dBm is a value indicating the absolute value of power (it can also be considered as a ratio based on 1mW power), and the calculation formula is

dBm=10log(power/1mW)

mW=power (10,dBm/10)

W=(power(10,dBm/10))/1000

Conversion Table

dBm	mw	dBm	mw	dBm	W	dBm	W
-100	0.0000000001000000	-50	0.0000100000000000	0	0.001	50	100.000
-99	0.0000000001258925	-49	0.0000125892541179	1	0.001	51	125.893
-98	0.0000000001584893	-48	0.0000158489319246	2	0.002	52	158.489
-97	0.0000000001995262	-47	0.0000199526231497	3	0.002	53	199.526
-96	0.0000000002511886	-46	0.0000251188643151	4	0.003	54	251.189
-95	0.0000000003162278	-45	0.0000316227766017	5	0.003	55	316.228
-94	0.0000000003981072	-44	0.0000398107170553	6	0.004	56	398.107
-93	0.0000000005011872	-43	0.0000501187233627	7	0.005	57	501.187
-92	0.0000000006309573	-42	0.0000630957344480	8	0.006	58	630.957
-91	0.0000000007943282	-41	0.0000794328234724	9	0.008	59	794.328
-90	0.0000000010000000	-40	0.0001000000000000	10	0.010	60	1000.000
-89	0.0000000012589254	-39	0.0001258925411794	11	0.013	61	1258.925
-88	0.0000000015848932	-38	0.0001584893192461	12	0.016	62	1584.893
-87	0.0000000019952623	-37	0.0001995262314969	13	0.020	63	1995.262
-86	0.0000000025118864	-36	0.0002511886431510	14	0.025	64	2511.886
-85	0.0000000031622777	-35	0.0003162277660168	15	0.032	65	3162.278
-84	0.0000000039810717	-34	0.0003981071705535	16	0.040	66	3981.072
-83	0.0000000050118723	-33	0.0005011872336273	17	0.050	67	5011.872
-82	0.0000000063095734	-32	0.0006309573444802	18	0.063	68	6309.573
-81	0.0000000079432823	-31	0.0007943282347243	19	0.079	69	7943.282
-80	0.0000000100000000	-30	0.0010000000000000	20	0.100	70	10000.000
-79	0.0000000125892541	-29	0.0012589254117942	21	0.126	71	12589.254
-78	0.0000000158489319	-28	0.0015848931924611	22	0.158	72	15848.932
-77	0.0000000199526231	-27	0.0019952623149689	23	0.200	73	19952.623
-76	0.0000000251188643	-26	0.0025118864315096	24	0.251	74	25118.864
-75	0.0000000316227766	-25	0.0031622776601684	25	0.316	75	31622.777
-74	0.0000000398107171	-24	0.0039810717055350	26	0.398	76	39810.717
-73	0.0000000501187234	-23	0.0050118723362727	27	0.501	77	50118.723
-72	0.0000000630957344	-22	0.0063095734448019	28	0.631	78	63095.734
-71	0.0000000794328235	-21	0.0079432823472428	29	0.794	79	79432.823
-70	0.0000001000000000	-20	0.0100000000000000	30	1.000	80	100000.000
-69	0.0000001258925412	-19	0.0125892541179417	31	1.259	81	125892.541
-68	0.0000001584893192	-18	0.0158489319246111	32	1.585	82	158489.319
-67	0.0000001995262315	-17	0.0199526231496888	33	1.995	83	199526.231
-66	0.0000002511886432	-16	0.0251188643150958	34	2.512	84	251188.643
-65	0.0000003162277660	-15	0.0316227766016838	35	3.162	85	316227.766
-64	0.0000003981071706	-14	0.0398107170553497	36	3.981	86	398107.171
-63	0.0000005011872336	-13	0.0501187233627272	37	5.012	87	501187.234
-62	0.0000006309573445	-12	0.0630957344480193	38	6.310	88	630957.344
-61	0.0000007943282347	-11	0.0794328234724281	39	7.943	89	794328.235
-60	0.0000010000000000	-10	0.1000000000000000	40	10.000	90	1000000.000
-59	0.0000012589254118	-9	0.1258925411794170	41	12.589	91	1258925.412
-58	0.0000015848931925	-8	0.1584893192461110	42	15.849	92	1584893.192
-57	0.0000019952623150	-7	0.1995262314968880	43	19.953	93	1995262.315
-56	0.0000025118864315	-6	0.2511886431509580	44	25.119	94	2511886.432
-55	0.0000031622776602	-5	0.3162277660168380	45	31.623	95	3162277.660
-54	0.0000039810717055	-4	0.3981071705534970	46	39.811	96	3981071.706
-53	0.0000050118723363	-3	0.5011872336272720	47	50.119	97	5011872.336
-52	0.0000063095734448	-2	0.6309573444801930	48	63.096	98	6309573.445
-51	0.0000079432823472	-1	0.7943282347242810	49	79.433	99	7943282.347

