Converter Tools
Ethereum Unit Converter
Convert between Ethereum units (wei, kwei, mwei, gwei, szabo, finney, ether) instantly in your browser. BigInt-safe, no signup, no upload.
Quick presets
From unit
Decimal places
Show units
Most readable
Auto unit
1 ETH
Raw wei (hex)
0xde0b6b3a7640000
Conversion results
Every unit derived from your source value. Source unit is highlighted.
Converted
Wei
1000000000000000000 wei
1 wei = 10^0 wei
Converted
Kwei
1000000000000000 kwei
1 kwei = 10^3 wei
Also: babbage, femtoether
Converted
Mwei
1000000000000 mwei
1 mwei = 10^6 wei
Also: lovelace, picoether
Converted
Gwei
1000000000 gwei
1 gwei = 10^9 wei
Also: shannon, nanoether, nano
Converted
Szabo
1000000 szabo
1 szabo = 10^12 wei
Also: microether, micro
Converted
Finney
1000 finney
1 finney = 10^15 wei
Also: milliether, milli
Source
Ether
1 ETH
1 ETH = 10^18 wei
Also: eth
Ethereum units, in plain English
- Ethereum smart contracts and the EVM count balances in whole wei. One ether equals 10^18 wei, so wallets and explorers usually display ether for readability.
- Gas prices and gas fees are quoted in gwei (10^9 wei). A transaction at 30 gwei priced for 21,000 units of gas costs 30 * 21000 * 10^9 wei, or 0.00063 ETH.
- The middle units (kwei, mwei, szabo, finney) appear in older tutorials, geth output, and some Solidity examples. They are the same conversion, just at different exponents of ten.
- All arithmetic here uses native BigInt, so values up to 2^256 - 1 convert exactly with no floating-point drift.
How to use
- Pick a source unit (ether, gwei, wei, or any other denomination).
- Type an amount in the source unit. You can also include the unit inline, like "30 gwei" or "1.5 eth".
- Read every other denomination in the result grid, the auto-picked most readable unit, and the raw hex wei value.
- Use the decimal-place toggle to control rounding and click Copy on any card to grab the value.
About this tool
Ethereum Unit Converter resolves any amount between every standard Ethereum denomination in your browser: wei, kwei (babbage), mwei (lovelace), gwei (shannon), szabo, finney, ether, and the rarely used kether, mether, gether, and tether. Type a value in any unit, optionally including an inline suffix like "1.5 ether" or "30 gwei", and every other unit updates instantly. Math runs on native BigInt, so wallet balances, gas costs, and integer wei values up to 2^256 - 1 convert exactly with no floating-point drift. The most readable unit is highlighted automatically, the raw integer is also shown as a 0x-prefixed hex string for direct paste into RPC calls or contract ABIs, and every result has a one-click copy button with adjustable decimal places (0, 4, 9, 12, or 18). Use it to translate gas prices between gwei and wei, sanity check a transaction value reported in wei by a block explorer, prepare contract constructor arguments, compare gwei tips to ether totals when reviewing a transaction receipt, teach a Solidity unit lesson, or just answer the classic "how many wei is 0.1 ETH" question without firing up a Python REPL. Inputs accept decimal points or commas, thousands separators with spaces or underscores, and scientific notation like 1e18. The tool is entirely local: amounts you type, transaction values, and contract constants never leave your device.
Free to use. Works in your browser. No signup, no login.
Related tools
You may also like
Number Base Converter
Binary, octal, decimal, hex, and custom-base conversion with two's complement.
Open tool
ConverterData Size Converter
Convert between bytes, KB, MB, GB, TB and binary KiB, MiB, GiB with both unit systems shown.
Open tool
ConverterHex to Text Converter
Bidirectional hex and text converter with UTF-8 bytes and a hex dump view.
Open tool
ConverterScientific Notation Converter
Convert between scientific, E, engineering, and decimal forms with a precision slider.
Open tool
DeveloperGPT Token Counter
Estimate GPT tokens, context window usage, and OpenAI API cost.
Open tool