ETH Unit Converter

How to use the ETH unit converter

Type into any row

Enter a value into any of the seven unit rows (wei, kwei, mwei, gwei, szabo, finney, ether) and the others update instantly. The math uses native BigInt — no floating-point rounding errors, even at 18 decimal places.

See USD value (optional)

Type the current ETH price (USD) into the dark card on the right. The tool shows what your entered amount is worth in dollars. We don't fetch the price automatically — to keep the tool 100% client-side. Get the current ETH price from CoinGecko, Coinbase, or your wallet, and paste it in.

Calculate gas costs

The Gas cost calculator at the bottom multiplies gwei × gas units to show transaction cost in ETH and USD. Click a preset (21k for ETH transfer, 65k for ERC-20, 150k for Uniswap swap) and adjust the gwei to current network conditions to see what a transaction will cost.

Copy or compare

The values are displayed in real time. Select and copy any unit's value to paste into a wallet, smart contract, or block explorer. The conversion is precise to the wei — what you see is what you'd get on-chain.

Ethereum units — why ether splits into 18 decimal places

Bitcoin uses one number of decimals (8, defining the satoshi). Ethereum uses 18. That extra precision sounds extravagant until you realise what Ethereum has to support: not just currency transfers, but smart contracts that can charge fees as small as nanocents, escrow tiny payments per second of streaming media, and price gas in units small enough that even the cheapest transaction needs sub-thousandths of a cent of granularity. The base unit is the wei, named after Wei Dai (the cryptographer whose 1998 b-money proposal influenced Bitcoin's design). One ether equals 10¹⁸ wei — a quintillion. To make those large numbers manageable, the Ethereum community defined seven named units, each named after a cryptography pioneer.

The seven units — and what each is actually used for

wei (10⁰) is the base unit, used internally by the EVM and in smart-contract code. kwei (10³, named after Charles Babbage) and mwei (10⁶, named after Ada Lovelace) are rarely seen in the wild; they're defined for completeness but most tools jump straight to gwei. gwei (10⁹, named after Claude Shannon) is the workhorse — gas prices are universally quoted in gwei. szabo (10¹², named after Nick Szabo, who proposed smart contracts in the 1990s) and finney (10¹⁵, named after Hal Finney, the cypherpunk who received the first Bitcoin transaction from Satoshi) appear occasionally in contract code but are unusual in user interfaces. ether (10¹⁸) is the everyday display unit — what you see in your wallet, on Etherscan, and in any user-facing app.

1 ether = 1,000,000,000,000,000,000 wei. JavaScript's regular Number type loses precision above 2⁵³ ≈ 9 quadrillion. Always use BigInt or a library like ethers.js for ETH math.

Why precision matters — the floating-point trap

JavaScript's standard Number type is IEEE 754 double-precision floating point, which can represent integers exactly only up to about 9 quadrillion (2⁵³). One ether is one quintillion wei — three orders of magnitude beyond Number's exact range. If you naively type 1e18 into JavaScript and do arithmetic on it, you'll get answers off by hundreds or thousands of wei — invisible at the ether scale, catastrophic if you're writing or auditing smart-contract code where one wei matters. This calculator uses BigInt (a JavaScript primitive since 2020) for every conversion. BigInt has no precision limit and produces correct results down to the wei, regardless of how many decimals you type.

The APAC Ethereum landscape

Ethereum adoption across APAC mirrors broader crypto patterns but with distinct national flavours. South Korea is one of the most active retail crypto markets in the world — Upbit and Bithumb regularly hit top-5 global exchange volumes; the "Kimchi premium" (Korean ETH/BTC prices trading above global rates) has been a persistent feature for years. Singapore hosts a huge concentration of Ethereum-native protocols, DAOs, and DeFi infrastructure — its MAS-licensed crypto regime (DPT licences) has made it the regional finance hub. Hong Kong licensed retail crypto trading in 2023 and has actively courted ETH and ETF business. Japan has the world's most developed crypto regulatory framework (FSA-licensed exchanges since 2017) but retail ETH activity is more conservative. India has massive grassroots ETH adoption despite an 18% GST + 30% capital gains tax + 1% TDS on every transaction. Indonesia, Philippines, Vietnam, Thailand are among the highest crypto-adoption-by-population markets globally per Chainalysis 2024 — Ethereum dominates DeFi use cases there. Malaysia, Australia, New Zealand have moderate adoption with established regulatory frameworks. Mainland China banned crypto in 2021 but Ethereum dev activity continues; Hong Kong has effectively become the on-ramp for Chinese capital into ETH-denominated assets. Taiwan has growing DeFi participation. Everywhere in the region, gwei is the unit traders quote, ether is what wallets display, and the wei/gwei/ether translation is something every active crypto user needs to do regularly.

What this tool doesn't do

It doesn't fetch the live ETH price — that would require an external API call, which adds a privacy footprint (the third-party API can log your queries). Type the current price yourself from any source. It doesn't connect to your wallet, sign transactions, or query the blockchain — for that you need ethers.js, viem, or MetaMask. It doesn't convert between ETH and other tokens (USDT, USDC, DAI, BTC, MATIC) — that needs live exchange rate data. This is a pure unit converter — the math layer underneath every wallet, every block explorer, every dApp.

10 Things You Didn't Know About Ethereum Units

01

wei is named after Wei Dai, the cypherpunk cryptographer whose 1998 b-money proposal directly influenced both Bitcoin and Ethereum's design.

02

gwei is named after Claude Shannon, the father of information theory — fitting for the unit used to measure information-processing cost on Ethereum.

03

finney is named after Hal Finney — the cypherpunk who in 2009 received the first Bitcoin transaction ever sent by Satoshi Nakamoto.

04

szabo honours Nick Szabo, who in 1996 proposed "smart contracts" — coining the term Ethereum would later make universal.

05

kwei (Charles Babbage) and mwei (Ada Lovelace) honour the inventors of the world's first general-purpose computer concepts, two centuries ago.

06

The standard ETH transfer costs exactly 21,000 gas units — a hard-coded value in the EVM since Ethereum's launch in 2015.

07

Ethereum's EIP-1559 (Aug 2021) split gas price into "base fee" (burned, removed from circulation) and "priority tip" (paid to validators) — burning 4M+ ETH since.

08

The most expensive single Ethereum transaction ever cost over 23,000 USD in gas fees — paid by a Uniswap user during the May 2021 NFT mint frenzy.

09

South Korea's Upbit consistently ranks in the global top-5 for ETH trading volume — driven by the "Kimchi premium" phenomenon.

10

JavaScript's BigInt — used by this tool — was added in ECMAScript 2020 specifically because the crypto ecosystem demanded arithmetic precision beyond IEEE 754 floats.

FAQ

Exactly 1,000,000,000,000,000,000 (one quintillion = 10¹⁸). 1 ether = 10⁹ gwei = 10¹² szabo = 10¹⁸ wei. The 18 decimal places define Ethereum's smallest indivisible unit.
Because at the wei level, gas prices would be huge unwieldy numbers (25 gwei = 25,000,000,000 wei). gwei is the largest unit at which gas costs naturally read as small integers. "25 gwei" is easier than "0.000000025 ether" or "25,000,000,000 wei".
No. The tool runs entirely in your browser. No wallet connection, no API calls, no blockchain queries. The ETH price field is manual — you paste in the current rate from anywhere you trust. Verify in DevTools → Network.
Auto-fetching the price would mean calling an external API (CoinGecko, Binance, etc.) which logs your IP and could correlate price-checks with your other activity. Manual entry keeps the tool fully privacy-preserving.
Gas price (gwei) is the per-unit cost — what you're willing to pay for each unit of computation. Gas limit (gas units) is the maximum number of units the transaction is allowed to consume. Total cost = gas price × gas used (which is ≤ gas limit).
21,000 is the fixed cost of a plain ETH transfer in the EVM — hardcoded since Ethereum genesis (2015). Every transaction starts at 21k gas; complex contract calls (ERC-20, swaps, NFT mints) add more on top. It's the floor for any transaction.
The Aug 2021 upgrade that changed gas pricing from "bid what you want" to "base fee + priority tip". Base fee is algorithmically set per block based on demand and is BURNED (removed from circulation). The tip goes to the validator. This burning has removed millions of ETH from circulation.
Yes — the same units apply on every EVM-compatible chain: Arbitrum, Optimism, Base, Polygon zkEVM, etc. Each uses wei/gwei/ether the same way. Gas units per operation are similar (21k for transfer, etc) but gas prices on L2s are 10-100× cheaper than mainnet.
JavaScript's regular Number is IEEE 754 double — precise only to 2⁵³ ≈ 9 quadrillion. One ether is 10¹⁸ wei = 1 quintillion, three orders of magnitude beyond. Without BigInt, conversions lose precision at the wei level. BigInt (ES2020) has no upper limit and produces exact results.
No — this tool converts only between Ethereum's internal units. Cross-token conversion needs live exchange rates. For that, use CoinGecko, Coinbase, or your wallet's swap interface. We may add a USDC/USDT mode later if there's demand.

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