A 9 inch x 9 inch pan.....cut the brownies into 1 inch x 1 inch pieces... gives you 9 doses per batch...about .75g per person.....30 is like .20g per person

If you have a low tolerance then cut it into 18 pieces (1/2 inch x 1/2 inch) about .45g per person

Remember eating as not the same as smoking...you think your not high and then 2 hours later your wipedout.....It takes atleast 1 hour to start feeling the effects of eating MJ