How to correctly calculate the cost of the project?

Question

Freelance

Good day.
The crux of the matter is as follows.
I'm starting to get used to freelance exchanges. Now I take on any job and for almost any price, due to the lack of any portfolio. But in the future, when creating a rating and a portfolio, it will be necessary to determine the price of your work more correctly, and for me this is some kind of problem.
Tell me how to correctly determine the cost of a project, work, or just do an hour of your work.
Perhaps there are articles or some other information on this topic.
I will be grateful for all answers.
Thank you.

Answer 1

come up with a number in your head, think about whether you will do this work for this number, if not, increase until you change your mind

summaUSD = X
happy = true

if  summaUSD >= happy
profit

The magic formula will always help :)

Answer 2

What is there to think about? :)
Take the number of working hours per month. Take your desired salary. Divide it by the number of hours. Adjust for experience/portfolio.
When taking an order: estimate the term of work, multiply by your price. You make adjustments for force majeure and the purchase of various gadgets. Get the final price of the project.

Answer 3

Practice evaluating on current projects, you probably understand what prices for them would be adequate.