Measure real-time network jitter, latency, and packet loss — the metrics that actually determine if your internet is good enough for gaming, video calls, and VoIP.
Network jitter is the variation in the time it takes for data packets to travel from one point to another. While latency (ping) measures the average round-trip time, jitter measures how inconsistent that timing is.
Think of it like a heartbeat. A healthy heart beats with a steady rhythm. A network with low jitter delivers packets at a steady, predictable rate. High jitter means packets arrive at erratic, unpredictable intervals — creating lag spikes, choppy audio, and video freezes.
Jitter is measured in milliseconds (ms) and is calculated as the average absolute difference between consecutive latency readings using the RFC 3550 method.
jitter.is sends a series of lightweight HTTP requests to your chosen target server and measures the round-trip time of each. The first few requests are "warm-up" pings that let your browser establish a TCP+TLS connection — these are excluded from the results to avoid false high readings.
After warm-up, each subsequent ping is recorded. Jitter is computed as the mean absolute deviation between consecutive ping values — the same formula used by VoIP systems (RFC 3550).
Packet loss is detected when a request times out or fails to return within 3 seconds.
Jitter tolerance varies by use case. A video streaming platform can buffer 2–3 seconds of content and absorb moderate jitter. But real-time applications like online gaming and video conferencing have almost zero tolerance for jitter spikes. Use this guide to interpret your results:
Ping (latency) measures the round-trip time for a data packet to travel from your device to a server and back. Unlike jitter, ping tells you the distance and processing overhead between you and the target.
< 20ms — Exceptional. You are very close to the server geographically, or the server has an edge node near you.
20–50ms — Excellent for gaming and real-time communication.
50–100ms — Good for most applications. Casual gaming is fine.
> 100ms — Noticeable delay. Fast-paced games will feel sluggish. VoIP may have awkward pauses.
Packet loss occurs when data packets travelling across a network fail to reach their destination. Even a small amount of packet loss can severely degrade real-time application performance.
0% — Perfect. No packets are being dropped.
0.1–1% — Barely noticeable for most uses. VoIP may have occasional brief audio glitches.
1–5% — Clearly problematic. You will experience stuttering in games and call quality issues.
> 5% — Severe. Investigate your router, modem, or contact your ISP immediately.
Understanding the root cause helps you fix the problem. High jitter most commonly comes from one of these sources: