Wei is the smallest, indivisible unit of Ether and the unit the Ethereum protocol uses internally. One ETH equals 10^18 wei (a quintillion). Because all on-chain balances and amounts are tracked in wei, it is the base from which every other denomination is derived.

What is gwei and why does it matter?

Gwei equals 1,000,000,000 wei (10^9), or 0.000000001 ETH. It is the standard unit for quoting Ethereum gas prices, so when you see a gas price like "25 gwei" it means each unit of gas costs 25 billion wei. Gwei keeps gas figures readable without long strings of zeros.

What are szabo and finney?

Szabo and finney are larger sub-units of Ether named after cryptography pioneers Nick Szabo and Hal Finney. One szabo is 10^12 wei (one millionth of an ETH) and one finney is 10^15 wei (one thousandth of an ETH). They are less common today but still part of Ethereum's denomination ladder.

Why does converting a small amount of wei to ETH show 0?

The converter uses exact BigInt integer arithmetic and divides into the target unit, which truncates any remainder. An amount of wei smaller than one whole ETH has no whole-ETH part, so it rounds down to 0. To see the fractional value, convert to a smaller unit such as gwei or wei instead.

Why use BigInt instead of normal numbers?

Ethereum amounts reach 10^18 wei for a single ETH, far beyond the range where JavaScript's floating-point numbers stay exact. Standard numbers would silently lose precision at that scale, so the tool uses BigInt integer math to keep conversions exact and avoid rounding errors.

How accurate is the USD value?

The USD figure multiplies the converted ETH amount by the price you enter in the optional field. The tool does not fetch live prices, so it is only as accurate as the number you supply. Use it as a rough estimate, not a real-time market quote or financial advice.

Does my data leave the browser?

No. All unit conversions and the optional USD multiplication run locally in your browser. Nothing you enter is sent to a server, and no market or network request is made during conversion.

Crypto Tools

Gwei to ETH Converter — Wei, Kwei, Mwei, Gwei, Szabo, Finney, ETH

🔒 Runs in your browser

Convert Ethereum amounts between wei, kwei, mwei, gwei, szabo, finney, and ETH. Enter any amount in any unit and all others update instantly. Optionally add an ETH price for USD conversion. No network request — all calculations happen in your browser using exact BigInt arithmetic.

How to use this tool

Enter an amount and select the source unit (wei, gwei, ETH, etc.).
Select the target unit — all values update instantly using exact BigInt arithmetic.
Optionally enter an ETH price to see the USD equivalent.

Amount

From

Result

ETH

ETH Price (USD, optional)

About ETH Unit Converter

The Ethereum Unit Converter translates an amount between the named denominations of Ether: wei, kwei, mwei, gwei, szabo, finney, and ETH. Enter a whole-number amount, choose the source unit, pick a target unit, and the converted value appears instantly with a Copy button. An optional ETH price field lets you see an approximate USD value using a price you supply.

The units form a fixed power-of-ten ladder anchored on wei, the smallest indivisible unit of Ether. One ETH equals 1,000,000,000,000,000,000 wei (10^18). Along the way, kwei is 10^3 wei, mwei is 10^6, gwei is 10^9, szabo is 10^12, and finney is 10^15. Gwei is the unit you see most often because Ethereum gas prices are quoted in gwei. To avoid the precision loss that ordinary JavaScript numbers suffer at these magnitudes, the conversion uses exact BigInt integer arithmetic: the amount is converted to wei and then divided into the target unit.

This makes the tool well suited to reading raw on-chain values, which are stored in wei, and to working with gas estimates expressed in gwei. It is a quick reference for developers checking contract values, for anyone interpreting a transaction's raw amount, and for converting a gas price into its ETH cost.

There is one important behavior to keep in mind: because the converter uses integer arithmetic, dividing into a larger unit truncates any remainder rather than showing a fraction. Converting from a smaller unit up to a larger one only yields a whole-unit result, so an amount of wei that is less than one whole ETH will convert to 0 ETH, and partial gwei or szabo are likewise dropped. For exact fractional results, convert to the smaller unit instead, where the full value is preserved as a whole number of those units. The USD value is only as accurate as the price you enter, since no market data is fetched, and because it depends on that truncated conversion it should be read as a rough estimate rather than financial advice or a precise figure. All calculations run locally in your browser, so the amounts and price you enter are never uploaded.

Frequently Asked Questions

What is wei?: Wei is the smallest, indivisible unit of Ether and the unit the Ethereum protocol uses internally. One ETH equals 10^18 wei (a quintillion). Because all on-chain balances and amounts are tracked in wei, it is the base from which every other denomination is derived.
What is gwei and why does it matter?: Gwei equals 1,000,000,000 wei (10^9), or 0.000000001 ETH. It is the standard unit for quoting Ethereum gas prices, so when you see a gas price like "25 gwei" it means each unit of gas costs 25 billion wei. Gwei keeps gas figures readable without long strings of zeros.
What are szabo and finney?: Szabo and finney are larger sub-units of Ether named after cryptography pioneers Nick Szabo and Hal Finney. One szabo is 10^12 wei (one millionth of an ETH) and one finney is 10^15 wei (one thousandth of an ETH). They are less common today but still part of Ethereum's denomination ladder.
Why does converting a small amount of wei to ETH show 0?: The converter uses exact BigInt integer arithmetic and divides into the target unit, which truncates any remainder. An amount of wei smaller than one whole ETH has no whole-ETH part, so it rounds down to 0. To see the fractional value, convert to a smaller unit such as gwei or wei instead.
Why use BigInt instead of normal numbers?: Ethereum amounts reach 10^18 wei for a single ETH, far beyond the range where JavaScript's floating-point numbers stay exact. Standard numbers would silently lose precision at that scale, so the tool uses BigInt integer math to keep conversions exact and avoid rounding errors.
How accurate is the USD value?: The USD figure multiplies the converted ETH amount by the price you enter in the optional field. The tool does not fetch live prices, so it is only as accurate as the number you supply. Use it as a rough estimate, not a real-time market quote or financial advice.
Does my data leave the browser?: No. All unit conversions and the optional USD multiplication run locally in your browser. Nothing you enter is sent to a server, and no market or network request is made during conversion.

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