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/ Contract Size Calculator

Contract Bytecode (Hex)

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Contract Size Calculator

Calculate contract bytecode size and check against 24KB limit

■ 01

What is the 24KB limit?

EIP-170, implemented in the Spurious Dragon hard fork, limits smart contract bytecode size to 24,576 bytes (24 KB). This limit prevents DoS attacks and ensures network stability. Contracts exceeding this limit will fail…

■ 02

How does it work?

Contract size is measured in bytes of deployed bytecode. Each pair of hexadecimal characters represents one byte. The size includes compiled Solidity code, constructor logic, and metadata. The tool divides hex string le…

■ 03

Sample Cases

Covers OpenZeppelin ERC-20 (USDC-like), Uniswap V2 Pair contract, and Aave LendingPool (Proxy Pattern) so you can compare common inputs and outputs quickly.

/ Code

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/ Integration

Source code from the selected tool, shown here alongside the live version on the right.

/ Source Code

TypeScript

typescript

// No external packages needed - pure Node.js/TypeScript

interface SizeResult {
  bytes: number;
  kilobytes: number;
  percentage: number;
  status: 'safe' | 'warning' | 'danger';
  remainingBytes: number;
}