How far does WiFi reach through walls?

WiFi range through walls depends on the frequency band and wall material. At 2.4 GHz, a signal can travel 150–300 feet in open air, but each drywall reduces range by 3–5 dB, concrete by 10–15 dB, and brick by 6–10 dB. After 3 drywall walls, expect roughly 40–60% of the original range. - 2.4 GHz penetrates walls best — 150–300 ft open-air range, ~100–200 ft through 2 drywall walls - 5 GHz offers faster speeds but ~40% less range through obstacles vs 2.4 GHz - 6 GHz (WiFi 6E) has the shortest range — best for same-room, high-speed connections - Concrete and metal walls can reduce signal by 10–25 dB per wall, often killing the connection entirely - Each floor/ceiling adds 10–15 dB loss — equivalent to 2–3 drywall walls

How many WiFi access points do I need for my house?

Most homes under 1,500 sq ft with drywall walls need just 1 router placed centrally. Homes between 1,500–3,000 sq ft typically need 2 access points, and homes over 3,000 sq ft or multi-story homes with concrete or brick walls may need 3 or more mesh nodes for reliable coverage. - Under 1,500 sq ft (1 floor, drywall): 1 router is usually enough if placed centrally - 1,500–3,000 sq ft or 2 floors: 2-pack mesh system (e.g., Google Nest, TP-Link Deco) - 3,000–5,000 sq ft or 3+ floors: 3-pack mesh system recommended - Concrete/brick homes may need 50–100% more APs than drywall homes of the same size - Place APs on each floor for multi-story homes — floor/ceiling loss is 10–15 dB

What is the difference between 2.4 GHz, 5 GHz, and 6 GHz WiFi?

2.4 GHz provides the best range and wall penetration but tops out around 600 Mbps with WiFi 6. 5 GHz offers speeds up to 2.4 Gbps with shorter range. 6 GHz (WiFi 6E/7) delivers up to 4.8 Gbps but has the shortest range and worst wall penetration, making it best for nearby devices. - 2.4 GHz: best range (150–300 ft), best wall penetration, max ~600 Mbps (WiFi 6), most congested band - 5 GHz: moderate range (50–150 ft), max ~2.4 Gbps, good balance of speed and range - 6 GHz: shortest range (30–75 ft), max ~4.8 Gbps, least interference, requires WiFi 6E/7 devices - Most modern routers are tri-band and broadcast on all three simultaneously - Use 2.4 GHz for IoT devices and distant rooms; 5/6 GHz for streaming and gaming near the router

Where should I place my WiFi router for best coverage?

Place your router in the center of your home, elevated on a shelf or mounted high on a wall. Avoid placing it in a corner, inside a cabinet, near metal objects, or next to a microwave. Central placement can provide up to 100% more coverage area compared to corner placement. - Center of home gives ~100% coverage; corner placement reduces effective area to ~50% - Elevate the router 4–6 feet off the ground — signals radiate outward and slightly downward - Keep away from microwaves, baby monitors, and cordless phones (2.4 GHz interference) - Avoid metal shelving, mirrors, and aquariums — they reflect and absorb WiFi signals - For multi-story homes, place the router on the middle floor for best vertical coverage

What is Free Space Path Loss and how does it affect WiFi?

Free Space Path Loss (FSPL) is the natural signal weakening as radio waves travel through air. The formula is FSPL(dB) = 20×log10(d) + 20×log10(f) − 27.55, where d is distance in meters and f is frequency in MHz. Higher frequencies lose more signal over the same distance, which is why 5 GHz has shorter range than 2.4 GHz. - FSPL increases with both distance and frequency — doubling distance adds ~6 dB loss - 5 GHz has ~6 dB more FSPL than 2.4 GHz at the same distance - Typical router transmit power is 20 dBm (100 mW) by FCC regulation - Good signal requires ≥−65 dBm; moderate ≥−70 dBm; usable ≥−80 dBm - Wall and floor losses add on top of FSPL, further reducing effective range

WiFi Coverage Calculator

Estimate wireless coverage radius, signal loss through walls, and mesh system needs

Coverage Radius (Good)

17 ft

Access Points Needed

Wall Loss

12.0 dB

Units

Home Area (sq ft)

Number of Floors

Wall Material

Walls to Penetrate

Number of interior walls between router and farthest room

WiFi Band

Router Placement

Coverage Estimate

17 ft

Good signal radius (≥-65 dBm)

Moderate Range

29 ft

≥-70 dBm

Weak Range

93 ft

≥-80 dBm

Home Coverage Zones

Good Signal38%

Moderate Signal100%

Weak Signal100%

Percentage of home area within each signal quality zone

Signal Loss Breakdown

Router Transmit Power+20 dBm

Wall Attenuation (3 drywall / wood walls)−12.0 dB

Floor Attenuation (1 floor)−12.5 dB

Total Obstacle Loss−24.5 dB

Signal Strength by Distance

Distance	Signal	Quality
10 ft	-61 dBm	Good
20 ft	-67 dBm	Moderate
30 ft	-70 dBm	Weak
50 ft	-75 dBm	Weak
75 ft	-78 dBm	Weak
100 ft	-81 dBm	No Signal

Recommendation

Access Points Needed: 5

A 5-node mesh system or enterprise-grade APs are recommended for full coverage.

Band Note

5 GHz offers faster speeds (up to ~2.4 Gbps) but shorter range and more wall penetration loss.

Wall Attenuation Reference

Material	Loss per Wall
Drywall / Wood	3–5 dB
Brick	6–10 dB
Concrete	10–15 dB
Metal	15–25 dB
Glass	2–3 dB
Floor / Ceiling	10–15 dB

Home Size	Floors	Recommended APs
Under 1,500 sq ft	1	1 router
1,500–2,500 sq ft	1–2	2 mesh nodes
2,500–4,000 sq ft	2–3	3 mesh nodes
4,000+ sq ft	2+	4+ mesh nodes or wired APs

Home Size	Floors	Recommended APs
Under 1,500 sq ft	1	1 router
1,500–2,500 sq ft	1–2	2 mesh nodes
2,500–4,000 sq ft	2–3	3 mesh nodes
4,000+ sq ft	2+	4+ mesh nodes or wired APs

Wall Material	Loss per Wall (dB)	Range Reduction
Drywall / Wood	3–5 dB	~15–25%
Brick	6–10 dB	~35–50%
Concrete	10–15 dB	~55–75%
Metal	15–25 dB	~80–95%
Glass	2–3 dB	~10–15%

Band	Max Speed (WiFi 6/6E)	Typical Indoor Range
2.4 GHz	~600 Mbps	150–300 ft
5 GHz	~2,400 Mbps	50–150 ft
6 GHz	~4,800 Mbps	30–75 ft

WiFi Coverage Calculator

Home Details

Wall Construction