To convert from Voltage Standing Wave Ratio (VSWR) to Return Loss (RL), find the VSWR value in the left column. The corresponding value in the right column is the RL value.

VSWR	RL	VSWR	RL	VSWR	RL	VSWR	RL	VSWR	RL
1.0000	-INF	1.0001	-86.0210	1.0002	-80.0009	1.0003	-76.4795	1.0004	-73.9811
1.0005	-72.0434	1.0006	-70.4602	1.0007	-69.1217	1.0008	-67.9623	1.0009	-66.9397
1.001	-66.0249	1.002	-60.0087	1.003	-56.4912	1.004	-53.9968	1.005	-52.0629
1.006	-50.4836	1.007	-49.1490	1.008	-47.9935	1.009	-46.9747	1.010	-46.0639
1.01	-46.0639	1.02	-40.0864	1.03	-36.6075	1.04	-34.1514	1.05	-32.2557
1.06	-30.7143	1.07	-29.4174	1.08	-28.2995	1.09	-27.3181	1.10	-26.4444
1.11	-25.6578	1.12	-24.9431	1.13	-24.2887	1.14	-23.6857	1.15	-23.1269
1.16	-22.6067	1.17	-22.1202	1.18	-21.6637	1.19	-21.2338	1.20	-20.8279
1.21	-20.4435	1.22	-20.0786	1.23	-19.7315	1.24	-19.4007	1.25	-19.0849
1.26	-18.7827	1.27	-18.4932	1.28	-18.2155	1.29	-17.9487	1.30	-17.6921
1.31	-17.4450	1.32	-17.2068	1.33	-16.9768	1.34	-16.7547	1.35	-16.5400
1.36	-16.3322	1.37	-16.1309	1.38	-15.9359	1.39	-15.7467	1.40	-15.5630
1.41	-15.3847	1.42	-15.2113	1.43	-15.0428	1.44	-14.8787	1.45	-14.7191
1.46	-14.5635	1.47	-14.4120	1.48	-14.2642	1.49	-14.1201	1.50	-13.9794
1.51	-13.8421	1.52	-13.7079	1.53	-13.5769	1.54	-13.4488	1.55	-13.3235
1.56	-13.2010	1.57	-13.0812	1.58	-12.9638	1.59	-12.8490	1.60	-12.7364
1.61	-12.6262	1.62	-12.5182	1.63	-12.4123	1.64	-12.3085	1.65	-12.2067
1.66	-12.1068	1.67	-12.0087	1.68	-11.9125	1.69	-11.8181	1.70	-11.7253
1.71	-11.6342	1.72	-11.5447	1.73	-11.4568	1.74	-11.3704	1.75	-11.2854
1.76	-11.2019	1.77	-11.1198	1.78	-11.0390	1.79	-10.9595	1.80	-10.8814
1.81	-10.8044	1.82	-10.7287	1.83	-10.6542	1.84	-10.5808	1.85	-10.5085
1.86	-10.4374	1.87	-10.3673	1.88	-10.2982	1.89	-10.2302	1.90	-10.1631
1.91	-10.0970	1.92	-10.0319	1.93	-9.9677	1.94	-9.9044	1.95	-9.8420
1.96	-9.7804	1.97	-9.7197	1.98	-9.6598	1.99	-9.6007	2.00	-9.5424
2.1	-8.9994	2.2	-8.5194	2.3	-8.0914	2.4	-7.7070	2.5	-7.3595
2.6	-7.0437	2.7	-6.7551	2.8	-6.4902	2.9	-6.2462	3.0	-6.0206
3.1	-5.8113	3.2	-5.6165	3.3	-5.4348	3.4	-5.2648	3.5	-5.1055
3.6	-4.9557	3.7	-4.8147	3.8	-4.6817	3.9	-4.5560	4.0	-4.4370
4.1	-4.3242	4.2	-4.2171	4.3	-4.1152	4.4	-4.0183	4.5	-3.9259
4.6	-3.8377	4.7	-3.7535	4.8	-3.6729	4.9	-3.5957	5.0	-3.5218
5.1	-3.4509	5.2	-3.3828	5.3	-3.3174	5.4	-3.2545	5.5	-3.1940
5.6	-3.1357	5.7	-3.0795	5.8	-3.0254	5.9	-2.9731	6.0	-2.9226
6.1	-2.8738	6.2	-2.8266	6.3	-2.7809	6.4	-2.7368	6.5	-2.6940
6.6	-2.6525	6.7	-2.6123	6.8	-2.5733	6.9	-2.5355	7.0	-2.4988
7.1	-2.4631	7.2	-2.4284	7.3	-2.3948	7.4	-2.3620	7.5	-2.3301
7.6	-2.2991	7.7	-2.2689	7.8	-2.2395	7.9	-2.2108	8.0	-2.1829
8.1	-2.1557	8.2	-2.1291	8.3	-2.1032	8.4	-2.0779	8.5	-2.0532
8.6	-2.0292	8.7	-2.0056	8.8	-1.9826	8.9	-1.9602	9.0	-1.9382
9.1	-1.9167	9.2	-1.8957	9.3	-1.8752	9.4	-1.8551	9.5	-1.8354
9.6	-1.8161	9.7	-1.7973	9.8	-1.7788	9.9	-1.7607	10.0	-1.7430
11	-1.5836	12	-1.4510	13	-1.3389	14	-1.2430	15	-1.1598
16	-1.0872	17	-1.0231	18	-0.9661	19	-0.9151	20	-0.8693
21	-0.8279	22	-0.7902	23	-0.7558	24	-0.7242	25	-0.6952
26	-0.6685	27	-0.6437	28	-0.6207	29	-0.5993	30	-0.5793
31	-0.5606	32	-0.5430	33	-0.5266	34	-0.5111	35	-0.4965
36	-0.4827	37	-0.4696	38	-0.4573	39	-0.4455	40	-0.4344
41	-0.4238	42	-0.4137	43	-0.4041	44	-0.3949	45	-0.3861
46	-0.3777	47	-0.3697	48	-0.3620	49	-0.3546	50	-0.3475
51	-0.3407	52	-0.3341	53	-0.3278	54	-0.3217	55	-0.3159
56	-0.3102	57	-0.3048	58	-0.2995	59	-0.2945	60	-0.2896
61	-0.2848	62	-0.2802	63	-0.2758	64	-0.2715	65	-0.2673
66	-0.2632	67	-0.2593	68	-0.2555	69	-0.2518	70	-0.2482
71	-0.2447	72	-0.2413	73	-0.2380	74	-0.2348	75	-0.2316
76	-0.2286	77	-0.2256	78	-0.2227	79	-0.2199	80	-0.2172
81	-0.2145	82	-0.2119	83	-0.2093	84	-0.2068	85	-0.2044
86	-0.2020	87	-0.1997	88	-0.1974	89	-0.1952	90	-0.1930
91	-0.1909	92	-0.1888	93	-0.1868	94	-0.1848	95	-0.1829
96	-0.1810	97	-0.1791	98	-0.1773	99	-0.1755	100	-0.1737