I tried answering last night but the Board cut out at the critical moment. Try the following:
1. Taking into account no paid holidays, sick leave or super, and therefore thinking of the whole package, work out what you would like to earn for the year (without being silly...)
2. Divide this by 48 or 49 to allow for 4 (or 3) weeks' vacation. This is your weekly target
3. Work out your average weekly billable hours, and divide weekly by hours to get your hourly rate. Be conservative here. Most consultatnts assume about 75% billable hours. For corporates, raise this a bit. For small clients, drop it a bit.
Each year, based on your experience and the industry you are working in, revise.
Denis