Ethereum Unit Converter

Convert between Wei, Gwei, Ether, Szabo, Finney and all EVM units precisely. Calculate gas costs from transaction parameters. Free dev tool, instant.

Unit	Name	Value
Wei	10⁰
Kwei	Babbage (10³)
Mwei	Lovelace (10⁶)
Gwei	Shannon (10⁹)
Microether	Szabo (10¹²)
Milliether	Finney (10¹⁵)
Ether	ETH (10¹⁸)
Kether	Grand (10²¹)
Mether	10²⁴
Gether	10²⁷
Tether	10³⁰

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What is Ethereum Unit Converter?

Ethereum Unit Converter helps you convert between different denominations of Ethereum (ETH). The smallest unit is Wei, and the most common units are Gwei (used for gas prices) and Ether (the main currency unit).

This tool is essential for anyone working with Ethereum transactions, smart contracts, or calculating gas fees.

Ethereum Units Explained

Unit	Value in Wei	Common Use
Wei	1	Smallest unit
Kwei (Babbage)	10³ (1,000)	Technical calculations
Mwei (Lovelace)	10⁶ (1,000,000)	Technical calculations
Gwei (Shannon)	10⁹ (1,000,000,000)	Gas prices
Microether (Szabo)	10¹² (1,000,000,000,000)	Small payments
Milliether (Finney)	10¹⁵	Medium payments
Ether	10¹⁸	Main currency unit
Kether (Grand)	10²¹	Large amounts
Mether	10²⁴	Very large amounts
Gether	10²⁷	Extremely large amounts
Tether	10³⁰	Theoretical maximum

What is Wei in Ethereum?

Wei is the smallest denomination of Ether, named after Wei Dai, a cryptographer. 1 Ether = 1,000,000,000,000,000,000 Wei (10¹⁸ Wei).

What is Gwei and why is it important?

Gwei (Gigawei or Shannon) is commonly used to denote gas prices on Ethereum. 1 Gwei = 1,000,000,000 Wei (10⁹). Gas prices are typically displayed in Gwei because it provides a convenient middle ground between Wei and Ether.

How do I calculate gas fees?

Gas fees are calculated by multiplying gas used by gas price (in Gwei). For example: 21,000 gas × 50 Gwei = 1,050,000 Gwei = 0.00105 ETH. This converter helps you convert between these units easily.

Ethereum Unit Converter — Convert between Wei, Gwei, Ether, Szabo, Finney and all EVM units precisely. Calculate gas costs from transaction parame — **Ethereum Unit Converter**

Why are Ethereum units named after people?

Many Ethereum units are named after pioneers in cryptography and computer science: Wei Dai (Wei), Charles Babbage (Kwei), Ada Lovelace (Mwei), Claude Shannon (Gwei), Nick Szabo (Szabo), and Hal Finney (Finney).

Why do gas calculations need BigNumber arithmetic instead of normal floats?

1 ETH = 10^18 Wei, far exceeding JavaScript Number precision (Number.MAX_SAFE_INTEGER = 2^53 - 1 = ~9*10^15). Computing 50 Gwei * 21000 gas as floats loses precision. This converter uses BigInt or BigNumber.js so 0.000000000000000001 ETH conversions stay exact.

What is the difference between gasUsed, gasPrice and gasLimit?

gasLimit is the MAX gas you authorize. gasPrice is what you pay per gas unit (in Gwei, post-EIP-1559 split into baseFee + priorityFee). gasUsed is what the EVM actually consumed. Your fee = gasUsed * effectiveGasPrice. Unused gasLimit is refunded automatically.

Are these unit names used on all EVM chains or only Ethereum?

Wei, Gwei and Ether terminology is shared across all EVM chains (Polygon, BSC, Arbitrum, Optimism, Base, Avalanche C-Chain). Native units differ in name (MATIC, BNB, AVAX) but the 1:10^18 base-unit ratio and Gwei gas-price convention apply identically.

Common Conversion Examples

1 Ether = 1,000,000,000 Gwei
50 Gwei = 0.00000005 Ether (typical gas price)
21,000 gas × 100 Gwei = 0.0021 ETH (standard transfer fee)
1 Gwei = 1,000,000,000 Wei