WiFi Coverage Simulator Calculator

Calculator Inputs

Area Length (m)

Area Width (m)

Frequency (MHz)

Router X Position (m)

Router Y Position (m)

Grid Resolution

Transmit Power (dBm)

Transmit Antenna Gain (dBi)

Client Antenna Gain (dBi)

Receiver Sensitivity (dBm)

Target Signal Threshold (dBm)

Path Loss Exponent

Average Wall Count

Loss Per Wall (dB)

Floor Count

Loss Per Floor (dB)

Fade Margin (dB)

Interference Margin (dB)

Tip: Use average wall and floor counts to reflect the typical obstruction between the access point and users.

Formula Used

1) Effective isotropic radiated power: EIRP = Transmit Power + Transmit Antenna Gain

2) Reference loss at one meter: L1m = -27.55 + 20 × log10(Frequency in MHz)

3) Indoor path loss model: Path Loss = L1m + 10 × n × log10(d) + Wall Loss + Floor Loss + Interference Margin

4) Estimated received signal: RSSI = EIRP + Client Gain - Path Loss

5) Planned radius: Radius = 10 ^ ((Link Budget - L1m) / (10 × n))

6) Coverage percentage: Covered Cells ÷ Total Cells × 100

This is a planning model. Real performance also changes with channel congestion, antenna pattern, furniture density, device quality, and multipath behavior.

How to Use This Calculator

Enter the room or floor dimensions in meters.
Place the router by setting X and Y coordinates within the area.
Choose frequency, transmit power, and antenna gains.
Set receiver sensitivity and your preferred target signal threshold.
Estimate the average wall and floor barriers between users and the router.
Adjust fade and interference margins for conservative planning.
Click Simulate Coverage to generate the results and heatmap.
Review reliable coverage, edge connectivity, and suggested access point count.
Export the output to CSV or PDF for planning notes.

Example Data Table

Parameter	Sample Value	Reason
Area Size	45 m × 30 m	Represents a medium office floor.
Router Position	22.5 m, 15 m	Places the router near the center.
Frequency	5200 MHz	Common for 5 GHz indoor deployments.
Transmit Power	20 dBm	Typical enterprise or strong home radio output.
Transmit Gain	5 dBi	Moderate access point antenna gain.
Client Gain	2 dBi	Represents a laptop or phone antenna.
Receiver Sensitivity	-85 dBm	Edge connectivity threshold.
Target Signal	-67 dBm	Useful benchmark for reliable coverage.
Path Loss Exponent	3.0	Reasonable indoor mixed-partition estimate.
Walls / Wall Loss	2 walls / 4 dB each	Moderate obstruction path.
Floors / Floor Loss	0 floors / 15 dB	Single-floor planning scenario.
Fade + Interference Margin	10 dB + 4 dB	Adds planning safety for real conditions.

FAQs

1. What does this simulator estimate?

It estimates indoor signal strength, reliable coverage radius, edge connectivity, and percentage of the area meeting your chosen target threshold. It also visualizes predicted signal distribution on a heatmap.

2. Is this a replacement for a real site survey?

No. It is a planning tool. Actual WiFi results depend on materials, furniture, user density, interference, antenna pattern, channel width, and device behavior. Field measurements remain essential.

3. How do wall and floor inputs affect the results?

Each wall and floor adds attenuation. More barriers reduce predicted RSSI, shrink reliable radius, and lower coverage percentage. Use average obstruction values for more realistic indoor planning.

4. What path loss exponent should I use?

Open spaces often use values near 2.0 to 2.4. Typical indoor offices may sit around 2.8 to 3.5. Dense layouts with stronger attenuation can climb higher.

5. Why is the target signal threshold different from sensitivity?

Receiver sensitivity marks the rough edge of connectivity. Target signal is stronger and represents the level you want for reliable user experience, stable data rates, and fewer performance complaints.

6. Should I simulate 2.4 GHz or 5 GHz?

Use the band you plan to deploy. Lower frequencies often travel farther through obstacles, while higher frequencies usually provide more capacity but can lose strength faster indoors.

7. What does suggested access point count mean?

It is a rough planning estimate based on reliable coverage radius and floor area. It does not replace capacity planning, roaming design, channel reuse analysis, or bandwidth forecasting.

8. Why export the results to CSV or PDF?

CSV helps compare scenarios in spreadsheets. PDF gives a quick planning snapshot for reports, approvals, deployment notes, or client communication.