A year has 52 weeks, a week has 40 billable hours. So say a developer’s yearly salary is X$. Can you do X$/(52 * 40) to come to an hourly rate. Hell no.
You need to factor in
- Downtime when you are looking for clients
- Cost of infrastructure like servers, desktop and office space
- Vacations
- Insurance
A good rule of thumb is to take an yearly salary and divide that by 1000.
Of course many clients are going to ask for a fixed pricing. If you are comfortable with the client and specifications are well defined, you should provide a fixed quote.
Breakdown the specs in smaller unit of work. (Not larger than a day and then estimate the amount of work in hours. Multiply that by your hourly rate and add 20% margin as a contingency.) This should give you a guideline to do a fixed rate quote.
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