How many Wei are in one Ether?

One Ether equals 1,000,000,000,000,000,000 Wei, or 10^18 Wei.

How many Wei are in one Gwei?

One Gwei equals 1,000,000,000 Wei, or 10^9 Wei.

Is the gas result live?

No. It multiplies the gas limit and gas price you enter and makes no network request.

Can large values lose precision?

The calculator uses strings and BigInt rather than floating-point arithmetic, so supported decimal shifts remain exact.

Ethereum Unit Converter & Gas Cost Calculator

Convert Wei, Gwei, Ether, custom token units, and user-supplied gas costs with exact browser-local arithmetic.

Exact local calculation

Values stay in this browser. This tool does not fetch gas prices, token prices, balances, or USD values.

Ethereum units

Custom token units

Gas cost

Amount

From unit

Ether (10¹⁸)

To unit

Wei (10⁰)

Exact result

Exact Ethereum unit conversion

Ethereum amounts are integer Wei values underneath. This converter shifts decimal places with strings and BigInt, so very large values do not lose precision. The gas tab multiplies only the gas limit and gas price you provide.

Web3 inspection guides

How to Read EIP-712 Typed Data Before You Sign How to Decode EVM Calldata and Spot Token Approvals How Solana Transactions Are Structured: Legacy vs Versioned

How to use this Wei converter

Choose Ethereum units, custom token units, or user-supplied gas cost.
Enter the amount and unit or decimals required by that mode.
Convert, review any truncation warning, and copy the exact result.

What this result does not prove

The tool does not fetch a live gas price, exchange rate, token metadata, balance, or chain state. A gas-limit multiplication is a deterministic arithmetic result, not a promise of the final transaction fee.

Related Web3 tools

Crypto Address Validator Lamports to SOL Converter

Frequently asked questions

How many Wei are in one Ether?: One Ether equals 1,000,000,000,000,000,000 Wei, or 10^18 Wei.
How many Wei are in one Gwei?: One Gwei equals 1,000,000,000 Wei, or 10^9 Wei.
Is the gas result live?: No. It multiplies the gas limit and gas price you enter and makes no network request.
Can large values lose precision?: The calculator uses strings and BigInt rather than floating-point arithmetic, so supported decimal shifts remain exact.