In order to convert cubic feet into metric tonnes, you can make use of one of the very useful online convertors available free of charge on the internet. A link to one of these conversion sites can be found on this website, although there are a huge number of other sites you could choose from too:
www.metric-conversions.org/volume/cubic-feet-to-cubic-meters After entering the amount of cubic feet, you will then be able to click on the 'convert' button to find out what the metric tonne equivalent is.
There is a much easier way of finding out the capacity in metric tonnes, though. Take all the initial reading in feet using a measuring tape or stick. To find the volume of the tank, all you need to do is take a reading for the length, width and height of the storage facility. Next use the following formula to find the volume:
Volume = height x width x length.
This will then give you a final figure in cubic feet for the volume of the tank. To convert this into metric tonnes, simply take this final figure and put it into the online convertor calculator to find the answer you are looking for.