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I think that Sheela is referring to the micro-pore surface area, not just the bulk macro surface area. 
 
I think that it may be done by electrolysis experimentation, in a salt water bath. If you have a smooth, solid graphite electrode, then you know the actual surface area. If you have two of these and can push a current from one electrode to another at a fixed voltage, such as 5V, and measure the current that will pass through the salt water electrolyte, then I think that you have a good basis for a relative surface area measurement. You can experiment with putting more or less of the smooth graphite electrode into the salt water bath, and create a curve of results for the case of the smooth electrodes. Then, you can proceed to more difficult case of the carbon cloth or other microporous material. You can submerse and wet down, for example, 10 square centimeters of the carbon cloth, and read the amount of current that will then pass through to the counter electrode. Then interpolate

"the surface area of graphite felt?" did u use carbon cloth? 
u can easily calculate the surface which was immersed in the cell by just finding it's length, width or depth (if there). if u made any pore there u have to substract that from total area. 
thanks

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