Wei / Ether Converter
Convert between Wei, Gwei, Finney, and Ether with full BigInt precision. No floating point errors.
ETH Unit Converter
Convert between Wei, Gwei, Finney, and Ether with full BigInt precision — no floating point errors.
1 Ether = 1018 Wei = 109 Gwei
1 Gwei = 109 Wei
1 Finney = 1015 Wei (milliether)
What are Ether denominations?
Ether is divisible into smaller units, similar to how a euro divides into cents. The smallest unit is Wei: 1 Ether equals 10^18 Wei. Gwei (10^9 Wei) is the unit most commonly used for gas prices, while Finney (10^15 Wei) and Szabo (10^12 Wei) appear less often in modern tooling.
Because these conversions span 18 orders of magnitude, floating-point arithmetic can silently lose precision. This converter uses BigInt throughout, so every result is exact — no rounding errors even for very large values.
Features
- Convert between Wei, Gwei, Szabo, Finney, and Ether
- Exact BigInt arithmetic — no floating-point drift
- Accepts arbitrarily large values
- Instant, bidirectional conversion as you type
- 100% client-side — nothing is sent to a server
When to use it
Use it when reading gas prices reported in Gwei, checking a transaction value shown in Wei on a block explorer, writing amounts into Solidity contracts, or reconciling token balances that use different decimal places.