% v/v

95%

90%

85%

80%

75%

70%

65%

60%

55%

50%

45%

40%

35%

30%

25%

20%

15%

Volume Units of Pure Water to Add to Each 100 Volume Units of Alcohol

90%

6.41

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

85%

13.33

6.58

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

80%

20.9

13.8

6.83

-

-

-

-

-

-

-

-

-

-

-

-

-

-

75%

29.5

21.9

14.5

7.2

-

-

-

-

-

-

-

-

-

-

-

-

-

70%

39.1

31.0

23.1

15.3

7.64

-

-

-

-

-

-

-

-

-

-

-

-

65%

50.2

41.5

33.0

24.6

16.4

8.15

-

-

-

-

-

-

-

-

-

-

-

60%

63.0

53.6

44.2

35.4

26.5

17.6

8.76

-

-

-

-

-

-

-

-

-

-

55%

78.0

67.8

57.9

48.0

38.3

28.6

19.0

9.5

-

-

-

-

-

-

-

-

-

50%

95.9

84.8

73.9

63.1

52.4

41.7

31.3

20.5

10.4

-

-

-

-

-

-

-

-

45%

118

105

93.3

81.3

69.5

57.8

46.0

34.5

22.9

11.4

-

-

-

-

-

-

-

40%

144

131

117

104

90.8

77.6

64.5

51.4

38.5

25.6

12.7

-

-

-

-

-

-

35%

179

163

148

133

118

103

88.0

73.0

58.3

43.6

29.0

14.4

-

-

-

-

-

30%

224

206

189

171

154

136

119

102

85.0

67.5

50.5

33.5

16.7

-

-

-

-

25%

287

266

245

224

204

183

162

142

121

101

80.4

60.2

40.0

20.0

-

-

-

20%

382

356

330

304

278

253

227

201

176

150.6

125.2

100

75.0

49.9

24.9

-

-

15%

540

505

471

437

403

369

335

301

267

234

200

166.4

133

96.7

66.4

33.2

-

10%

855.6

804

753

703

652.2

602

551

500.6

450.2

400

350

300

249.4

199.4

150

100

50

Alcohol water mixtures are non-volume additive mixtures. This table may be used to determine the volume of water needed to reduce known volume strengths of alcohol solutions (such as distilled spirits or sensory evaluation or the cutting of spirits to desired final strengths) to desired volume/volume strengths.

Example calculation of DATA: [Requires "RESPECTIVE VOLUMES OF ALCOHOL AND WATER AND THE SPECIFIC GRAVITY IN BOTH AIR AND VACUUM OF SPIRITUOUS LIQUOR" - or its equivalent - from the US Gov. Gauging Manual: “Respective Volumes of Alcohol and Water”. In reducing 95% (vol.) to 85% (vol) first convert to Proof (US), i.e. x Vol. by 2. Then see US Gauging Manual - Table 6. 190 Proof is 95% (vol.) Ethanol and 6.18% (vol.) H20. 170 Proof is 85% (vol.) Ethanol and 17.46% (vol.) H20. Ratio: 95/85 = 1.1176471*--then-- 17.46% (vol. water in 85% vol/vol alcohol water mixture) x 1.1176471* = 19.514118* Next: 19.514118* - 6.18 = 13.33; Dilution is now 100 Units [e.g., gallons, mL. etc.] of the initial alcohol solution to 13.33 Units of water. *[Significant figures not accounted for.] Prepared by Gary Spedding