Some people have higher tolerances than others, so the answer really depends on how it affects you. For me, 1 gram of kief or hash of a quality strain is about 10 strong doses or 20 medium doses. One gram of good kief, properly prepared, would get me high for several days straight.
I've also found that properly prepared edibles have a much stronger effect than I'd get from smoking the same amount. Smoking has always been inefficient compared to vaporizing or eating the same amount.
Just for reference, I've found the opposite to be true. I can smoke 1/4 gram of keif and be loaded, but 1/4 gram in a cookie wouldn't garner an effect at all.