ETH Unit Converter — Wei, Gwei & Ether, BigInt-Safe No Rounding
Convert between Wei, Gwei, Ether, Szabo, Finney and more. BigInt-safe — no rounding errors.
How to use
- 1 Type a number in any unit field — the other rows convert instantly.
- 2 Use the quick chips for common cases (1 ETH, 20 Gwei gas price, 21000 Wei base gas).
- 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.
What is ETH Unit Converter?
An ETH Unit Converter is a tool that converts amounts between Ethereum denominations such as Wei, Gwei, Szabo, Finney, and Ether. It performs the conversions using BigInt arithmetic to avoid floating-point rounding errors, keeping large integer values exact. The conversions run entirely client-side in the browser, with no data sent to a server.
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.
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