Wi-Fi Coverage Calculator

Why Wi-Fi coverage is not just about speed

Most people buy a faster internet plan when their connection feels slow, but the real problem is often coverage, not speed. A router shouting from one corner of the house cannot push a clean signal through concrete walls to the far bedroom — no matter how many megabits your plan advertises. This calculator answers the question people actually need: how many routers or mesh nodes does my space need?

How the calculation works

Routers needed = area to cover ÷ effective coverage of one router

Each router type covers a different area. A standard home router reaches roughly 150 m² (about 1,600 sq ft) in open space. Mesh nodes cover slightly less each — around 140 m² — but link together into one seamless network. Long-range routers with stronger antennas reach about 230 m².

Walls eat your signal

Walls are the silent killer of Wi-Fi range. A single concrete or brick wall can cut a signal's reach dramatically, while wooden partitions barely matter. The calculator reduces each router's effective coverage by about 10% per thick wall (never below half), so a home full of concrete walls gets an honest answer instead of an optimistic one.

Example

Take a 180 m² apartment with two thick concrete walls and a standard router: effective coverage becomes 150 × (1 − 0.2) = 120 m². Routers needed = 180 ÷ 120 = 1.5, rounded up to 2. Two units — ideally a mesh pair — will cover it; a single router would leave dead zones.

Single router or mesh?

If the answer is 1, a well-placed single router does the job. If it is 2 or more, a mesh system usually beats multiple standalone routers: devices roam between nodes automatically without dropping, and you manage everything from one app. Mixing random old routers can create competing networks that fight each other.

Tips for better coverage

• Place the main router centrally and elevated — not on the floor in a corner.
• Keep routers away from microwaves, metal cabinets and thick mirrors.
• Use the 5 GHz band near the router for speed and 2.4 GHz at distance for reach.
• Update router firmware; manufacturers quietly improve range and stability.
• Re-run this calculator if you renovate or add an extension — walls change everything.

Coverage figures are typical real-world estimates; building materials, interference and router placement all affect the result.