Z

ETH Unit Converter

Convert between Wei, Gwei, Ether, Szabo, Finney and more. BigInt-safe — no rounding errors.

Free No signup Client-side Privacy friendly
Quick:

How to use

  1. 1 Type a number in any unit field — the other rows convert instantly.
  2. 2 Use the quick chips for common cases (1 ETH, 20 Gwei gas price, 21000 Wei base gas).
  3. 3 Click the copy icon next to any unit to copy its value.

Why use this tool

  • BigInt-safe — Wei numbers stay precise even with the full 18 decimals.
  • Covers every Ethereum denomination: Wei, Kwei, Mwei, Gwei, Szabo, Finney, Ether.
  • Useful when reading gas estimates, RPC logs, or contract values that come in raw Wei.
  • Pure client-side — no rounding errors from JS floating point.

Frequently asked questions

Why use BigInt instead of normal numbers?

1 ETH = 10¹⁸ Wei, which exceeds the safe-integer range of JavaScript numbers (~9 × 10¹⁵). BigInt handles arbitrary precision without rounding errors.

What is Gwei used for?

Gas prices on Ethereum are quoted in Gwei (10⁹ Wei). A "20 Gwei" gas price means each unit of gas costs 0.00000002 ETH.

Does this work for other EVM chains?

Yes — BSC, Polygon, Arbitrum, Optimism, Avalanche, and other EVM chains all use the same Wei/Gwei/Ether unit system.

What is Szabo / Finney?

Historical names — Szabo (10¹² Wei) is named after Nick Szabo (digital contracts pioneer). Finney (10¹⁵ Wei) is named after Hal Finney (early Bitcoin contributor). Rarely used today but still appear in legacy docs.

Summary

ETH Unit Converter is a free web3 utility by Zerethon Tools. Convert between Wei, Gwei, Ether, Szabo, Finney and more. BigInt-safe — no rounding errors. Runs entirely in the browser — no signup, no upload.

Category
Web3
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. ETH Unit Converter runs entirely client-side — no server upload, no logging, no tracking of your input.

Related tools

NFT Metadata Validator

Validate NFT metadata against ERC-721, OpenSea, and Solana Metaplex standards. Preview your NFT before minting.

Open tool

Wallet Address Validator

Validate Ethereum, Bitcoin (legacy + SegWit), Solana, TRON and Litecoin addresses. Format + checksum, no RPC.

Open tool

EIP-55 Checksum Tool

Convert any Ethereum address to its canonical EIP-55 checksummed form. Detect typos before sending funds.

Open tool

Keccak-256 Hash Generator

Compute Keccak-256 digest (Ethereum's hash) of text or files. Different from SHA-3 — matches Solidity keccak256().

Open tool

Build, share, and grow on Zerethon Social

Free signup. Earn points, collect achievements, and connect with creators worldwide.

Try Zerethon free