Desiccant Calculation Chart

The desiccant calculation chart below is specifically for estimating how much clay or silica gel desiccant you need.  This does not apply to molecular sieve desiccant. Please note that a unit of desiccant refers to its drying capacity, not its volume. A unit (approximately one ounce) is the amount of desiccant that will absorb at least three grams of water vapor at 20% relative humidity and at least six grams of water vapor at 40% relative humidity at 77 degrees F (25 degrees C).

Container Size					Desiccant
Square Feet	Square Inches	Gallons	Cubic Feet	Cubic Inches	Units of Desiccant Required
0.1	15	1.1	0.14	237	1/6
0.2	30	2.1	0.28	476	1/3
0.3	45	3.2	0.42	714	1/2
0.6	90	6.2	0.83	1428	1
1.3	180	12.5	1.67	2856	2
1.9	270	18.7	2.50	4284	3
2.5	360	25.0	3.33	5712	4
3.1	450	31.2	4.16	7140	5
3.8	540	37.4	5.00	8568	6
4.4	630	43.6	5.83	9996	7
5.0	720	50.0	6.66	11424	8
5.6	810	56.1	7.50	12852	9
6.3	900	62.3	8.33	14280	10
7.5	1080	74.8	10.00	17136	12
8.8	1260	87.3	11.66	19992	14
10.0	1440	99.7	13.32	22850	16
20.0	2880	199.4	26.64	45700	32
50.0	7200	498.5	66.65	114250	80
100.0	14400	997.0	133.30	228500	160
120.0	18000	1240.0	166.00	285600	200
150.0	22500	1550.0	207.00	357000	250

  We supply desiccant bags, pouches, and packets ranging in size from 1/6 unit all the way up to 80 unit. Order by the pail or by the drum. We can even accommodate orders for bulk desiccant.  To place your order, please call 1-800-644-4032.