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What Is Mining Difficulty? How It Adjusts & Why It Matters
Mining difficulty is a number that sets how hard it is to find a valid block on a proof-of-work chain; the network raises or lowers it automatically to keep the average time between blocks close to its target.
Key takeaways
- Higher difficulty means more hashes are needed on average to find a block.
- The network adjusts difficulty automatically based on how quickly recent blocks were found.
- When network hashrate rises, difficulty follows, and each miner's share of rewards shrinks.
- Profitability calculators must use current difficulty (or the network hashrate it implies).
What difficulty is
Every block must have a hash below a target. Difficulty is the inverse of that target: the smaller the target, the higher the difficulty, and the more hashing it takes on average to find a valid block. It exists so blocks arrive at a steady pace regardless of how much mining power joins or leaves.
How it adjusts
Each chain has its own rule. Bitcoin retargets every 2,016 blocks, and Litecoin uses the same scheme scaled to its faster blocks, while Dogecoin adjusts continuously based on recent block times. If blocks have been arriving faster than target, difficulty increases; if slower, it decreases.
Difficulty, hashrate and rewards
Network hashrate and difficulty move together over time. If more miners join, blocks come faster, difficulty rises, and the same block rewards are split among more hashing power — so each miner's expected earnings fall unless the coin's price rises.
What it means for your mining
- Rising difficulty with a flat price lowers profitability
- Falling difficulty (miners leaving) can raise it
- Hardware that's profitable today may not be after several adjustments, or after a halving cuts the reward
Using difficulty in estimates
Difficulty (or the equivalent network hashrate) is a required input for any profitability estimate, and it changes continuously — so estimates are snapshots, not forecasts.
Difficulty in merged mining
When several chains are merge-mined, each has its own difficulty, and your hashrate is compared against each one separately. A rise in one chain's difficulty lowers your expected rewards on that chain only. That's why estimates for merged mining are calculated coin by coin and then added together, instead of using a single network figure.
Example
Blocks on a chain have been arriving 20% faster than target for a period. At the next adjustment the network raises difficulty so the average block time returns to target — and every miner's expected share of rewards drops accordingly.
Put it into practice
See live difficulty and what it means for you
The Scrypt mining calculator shows current network hashrate, difficulty and recent block rewards for Litecoin, Dogecoin and Luckycoin, and estimates your earnings from your own hashrate and power costs.
Open the mining calculator Get Scrypt for AndroidFrequently asked questions
Does higher difficulty mean fewer coins are created?
No. Difficulty keeps the block interval steady, so issuance per unit time is set by block reward and block time, not by difficulty.
How often does difficulty change?
It depends on the coin: some adjust every block and others after a fixed number of blocks, as Bitcoin and Litecoin do.
Where can I see current difficulty?
The Scrypt mining calculator's coin pages show current network hashrate, difficulty and recent miner rewards.
Written by the Scrypt Wallet team · Updated 2026-09-29. General education, not financial, tax or legal advice.