Silica Gel Volume Calculator

This tool calculates the weight of silica gel required to maintain a microclimate in your environment.

To use, simply choose English or SI units, and enter the following:
1 - The volume of the case
2 - The anticipated difference between the desired case humidity and the average ambient humidity
3 - The exchange rate for the case (# exchanges per day)
4 - The minimum time period (in days) before the gel will need to be maintained
5 - The maximum allowable deviation from the target RH%

English Units:
Volume of case (cubic feet)
Differential RH%
Exchange rate/day
Days between maintenance
Tolerance in target RH
Gel Required in Pounds
SI units:
Volume of case (cubic meters)
Differential RH%
Exchange rate/day
Days between maintenance
Tolerance in target RH
Gel Required in Kilograms

How can I recondition my Silica Gel?
Silica gel can be reconditioned by adding moisture to it, if it is too dry or by mixing it with bone dry silica gel, if it is too moist. The calculator below shows how much water or dry gel you need to add. The dry gel can either be new unconditioned gel or used gel that has been dried in an oven at 240°F (115°C) overnight. Brownell Ltd. can provide equipment for easily reconditioning gel in either small or large quantities.

Never add liquid water directly to silica gel. Use only properly designed reconditioning equipment.

To use, simply enter the following:
1 - The beginning weight (in grams) of the gel to be re-conditioned
2 - The beginning RH% of the gel to be re-conditioned
3 - The desired RH% of the gel once re-conditioned

Beginning weight of gel (grams)
Beginning RH% of gel
Desired RH% of gel
Amount of water to add (grams)
Amount of dry gel to add (grams)