What Is Jitter?

Jitter is the variation in your ping over time, measured in milliseconds (ms). Where ping tells you the average delay on your connection, jitter tells you how consistent that delay is. A low, steady ping with low jitter feels smooth; a connection whose ping jumps around has high jitter and feels choppy, even when the average looks fine. This guide explains what jitter means, what a good jitter is, how it differs from ping, why high jitter ruins gaming and video calls, what causes it, and how to reduce it. You can measure your own jitter in seconds with the free SpeedSnap speed test.

What does jitter mean?

Every time you send data, each packet takes a certain amount of time to reach a server and come back. Ping measures that round trip. Jitter is how much that round-trip time changes from one packet to the next. If your ping is 25 ms, then 24 ms, then 27 ms, then 25 ms, jitter is low because the delay is steady. If it bounces between 20 ms and 90 ms, jitter is high because the timing is erratic.

Technically, jitter is the average variation between consecutive packet delays. A speed test reports it as a single number in ms alongside your ping. The lower the jitter, the more predictable your connection — and predictability is exactly what real-time apps depend on.

Jitter vs ping: what is the difference?

Ping and jitter measure two different things, and confusing them is common:

• Ping (latency) is the time a single packet takes for the round trip to a server, reported in ms. It is the average delay. Learn more in our what is ping guide.
• Jitter is how much that delay varies between packets. It is the consistency of the delay, not the delay itself.

The key insight: you can have a low average ping but still have high jitter. Your average might read a healthy 25 ms while individual packets swing wildly. For streaming a movie this barely matters, because the player buffers ahead. For a live voice call or a fast-paced game, where packets must arrive in a steady rhythm, high jitter is far more damaging than a slightly higher but stable ping.

What is a good jitter?

Here is how to read the jitter number from your speed test. These ranges apply to a typical test against a nearby server:

As a quick rule: aim for under 10 ms if you can, treat anything under 30 ms as acceptable, and treat over 50 ms as a problem worth fixing. Jitter is best judged together with ping — a 15 ms ping with 4 ms jitter is excellent, while a 15 ms ping with 60 ms jitter will feel unreliable.

Why high jitter ruins gaming and video calls

Real-time applications are built around the assumption that packets arrive at a steady, predictable pace. When jitter is high, that assumption breaks — and it breaks even if your average ping looks low.

• Video calls — voice and video are split into a stream of small packets. When they arrive bunched together or late, you hear robotic audio, dropped words and frozen frames. Apps use a "jitter buffer" to smooth this out, but a large buffer adds delay and a small one drops packets, so high jitter loses either way.
• Online gaming — games send rapid position updates many times per second. Uneven packet timing causes rubber-banding, teleporting opponents and delayed hit registration. A player with 80 ms ping but tiny jitter often feels smoother than one with 30 ms ping and big jitter spikes.
• Live streaming and screen sharing — inconsistent delivery forces players to stall and rebuffer, producing the freeze-then-skip effect.

In short, for anything live, consistency beats a low average. High jitter is sometimes accompanied by dropped packets too; see our what is packet loss guide for how those two problems overlap.

What causes high jitter?

Several factors make packet timing erratic:

• Wi-Fi — wireless is the most common cause. Distance from the router, walls, and interference from neighboring networks or devices make packet timing inconsistent.
• Network congestion — during peak hours, traffic on your line or your ISP's network queues up unevenly, so some packets wait longer than others.
• Bufferbloat — when a heavy download or upload saturates your link, oversized buffers in your router hold packets back in bursts, spiking both latency and jitter. Our what is bufferbloat guide explains this in detail.
• Too many devices — phones, TVs and smart-home gear all competing for the connection create irregular bursts of traffic.
• Old or overloaded hardware — an aging router or modem struggles to process packets at a steady rate.

How to reduce jitter

1. Use a wired Ethernet connection instead of Wi-Fi — this is usually the single biggest fix, since it removes wireless interference entirely.
2. Pause downloads and close bandwidth-heavy apps while gaming or on a call, so your link is not saturated.
3. Reduce active devices competing for the connection, or schedule large updates for off-hours.
4. Enable QoS or Smart Queue Management (SQM) on your router to tame bufferbloat and prioritize real-time traffic.
5. Restart your router and keep its firmware up to date; replace very old hardware.
6. Test before and after each change with a speed test to confirm what actually lowered your jitter.

If jitter stays high after all of this — especially on a wired connection to a nearby server — the problem may be on your ISP's network or your line, and it is worth contacting them with your test results.

Measure your jitter now

The fastest way to know your jitter is to test it. SpeedSnap measures your jitter, ping, download and upload in about 30 seconds, with no app or sign-up. Run a free speed test, then read what is ping to understand latency, what is packet loss for dropped data, and what is bufferbloat for the congestion problem behind many jitter spikes.

Frequently Asked Questions

What is jitter?

Jitter is the variation in your ping (latency) over time, measured in milliseconds (ms). Instead of measuring how long a single packet takes, jitter measures how inconsistent that delay is from one packet to the next. Low, steady jitter means a stable connection; high jitter means packets arrive unevenly, which causes stutter in video calls and games.

What is a good jitter?

Under 10 ms of jitter is great and barely noticeable. Up to about 30 ms is generally okay for browsing, streaming and most calls. Above 50 ms is bad and will cause audible stutter in calls and lag spikes in games. For competitive gaming and clear video calls, aim to keep jitter as low and steady as possible.

What is the difference between jitter and ping?

Ping (latency) is the time a single packet takes to make the round trip to a server, while jitter is how much that time varies between packets. Ping is the average delay; jitter is the consistency of that delay. You can have a low average ping but still have high jitter if individual packets arrive at uneven intervals.

Why does high jitter ruin gaming and video calls even with low ping?

Real-time apps expect packets to arrive at a steady rhythm. When jitter is high, packets arrive bunched up or late even if the average ping is low, so audio breaks up, video freezes and games rubber-band or show delayed hit registration. A consistent connection matters more than a low average for live communication.

What causes high jitter?

Common causes of high jitter include Wi-Fi interference and weak signal, network congestion during peak hours, bufferbloat from saturated upload or download, too many devices sharing the connection, and aging or overloaded router hardware. Wireless connections and shared networks are the most frequent culprits.

How do I reduce jitter?

Reduce jitter by switching from Wi-Fi to a wired Ethernet connection, closing bandwidth-heavy apps and pausing downloads, limiting the number of active devices, restarting and updating your router, and enabling QoS or Smart Queue Management to tackle bufferbloat. Test before and after each change to confirm what helped.