Wi-Fi Coverage Planner
Sketch your apartment on a canvas — drag to draw walls of drywall, brick, concrete or glass — drop in one or more routers, and watch a live signal heatmap paint the floor. The physics is the standard free-space path-loss formula plus a per-wall attenuation for every wall a straight ray crosses (drywall ~3 dB, brick ~8, concrete ~12, glass ~2 at 2.4 GHz, roughly double at 5 GHz). Toggle between the bands to see the classic trade-off: 5 GHz is faster but dies at the second brick wall, 2.4 GHz limps through everything. The legend maps colors to realistic throughput expectations, and the status line scores how much of the floor gets a good signal — perfect for deciding where the router or a mesh node should actually go.
Runs 100% in your browser — simulations are computed locally on your device.
Read the full guide to this tool
Notes
- The model traces a straight ray from each router to each point and adds a fixed loss per wall crossing — no multipath, reflections or furniture, so treat the map as a comparative guide, not a survey.
- Signal color bands follow common site-survey practice: above −55 dBm is excellent, −67 dBm is the usual floor for streaming and calls, below −75 dBm expect dropouts.
- Wall attenuations are typical published averages; a concrete wall with rebar or a mirror can be far worse.
- Antenna gain and transmit power are bundled into one EIRP figure (default 20 dBm, the 2.4 GHz regulatory limit in much of the world).
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