Bitcoin Mining Pool Distribution Tracker

Which mining pools found Bitcoin's blocks over the past 24 hours to 3 years, each pool's share and estimated hashrate, and the Nakamoto coefficient.

The Nakamoto coefficient is the fewest pools that together control more than 50% of hashrate. The lower it is, the more concentrated mining is.

#	Pool	Share	Blocks	Est. hashrate
1	Foundry USA	26.5%	276	263 EH/s
2	AntPool	20.4%	213	203 EH/s
3	F2Pool	15.6%	163	156 EH/s
↑ These 3 pools mined over half of all blocks
4	ViaBTC	9.1%	95	91 EH/s
5	SpiderPool	6.7%	70	67 EH/s
6	MARA Pool	5.3%	55	53 EH/s
7	SECPOOL	4.6%	48	46 EH/s
8	Luxor	3.9%	41	39 EH/s
9	OCEAN	3.0%	31	30 EH/s
10	Braiins Pool	1.5%	16	15 EH/s
11	Binance Pool	1.2%	12	11 EH/s
–	Unidentified miners	0.8%	8	7.6 EH/s
12	BTC.com	0.7%	7	6.7 EH/s
13	Poolin	0.4%	4	3.8 EH/s
14	WhitePool	0.4%	4	3.8 EH/s

Based on 1,043 blocks mined in the past week. Network hashrate now: 996 EH/s.

Short windows hold few blocks (about 144 a day), so luck alone can move a pool's share by several points. Pick a longer window for a steadier read.

Pool block data from mempool.space.

Every calculator here runs on formulas verified against primary sources and is reviewed before it ships.

Learn about our methodology →

Built and reviewed by

Fabio Arcieri

Last reviewed: October 2026

How to read the output

Nakamoto coefficient — the headline count of pools that mined over half of the blocks in the selected window.
Share — the percentage of the window’s blocks a pool found.
Blocks — the number of blocks behind that share.
Est. hashrate — the pool’s share applied to the current network hashrate (itself inferred from block times), in exahashes per second (EH/s).
Unidentified miners — blocks mempool.space can’t attribute to a pool.

What are mining pools

A mining pool is a group of miners who combine their hashrate, the computing power they spend searching for blocks, and split the rewards in proportion to the work each contributes.

Pooling turns rare rewards into regular payouts. A solo miner with a small share of the network may wait years for one block, while a large pool finds blocks every day.

How pool shares are estimated

Pool shares are counted from blocks found, not measured from hardware. Pools don’t publish verifiable hashrate, so mempool.space attributes each block to a pool by its coinbase tag (a signature in the block’s first transaction) and payout address.

Short windows are noisy. A day holds about 144 blocks, so luck alone typically moves a 30% pool’s daily share by about 4 points. Longer windows are steadier but lag, because a pool that recently grew or shrank looks closer to its old size.

What is the Nakamoto coefficient

The Nakamoto coefficient is the fewest pools that together control more than 50% of the hashrate. The lower it is, the more concentrated mining is.

This tracker counts it from block share in the selected window. Unidentified blocks stay in the total but never count as a pool.

Is Bitcoin mining centralized?

Block production is concentrated in a few pools, and that concentration carries a real risk. A pool holding a majority of hashrate could mount a 51% attack: rewrite recent blocks to double-spend its own coins and censor other transactions. It still couldn’t spend coins it doesn’t own or change the consensus rules.

Pools don’t own the hashrate, though. Miners point their machines at a pool and can switch at any time, so a pool keeps its share only while miners choose to stay. Compare the 24H and 3Y windows to tell a short-term swing from a lasting trend.