FSPL Wi-Fi Coverage Calculator

FSPL, short of Free-space Path Loss, is the attenuation of radio energy between transmitter and receiver antennas. Below is the simple calculator of checking Wi-Fi range and signal strength base on the FSPL formula. You can select output power of Wi-Fi AP/Router/Booster, and select the antenna gain, then you will get the estimated signal strength in terms of theory.

The calculation is base on 2.4GHz Wi-Fi frequency. The 5.8GHz frequency will loss extra 6dB signal strength.

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dBm to Watt Conversion Table

dBm	Watts		dBm	Watts		dBm	Watts
0	1.0 mW		16	40 mW		32	1.6 W
1	1.3 mW		17	50 mW		33	2.0 W
2	1.6 mW		18	63 mW		34	2.5 W
3	2.0 mW		19	79 mW		35	3.2 W
4	2.5 mW		20	100 mW		36	4.0 W
5	3.2 mW		21	126 mW		37	5.0 W
6	4 mW		22	158 mW		38	6.3 W
7	5 mW		23	200 mW		39	8.0 W
8	6 mW		24	250 mW		40	10 W
9	8 mW		25	316 mW		41	13 W
10	10 mW		26	398 mW		42	16 W
11	13 mW		27	500 mW		43	20 W
12	16 mW		28	630 mW		44	25 W
13	20 mW		29	800 mW		45	32 W
14	25 mW		30	1.0 W		46	40 W
15	32 mW		31	1.3 W		47	50 W