ETH to Wei & Gwei Converter: Exact Ethereum Units
Convert ETH, gwei and wei with exact integer arithmetic.
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Manual inputs · Educational estimates · No live prices
How this tool works
1 ETH = 1,000,000,000 gwei = 1,000,000,000,000,000,000 wei.
A worked example
0.000000001 ETH is exactly 1 gwei, or 1,000,000,000 wei.
Assumptions & limits
Accepts plain decimal notation only. Values smaller than one wei are rejected instead of rounded. No fiat price is used.
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Explore our crypto guides ↗ETH to Wei & Gwei Converter: Exact Ethereum Units
One ether equals 1,000,000,000 gwei and 1,000,000,000,000,000,000 wei. Wei is the smallest integer unit used for ether amounts, while gwei is commonly used for gas prices. This converter preserves up to 18 decimal places of ETH and does not round away a single wei.
How to use this tool
- Enter an amount in plain decimal notation without commas or scientific notation.
- Select ETH, gwei or wei as the input unit.
- Calculate the exact equivalent in every unit. Use a whole number of wei; smaller fractions are not supported.
Frequently asked questions
How many wei are in one ETH?
One ETH equals 10^18 wei, written as 1,000,000,000,000,000,000. One gwei equals 1,000,000,000 wei, and one ETH equals 1,000,000,000 gwei.
Is gwei a separate cryptocurrency?
No. Gwei is a denomination of ether, just as cents are a denomination of a dollar. It is commonly used to express the price paid per unit of gas on Ethereum.
Why use exact integer conversion for wei?
Ordinary floating-point numbers cannot preserve every integer across the full range of typical wei amounts. This tool parses decimal strings into integers so the output retains exact atomic units.