mw	dBm	mw	dBm	W	dBm	W	dBm
1	0	51	17.08	0.1	20	42	46.23
2	3.01	52	17.16	0.2	23.01	43	46.33
3	4.77	53	17.24	0.3	24.77	44	46.43
4	6.02	54	17.32	0.4	26.02	45	46.53
5	6.99	55	17.4	0.5	26.99	46	46.63
6	7.78	56	17.48	0.6	27.78	47	46.72
7	8.45	57	17.56	0.7	28.45	48	46.81
8	9.03	58	17.63	0.8	29.03	49	46.9
9	9.54	59	17.71	0.9	29.54	50	46.99
10	10	60	17.78	1	30	51	47.08
11	10.41	61	17.85	2	33.01	52	47.16
12	10.79	62	17.92	3	34.77	53	47.24
13	11.14	63	17.99	4	36.02	54	47.32
14	11.46	64	18.06	5	36.99	55	47.4
15	11.76	65	18.13	6	37.78	56	47.48
16	12.04	66	18.2	7	38.45	57	47.56
17	12.3	67	18.26	8	39.03	58	47.63
18	12.55	68	18.33	9	39.54	59	47.71
19	12.79	69	18.39	10	40	60	47.78
20	13.01	70	18.45	11	40.41	61	47.85
21	13.22	71	18.51	12	40.79	62	47.92
22	13.42	72	18.57	13	41.14	63	47.99
23	13.62	73	18.63	14	41.46	64	48.06
24	13.8	74	18.69	15	41.76	65	48.13
25	13.98	75	18.75	16	42.04	66	48.2
26	14.15	76	18.81	17	42.3	67	48.26
27	14.31	77	18.86	18	42.55	68	48.33
28	14.47	78	18.92	19	42.79	69	48.39
29	14.62	79	18.98	20	43.01	70	48.45
30	14.77	80	19.03	21	43.22	71	48.51
31	14.91	81	19.08	22	43.42	72	48.57
32	15.05	82	19.14	23	43.62	73	48.63
33	15.19	83	19.19	24	43.8	74	48.69
34	15.31	84	19.24	25	43.98	75	48.75
35	15.44	85	19.29	26	44.15	76	48.81
36	15.56	86	19.34	27	44.31	77	48.86
37	15.68	87	19.4	28	44.47	78	48.92
38	15.8	88	19.44	29	44.62	79	48.98
39	15.91	89	19.49	30	44.77	80	49.03
40	16.02	90	19.54	31	44.91	81	49.08
41	16.13	91	19.59	32	45.05	82	49.14
42	16.23	92	19.64	33	45.19	83	49.19
43	16.33	93	19.68	34	45.31	84	49.24
44	16.43	94	19.73	35	45.44	85	49.29
45	16.53	95	19.78	36	45.56	86	49.34
46	16.63	96	19.82	37	45.68	87	49.4
47	16.72	97	19.87	38	45.8	88	49.44
48	16.81	98	19.91	39	45.91	89	49.49
49	16.9	99	19.96	40	46.02	90	49.54
50	16.99	100	20	41	46.13	91	49.59