Paste Asana tasks in text area then click calculate
Asana's 'hack' feature that enabled you to add up numbers contained in square brackets was recently removed by Asana to encourage use of Custom Fields, which is a premium feature. This doesn't suit freelancers like me because Asana premium is for 5 members or more with a price tag to match, so I created my own hack that does the same thing. It's a little more effort (copy and paste) but allows me to continue using Asana and not change my workflow. Feel free to use and share.