ETH Unit Converter
Convert Wei, Gwei, and Ether with exact precision, then estimate Ethereum gas fees. Free ETH unit calculator — no rounding errors or sign-up.
Choose a preset or edit any unit below. Commas are accepted.
Wei, Gwei & Ether
Editing Ether; all results update with exact BigInt precision.
1,000,000,000,000,000,000
1,000,000,000
More Ethereum denominationsKwei, Mwei, Szabo & Finney
1,000,000,000,000,000
1,000,000,000,000
1,000,000
Ethereum gas fee estimator
Gas limit × max gas price. Your wallet's final fee may be lower.
Maximum fee
0.00042 ETH
Exact Wei
420,000,000,000,000
Conversion happens entirely in your browser. Never enter a private key, seed phrase, or wallet recovery phrase into any website.
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Frequently asked questions
What is ETH Unit Converter?+
Convert between Wei, Kwei, Mwei, Gwei, Szabo, Finney, and Ether instantly — every field stays in sync as you type.
How do I use ETH Unit Converter?+
Uses BigInt arithmetic, not floating-point, so large values (like 1 ETH = 1,000,000,000,000,000,000 Wei) are always exact. Common ETH and Gwei presets, readable grouped values, denomination aliases, and one-click copying. Built-in gas fee estimator multiplies gas limit by max gas price without rounding. Useful for reading gas estimates, RPC logs, and contract values that come back in raw Wei. Runs entirely in your browser — never paste a private key or seed phrase into this or any online tool
Is ETH Unit Converter free?+
Yes, ETH Unit Converter is completely free. No account or sign-up required, and all processing happens in your browser — nothing is sent to a server.
Is my data safe when I use ETH Unit Converter?+
Yes. ETH Unit Converter runs entirely in your browser using JavaScript and Web APIs — your input is never uploaded, transmitted, or stored on any server.