How to know how much i am worth?

Yes, part of value is confidence.

But there are markets.

I'll use examples from another industry I know, so nobody feels I have something against them.

In the real estate appraisal industry, there are sections of employers that pay little, sections that pay average, sections that pay a lot.

There are appraisers who are quite confident that they're worth more than $250. for a basic appraisal, but they're competing and screaming in the mortgage/appraisal management company market, the lowest paying one... where most appraisers work.

You need to know what your market bears and have confidence to ask for what you think you're worth.

I suppose not competing outside the mortgage/appraisal management company market can be assigned to lack of confidence. Though I usually just place it in the accurate thinking and accurate market analysis part of my world.

I keep suggesting to people asking how much they're efforts are worth to experiment a little with raising prices, looking for different clients and, of course, look at how much they're charging in relation to how much what they deliver ends up earning (money or otherwise) to the client.

But the last part tends to get me in trouble as people don't seem to accurately assess... They say things like: a mortgage broker makes $5k on one loan, if I bring him/her 10 extra loans, I'm bringing him $50000. 5% of that is $2500. If my copy brings them 10 new clients month after month, I'm worth $2500 each month for months on end, or a lump sum of $100,000.

They forget, in other words, that gross revenue is not the best way to look at value from the client's point of view. And that the client has additional expenses marketing the copy... for months on end. That the real value to the mortgage broker is not $2500 but more like $500 to $800 for the first 10 extra sales.

Rick is right: if the client tells you $1 you bring in is worth $0.08 to me, that's what it's worth to that client. But value is when the seller and buyer agree on it.

So, we're back to: what do you think you're worth and how much can you actually get paid for what you do? When those are the same, you've arrived at the answer to How much am I worth.

I have, right now, 2 prospects. They want the same thing. One wants me to accept 1% of gross; the other one 1.5% of gross. They're in different industries, so 1% of gross per average sale for client #1 is $70; 1.5% for the 2nd one's average sale is $240. My time in, effort and required skills, in other words, are the same but the per-sale amount is vastly different.

At this point we have to consider how good their closing people are... At this point, based on what they say, it's the same... At this point, I have to say yes to prospect #2 and no to prospect #1.

A while back I'd have said yes to both... because I have 24 hours in the day and many were left empty of income-producing activities. Now, not only do I not have empty hours but all my hours now bring in more than what prospect #1's offer would.

All that to just say that what you're worth is fluid, changes over time. Stay on top of that change and you're better off.

PS My notions of value have been permanently 'damaged' by the market value for real estate appraisers:
The most probable price, as of a specified date, in cash, or in terms equivalent to cash, or in other precisely revealed terms, for which the specified property rights should sell after reasonable exposure in a competitive market under all conditions requisite to a fair sale, with the buyer and seller each acting prudently, knowledgeably, and for self-interest, and assuming that neither is under undue duress.