Wei / Gwei / ETH Converter
Convert between Wei, Gwei, and ETH — the three most common Ethereum unit denominations.
How to use this tool
- Enter an amount in Wei.
- Read the equivalent value in Gwei and ETH.
Ethereum uses three main denominations: Wei (smallest), Gwei (used for gas prices), and ETH. 1 ETH = 10^9 Gwei = 10^18 Wei.
⚠ This tool provides general estimates for education only and is not financial, tax or legal advice. Figures may not reflect your situation — verify with a qualified professional.
Formula
Gwei = Wei ÷ 109
ETH = Wei ÷ 1018
How it works
This tool converts a raw Wei amount into the two higher Ethereum denominations by dividing by the appropriate power of ten: 109 for Gwei and 1018 for ETH. Wei is the smallest indivisible unit of Ether, so all conversions are exact integer-ratio divisions with no rounding assumptions. Results may display as very small decimals when Wei amounts are modest.
Worked example
- Start with 1,000,000,000 Wei (1 × 10⁹ Wei).
- Convert to Gwei: 1,000,000,000 ÷ 10⁹ = 1 Gwei.
- Convert to ETH: 1,000,000,000 ÷ 10¹⁸ = 0.000000001 ETH.
1,000,000,000 Wei = 1 Gwei = 0.000000001 ETH (1 × 10⁻⁹ ETH)
Common mistakes to avoid
- Confusing Gwei (109 Wei) with ETH (1018 Wei) when setting gas prices, causing transactions to underpay by a factor of a billion.
- Entering a gas price in Wei when the wallet UI expects Gwei, resulting in near-zero fees and stuck transactions.
- Forgetting that ETH values in smart-contract calls are always denominated in Wei, so passing 1 instead of 1000000000000000000 sends a millionth of a cent.
Key terms
- Wei
- The smallest denomination of Ether; one ETH equals 10¹⁸ Wei.
- Gwei
- Gigawei — 10⁹ Wei. Commonly used to express Ethereum gas prices.
- ETH
- Ether, the native currency of the Ethereum network; equal to 10¹⁸ Wei.
- Gas price
- The fee per unit of computation on Ethereum, typically quoted in Gwei.
- Denomination
- A named unit within a currency system; Ethereum uses Wei, Kwei, Mwei, Gwei, and ETH, among others.
Frequently asked questions
- What is Wei?
- Wei is the smallest denomination of Ether (ETH), analogous to Satoshis in Bitcoin. 1 ETH = 1,000,000,000,000,000,000 Wei (10^18).
- What is Gwei used for?
- Gwei (gigawei) is the standard unit for Ethereum gas prices. Gas prices are typically quoted in Gwei; e.g. a gas price of 20 Gwei = 20,000,000,000 Wei.