Ping vs Latency – What's the Difference?
Latency is the delay before data arrives. “Ping” is the most common way to measure it. In everyday use, including in speed tests and games, “your ping” simply means your round-trip latency in milliseconds (ms).
The precise definitions
- Latency is the time it takes for data to travel from one point to another. It is often measured as a round trip: from your device to a server and back again.
- Ping is a network tool that measures round-trip time by sending small “echo request” messages and timing the replies. The name was borrowed from the sound of sonar. In games and speed tests, “ping” has come to mean the round-trip latency number itself.
Browsers cannot send real ping messages, so web-based speed tests measure latency with very small web requests instead. SpeedCheckWeb times each request using your browser’s own network timestamps. This captures the network delay and leaves out most of the time the browser spends processing.
What causes latency?
- Distance. Signals in fibre-optic cable travel at roughly two-thirds of the speed of light. A round trip across a continent takes tens of milliseconds, and across an ocean even longer.
- The route. Data rarely travels in a straight line. It passes through many routers and between several networks, and each step adds a little delay.
- Your access technology. Fibre and cable usually add only a few milliseconds. Older DSL lines, mobile networks and especially satellite links add more.
- Wi-Fi. A weak or crowded Wi-Fi signal adds delay and makes it less consistent.
- Queues. When a link is busy, data waits in queues inside routers. This is the biggest cause of variable latency. See bufferbloat.
What is a good ping?
These are practical rules of thumb for latency to a nearby server:
| Latency | How it feels |
|---|---|
| Under 20 ms | Excellent. Ideal for competitive gaming. |
| 20–50 ms | Very good for gaming, calls and everything else. |
| 50–100 ms | Fine for most uses; fast-paced games may feel slightly delayed. |
| 100–200 ms | Noticeable in games; calls may feel slightly delayed. |
| Over 200 ms | Laggy for real-time use. |
For voice calls, the ITU’s G.114 recommendation advises keeping the one-way delay below about 150 ms for good conversation quality. That is roughly 300 ms for the round trip, which is the figure a speed test shows.
Why speed and latency are different
A connection can be fast but laggy, or slow but responsive. Speed (bandwidth) is how much data can flow per second. Latency is how long each piece takes to arrive. Think of a motorway: the number of lanes is the bandwidth, and the travel time from one end to the other is the latency.
Web browsing, gaming and video calls exchange lots of small messages back and forth, so they often depend more on latency than on raw speed. A 50 Mbps line with 15 ms latency can feel snappier for gaming than a 1 Gbps line with 80 ms.
Idle latency vs latency under load
SpeedCheckWeb reports latency in three situations:
- Idle latency: measured while nothing else is running in the test. This shows the best your connection can do.
- Latency during download and latency during upload: measured while the line is full. A large increase means your router or provider is queuing too much data, which causes lag whenever someone in your home is downloading or uploading.
Try our ping and bufferbloat test for a latency-focused check.
Why your game’s ping can differ from a speed test
Your game measures latency to its own servers, which may be in another city or country. A speed test measures latency to its test server. SpeedCheckWeb uses the nearest Cloudflare data centre, which is usually very close to you. If your speed-test latency is low but your game ping is high, the distance or the route to the game server is the likely cause.
In short: latency is the delay, and ping is how it is usually measured. Lower and steadier latency means a more responsive connection, especially for games and calls.
Sources
- RFC 792 – Internet Control Message Protocol (ICMP echo, used by the ping command)
- RFC 2681 – A Round-trip Delay Metric for IPPM
- ITU-T Recommendation G.114 – One-way transmission time
Figures from third parties can change; we review guides regularly. See our editorial policy.