SG, Plato and Brix Converter with Conversion Chart

Converter

Specific gravity

Fermented sample? The ABV calculator corrects the refractometer for alcohol.

Wort correction factor

Refractometers are calibrated on sucrose and read high on wort. 1.04 is the usual factor. Check yours against a hydrometer once.

Degrees Plato

15.7°P

Specific gravity

1.064

Gravity points

Extract

167g/L

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Conversion chart

Tap a row to load it into the converter.

°P	SG	Points
0.5	1.002	2
1.0	1.004	4
1.5	1.006	6
2.0	1.008	8
2.5	1.010	10
3.0	1.012	12
3.5	1.014	14
4.0	1.016	16
4.5	1.018	18
5.0	1.020	20
5.5	1.022	22
6.0	1.024	24
6.5	1.026	26
7.0	1.028	28
7.5	1.030	30
8.0	1.032	32
8.5	1.034	34
9.0	1.036	36
9.5	1.038	38
10.0	1.040	40
10.5	1.042	42
11.0	1.044	44
11.5	1.046	46
12.0	1.048	48
12.5	1.050	50
13.0	1.053	53
13.5	1.055	55
14.0	1.057	57
14.5	1.059	59
15.0	1.061	61
15.5	1.063	63
16.0	1.065	65
16.5	1.068	68
17.0	1.070	70
17.5	1.072	72

°P	SG	Points
18.0	1.074	74
18.5	1.076	76
19.0	1.079	79
19.5	1.081	81
20.0	1.083	83
20.5	1.085	85
21.0	1.087	87
21.5	1.090	90
22.0	1.092	92
22.5	1.094	94
23.0	1.096	96
23.5	1.099	99
24.0	1.101	101
24.5	1.103	103
25.0	1.106	106
25.5	1.108	108
26.0	1.110	110
26.5	1.113	113
27.0	1.115	115
27.5	1.117	117
28.0	1.120	120
28.5	1.122	122
29.0	1.124	124
29.5	1.127	127
30.0	1.129	129
30.5	1.132	132
31.0	1.134	134
31.5	1.136	136
32.0	1.139	139
32.5	1.141	141
33.0	1.144	144
33.5	1.146	146
34.0	1.149	149
34.5	1.151	151
35.0	1.154	154

SG	°P	g/L
1.000	-0.0	-0
1.002	0.5	5
1.004	1.0	10
1.006	1.5	15
1.008	2.1	21
1.010	2.6	26
1.012	3.1	31
1.014	3.6	36
1.016	4.1	41
1.018	4.6	47
1.020	5.1	52
1.022	5.6	57
1.024	6.1	62
1.026	6.6	67
1.028	7.1	73
1.030	7.6	78
1.032	8.0	83
1.034	8.5	88
1.036	9.0	93
1.038	9.5	99
1.040	10.0	104
1.042	10.5	109
1.044	11.0	114
1.046	11.4	120
1.048	11.9	125
1.050	12.4	130
1.052	12.9	135
1.054	13.3	141
1.056	13.8	146
1.058	14.3	151
1.060	14.7	156
1.062	15.2	162
1.064	15.7	167
1.066	16.1	172
1.068	16.6	177
1.070	17.1	182
1.072	17.5	188
1.074	18.0	193

SG	°P	g/L
1.076	18.4	198
1.078	18.9	204
1.080	19.3	209
1.082	19.8	214
1.084	20.2	219
1.086	20.7	225
1.088	21.1	230
1.090	21.6	235
1.092	22.0	240
1.094	22.5	246
1.096	22.9	251
1.098	23.3	256
1.100	23.8	261
1.102	24.2	267
1.104	24.6	272
1.106	25.1	277
1.108	25.5	283
1.110	25.9	288
1.112	26.4	293
1.114	26.8	298
1.116	27.2	304
1.118	27.6	309
1.120	28.1	314
1.122	28.5	320
1.124	28.9	325
1.126	29.3	330
1.128	29.7	335
1.130	30.2	341
1.132	30.6	346
1.134	31.0	351
1.136	31.4	357
1.138	31.8	362
1.140	32.2	367
1.142	32.6	373
1.144	33.0	378
1.146	33.4	383
1.148	33.8	388
1.150	34.2	394

Method

SG to Plato uses the ASBC cubic polynomial:

°P = −616.868 + 1111.14 × SG − 630.272 × SG² + 135.997 × SG³

Plato to SG uses the inverse approximation standard in brewing software:

SG = 1 + °P / (258.6 − (°P / 258.2) × 227.1)

Refractometer readings are divided by the wort correction factor before conversion. Gravity points are (SG − 1) × 1000. Extract is °P × SG × 10, in grams per litre. Both formulas assume unfermented wort from 1.000 to 1.150 SG. A refractometer reading on fermented beer needs an alcohol correction, which this tool does not apply.

Questions

How do you convert specific gravity to degrees Plato?

Use the ASBC cubic polynomial: °P = −616.868 + 1111.14 × SG − 630.272 × SG² + 135.997 × SG³. As a rule of thumb, divide the gravity points by four: 1.048 is 48 points, so about 12 °P. The polynomial gives 11.9 °P. The shortcut drifts as gravity rises: about half a degree high at 1.070, more than a full degree high at 1.100.

Are Plato and Brix the same thing?

On paper, almost: both express dissolved sugar as a percentage by weight and match to three decimals in specific gravity. In the brewhouse, no. A refractometer is calibrated on pure sucrose and reads high on wort because wort contains other dissolved solids. Divide the Brix reading by a wort correction factor, usually 1.04, to get degrees Plato. A hydrometer reads Plato directly and needs no correction.

What is 12 °P in specific gravity?

12 °P is 1.048 SG, or 48 gravity points, which is about 126 grams of extract per litre of wort. 1.048 is a common original gravity for a pale ale.

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Specific gravity, Plato and Brix, converted properly

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