Tools

Wireless Link Budget Calculator

Estimate maximum range, received power, and link margin for any wireless link — BLE, Zigbee, LoRa, WiFi, or custom RF. All math runs in your browser.

Presets

Parameters

TX Power (dBm)Transmit power at antenna portTX Antenna Gain (dBi)0 dBi = isotropicCable / Connector Loss (dB)Use 0 for PCB antennaRX Sensitivity (dBm)Negative value, e.g. −95RX Antenna Gain (dBi)0 dBi = isotropicFrequency (MHz)433, 868, 915, 2400, 5000…Link Margin (dB)Safety margin, typically 10–20 dB

EIRP

0.0 dBm

Effective radiated power

System Gain

95.0 dB

Max allowable path loss

Max Range (outdoor)

177 m

With 10 dB margin, free space

Max Range (indoor)

32 m

With 10 dB margin, n=3

Received Power vs Distance (free space)

Distance	Path Loss	RX Power	Margin
10 m	60.0 dB	-60.0 dBm	+35.0 dB
50 m	74.0 dB	-74.0 dBm	+21.0 dB
100 m	80.0 dB	-80.0 dBm	+15.0 dB
200 m	86.1 dB	-86.1 dBm	+8.9 dB
500 m	94.0 dB	-94.0 dBm	+1.0 dB
1.00 km	100.0 dB	-100.0 dBm	-5.0 dB
2.00 km	106.1 dB	-106.1 dBm	-11.1 dB
5.00 km	114.0 dB	-114.0 dBm	-19.0 dB
10.0 km	120.0 dB	-120.0 dBm	-25.0 dB

Green = margin ≥ 10 dB · Amber = positive but below margin · Red = below sensitivity