Is it possible to make $.100 per month by mining cryptocurrency on PC or Laptop
The decimal point was probably a typo but unfortunately it's much closer to the truth than the other number. If anything $0.10 per month or 1/3 of a cent a day - even that is much more than one could earn from mining bitcoins on a PC (let alone - on a laptop).
The block difficulty is now at 15 trillions. That means - you need 15 trillion KiloHash per second (or 15 PetaHash per second) to mine BTC 0.25 per day. (And it's going to be BTC 0.125 in just 3 months, as the block reward is to be halved again.)
Now, a typical CPU has the "hashing" power in tens of KiloHashes. A GPU can give you hundreds of KiloHashes. Let's assume you have a PC with some super duper GPU that can give you 1.5Mh/s. How much can you mine with it?
Let's calculate: Hashing power (1500Kh/s) divided by the block difficulty (15 trillion KiloHash), divided by 4 (as the block reward has already been halved twice), that amounts to 0.000,000,000,025 BTC a day. In other words:
- You will never be able to mine a block on your own
- If you join a pool, your contribution towards the mined block will be so negligible, that you won't get anything. (The smallest bitcoin amount is 1 satoshi or 0.000,000,01)
So here is your answer. Nobody can mine bitcoins on a PC, let alone a laptop. And, if you think about getting a miner, make sure you do some number crunching first or else your bitcoins may not even pay for all the power consumed by your miner - let alone for what it cost to purchase and deliver the miner itself.
Ok it's not possible or profitable to mine top cryptocurrencies like bitcoin and ethereum
But what you think about other cryptocurrencies out there ?
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Try looking for ASIC-proof crypto-currencies; those where it's not (yet) possible to imitate proof of work with special computing devices designed specifically for mining. The ones I know of are Primecoin and Monero. Both have been around long enough for the difficulty to climb through the roof and, as far as I know, both have been "cracked" to allow GPU mining. Thus laptop users are out, but PC users with a decent video card can still get earn a few pennies. Not much to really get rich (perhaps - hardly enough to pay the power bills) but if you already have a PC and use it anyway for your day to day stuff, then you might as well have the mining app running in the background, whatever it mines - is all yours.