# Ethereum Block time Methodology

## 1. Overview

Block time measures the average time interval between consecutive blocks on the Ethereum blockchain, expressed in milliseconds and aggregated daily. This metric provides insight into network performance, mining/validation efficiency, and blockchain throughput. The calculation determines how long it takes on average for new blocks to be produced each day by measuring the time difference between consecutive block timestamps and averaging these intervals across all blocks produced within each day.

## 2. Data sources

- **Ethereum blockchain block headers**: Raw block data from Ethereum nodes containing block timestamps, block numbers, and block metadata
- **Block timestamp data**: Precise timestamps indicating when each block was mined or validated on the Ethereum network
- **Block sequencing data**: Block numbers that provide the chronological ordering of blocks for time interval calculations

## 3. Step-by-step calculation

### Component A: Block data extraction
- **Purpose**: Retrieves fundamental block information from Ethereum blockchain data
- **Logic**: Extracts block timestamps and block numbers from raw Ethereum blockchain data. Applies type casting to ensure block numbers are integers and timestamps are in proper timestamp format. Excludes the genesis block (block number 0) because it has an artificial timestamp at the start of Unix time that would skew interval calculations.
- **Key fields**: `block_timestamp` (when the block was mined), `block_number` (sequential block identifier)

### Component B: Time series preparation  
- **Purpose**: Creates pairs of consecutive blocks to enable interval calculation
- **Logic**: Uses a LAG window function ordered by block number to retrieve the previous block's timestamp for each current block. This creates the necessary data pairs to calculate time intervals between consecutive blocks in the blockchain sequence.
- **Key fields**: `block_timestamp` (current block time), `previous_timestamp` (previous block time from LAG function), `block_number` (for ordering)

### Component C: Block interval calculation
- **Purpose**: Calculates the actual time intervals between consecutive blocks
- **Logic**: Computes the time difference between each block timestamp and its previous block timestamp using millisecond precision. Filters out the first block in the sequence since it has no previous timestamp. Truncates block timestamps to daily boundaries to prepare for daily aggregation.
- **Key fields**: `timestamp` (daily boundary), `block_time` (interval in milliseconds between consecutive blocks)

### Component D: Daily aggregation
- **Purpose**: Aggregates block intervals into daily average block times
- **Logic**: Groups block intervals by day and calculates the average block time across all blocks produced within each day. Adds standard metadata fields including chain identifier, market sector classification, and business segment categorization. Each day receives a single average block time value representing the typical interval between blocks for that day.
- **Key fields**: `timestamp` (daily boundary), `block_time` (average daily block time in milliseconds), `chain_id` (ethereum), `market_sector_id` (blockchains_l1)

### Final aggregation
- **Combining components**: Data flows sequentially from raw block extraction through time series preparation to interval calculation and finally daily averaging
- **Currency conversion**: Not applicable as block time is measured in milliseconds, not currency
- **Time aggregation**: Daily boundaries are created using timestamp truncation to the day level, with all blocks from each calendar day averaged together
- **Final calculation**: The final metric represents the average time in milliseconds between consecutive blocks for each day, providing a daily measure of Ethereum network block production speed

*This methodology was automatically generated by Token Terminal's methodology analyzer.*

avg(block_timestamp - previous_block_timestamp)

Block time

Ethereum

Validators process transactions and receive fees from users (supply-side fees).

Ethereum is a smart contract platform for decentralized applications (a blockchain). Ethereum was founded by Vitalik Buterin, Anthony Di Iorio, Mihai Alisie, etc. and launched in 2015.

ETH holders own and govern the protocol. They currently take a cut of the total transaction fees (base fee) paid by users (revenue). Ethereum’s investors include KR1, Block Ventures, 8 Decimal Capital, etc.

Ethereum ETH

Block time

Block time

Competitive landscape