Abdul,
Since nobody has responded to your question, I'll suggest a couple of simpleminded approaches, depending on how accurate a result you require: 1. Take the average row size being inserted and multiply that by the number of rows. There is probably a small amount of overhead that wouldn't be accounted for. 2. On a test server, load a sample of data and see how many log files are generated. The greater amount of data, the more accurate the result.