Internet Speed Test
Measure real browser throughput and HTTP latency using Cloudflare edge nodes. Bounded transfer capped at 18.2 MB with transparent data usage.
Best solution
Network diagnostic: Internet Speed Test; HTTP Round-Trip Latency (ms).
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HTTP latency: —
Ready when you are
Cloudflare receives the test traffic and your connection address. Optional result logging is disabled. No packet-loss or Wi-Fi signal measurement.
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Methodology & calculation rule
Throughput (Mbps) = (Bytes Transferred × 8) ÷ (Transfer Duration in seconds × 1,000,000) using chunked parallel HTTP streams.
Network observations execute bounded requests to public measurement backends (ipify, Google Public DNS, Globalping, or Cloudflare). Measurements distinguish local client configuration from external internet reachability.
No browsing history, private tokens, or credentials are captured. Results are snapshots of external probe vantage points at the recorded observation timestamp.
Real-World Context & Technical Standards
Megabits (Mbps) vs. Megabytes (MB/s)
Broadband speeds are marketed in megabits per second (Mbps). Dividing by 8 gives the raw theoretical megabytes per second (e.g. 100 Mbps = 12.5 MB/s) prior to TCP/IP packet header overhead.
Ramping Throughput Windows
TCP connections begin with a small congestion window and progressively double it with each round-trip acknowledgment until link capacity is saturated or packet loss occurs.
Loaded vs. Unloaded Ping Times
Unloaded latency measures empty link response times, whereas loaded latency measures responsiveness during active multi-megabyte downloads when router packet buffers fill to capacity.
Related network diagnostic tools
| Tool | Metric | Scope |
|---|---|---|
| What Is My IP Address? | Diagnostic | what is my ip address |
| IP Address Lookup | Diagnostic | ip address lookup |
| Remote Ping Test | Diagnostic | ping test |
| DNS Lookup | Diagnostic | dns lookup |
| Is It Down? | Diagnostic | is it down |
Frequently Asked Questions
What is the difference between Mbps and MB/s?
Internet speeds are measured in megabits per second (Mbps). File downloads in operating systems are displayed in megabytes per second (MB/s). Divide Mbps by 8 to estimate MB/s (e.g., 100 Mbps ≈ 12.5 MB/s).
Why does my Wi-Fi speed test differ from my contracted ISP speed?
Wi-Fi overhead, distance from access points, wall attenuation, 2.4 GHz vs 5 GHz band congestion, and other devices sharing your local network reduce effective throughput below wired Ethernet speeds.