Whoever has Doubt about the Number of Circuits of Tawaf, he bases his Decision on whatever he is certain of

Question :

During the past Ramadhan I performed the rites of "Umrah, but at the end of the Tawaf, I was afflicted with doubt concerning the number of circuits I had done - was it six or seven? Due to fear of being deficient in the number of circuits and to cut off the doubt, I made an extra circuit of Tawaf. I do not know was this act of mine correct or not. Is there any sin on me for that?

Answer:

You did well in that and this is what is obligatory on you. For verily, what is obligatory on whoever has doubt concerning the number of circuits of Tawaf or Sa'y is to base his decision on what he is certain of, and that is the least number. This is like if a person doubts in the prayer as to whether he prayed three or four Rak'ahs. He bases his decision on what he is certain of, which is the least number, and he performs the fourth Rak'ah and makes the prostration for forgetfulness. He does this if he is leading others in prayer or praying alone. However, if he is being led in prayer, then he follows the person who is leading him. Likewise is the case with Tawaf and Say. If the person performing Tawaf doubts as to whether he made six circuits or seven, he bases his decision on what he is certain of, which is the least number, and he performs the seventh circuit and there is no sin on him. And Allâh is the Giver of success.

Source:
Ash-Shaykh Ibn Baz
Fatawa Islamiyah, Vol. 4 Page 183