gaming doesn't need fast internet - it needs low, stable ping. The exact numbers by game type, plus how to cut latency without changing your plan.
Read guide →
Streaming Video
Netflix 4K uses 15-25 Mbps. YouTube 4K uses more. Exactly how much each streaming service needs and how simultaneous streams stack up.
Read guide →
Video Calls
Zoom, Teams, Google Meet each have published minimums. What they don't tell you: upload speed and jitter matter far more than your download number.
Read guide →
Working From Home
Stacking calls, VPNs, cloud sync, and shared household usage. How to calculate your real WFH bandwidth needs and prioritise the right traffic.
Read guide →
Uploading Files and Content
Cloud backups, YouTube uploads, Twitch streaming, large file transfers. How to calculate upload time and why cable plans make this painful.
Read guide →
Smart Home Devices
Security cameras are the hidden bandwidth hogs. How much each device type actually uses, how many your plan can handle, and whether you need a dedicated IoT network.
Read guide →
speedtest.how is an independent educational site. We do not run speed tests. We are not affiliated with Ookla® or Speedtest® by Ookla, or any ISP. Numbers cited are general guidelines - Actual requirements vary by device, service, and network conditions.