Topic: Calculating Dollar Per GH/s ... - page 2. (Read 3323 times)

Not quite...

difficulty * 2^32 / hashrate will give you how many seconds you would expect it to take to find a block.  The if you took 25 and divided by that number, you'd get how much BTC you'd expect to earn a second.  So, to calculate expected earnings per GH/s, this is the correct formula:
Therefore, at current difficulty, 1GH/s = 0.00000000031067BTC/s.  This, however, is not what the OP asked.  The original question was how to figure out a system's dollar per GH/s, which is simply the cost of the system divided by the hash rate of that system in GH/s.  So, if you paid $1000 for a 1TH/s miner, it's $1 per GH/s.

If you want to figure out operating costs, that's easy, too.  Just take the rated power consumption of the miner, translate into kw and multiply by the cost of your electricity per kWh like this:
So, at 10 cents per kWh, a 340 watt miner will cost $0.034 an hour to run, or $0.816 a day.  Now to figure out your expected earnings after you've factored in power, you simply take the first number 0.00000000031067 and multiply by 86400 (seconds in a day) to get 0.000026841888 (which is how much BTC 1GH/s expects to earn in a day).  Now, convert that to your fiat (I'll use a conversion ratio of 1BTC -> $590 USD) which is $0.01583671392 per day.  So, now that you know how much each GH/s will earn you in a day in USD, multiply the value by the GH/s of the miner and subtract out the daily power costs.

Of course, you could just use the formula I posted and give the appropriate hash rate there (instead of just calculating earnings for 1GH/s) like this (I'm using the Antminer S3 as an example):
Therefore, right now an Antminer S3 expects to make you $6.15 a day assuming $590 per BTC and $0.10 per kWh power costs.

Because there are variables, there is a formula. As always with these things. The formula for BTC per GH/s is

difficulty * 2^32 / hashrate

In order to get the money out of this you just convert the BTC to whatever currency it is

(difficulty * 2^32 / hashrate) / (BTC / currency )

Difficulty does not go up every week. Difficulty adjusts (can theoretically go down too) when 2016 Blocks are found which is approximately 10-14 days.

Please don't use bitcoinx.com. The defaults (in particular, "Profitability decline per year") are not reasonable and you will be fooled into thinking you will earn much more than you actually will.

you just go to this site and receive parameters of the device that you have
for example
Hash rate
Power consumption (W)
Time frame (months)
www.bitcoinx.com/profit

Actually you are right, that's basically how you would calculate the costs of buying that device. You have to factor in the costs of running it, though. They do consume a lot of electricity. If you manage to stay below $1/GH/s you're off in a way to reach a positive ROI if you're lucky.

If you're talking about what your expected return is per each GH/s mining power, it's about 2 cents (USD) per GH/s per day currently.
That will change next week when the difficulty goes up again, like it has every week. The exchange rate has been pretty stable at around $570-$600 per BTC.

The Antminer s3 costs about $600 and has a hash rate of 441 GH/s, so each GH/s costs about $1.36.

Do you also want to include operating costs, such as power?

Hello,

This is a dumb question for sure, but I can't find it anywhere.

How do I calculate the "dollar per GH/s" for a system?

I assumed I just divide the cost of the system by the hash rate but that doesn't seem right.

Thank you for your time.