unit-conversion

Development

Convert between Wei, Ether, Gwei, and other Ethereum denominations with Nethereum. Use when the user needs to convert ETH units, handle token decimals, or work with BigDecimal precision for large values.

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Unit Conversion

NuGet: Nethereum.Util (included in Nethereum.Web3)

Source: tests/Nethereum.ABI.UnitTests/UtilDocExampleTests.cs

Wei to Ether and Back

using System.Numerics;
using Nethereum.Util;

var convert = UnitConversion.Convert;

// Ether to Wei
var oneEtherInWei = convert.ToWei(1, UnitConversion.EthUnit.Ether);
// Result: 1000000000000000000

// Wei to Ether
var etherValue = convert.FromWei(BigInteger.Parse("1500000000000000000"));
// Result: 1.5m

Gwei Conversion

var convert = UnitConversion.Convert;

// Gwei to Wei (e.g., gas price)
var gweiInWei = convert.ToWei(21, UnitConversion.EthUnit.Gwei);
// Result: 21000000000

// Wei to Gwei
var gweiValue = convert.FromWei(BigInteger.Parse("21000000000"), UnitConversion.EthUnit.Gwei);
// Result: 21m

Other Denominations

var convert = UnitConversion.Convert;

var finneyInWei = convert.ToWei(1, UnitConversion.EthUnit.Finney);
// Result: 1000000000000000

var szaboInWei = convert.ToWei(1, UnitConversion.EthUnit.Szabo);
// Result: 1000000000000

var ketherInWei = convert.ToWei(1, UnitConversion.EthUnit.Kether);
// Result: 1000000000000000000000

Custom Decimals for ERC-20 Tokens

Use integer decimal places instead of EthUnit for tokens with non-18 decimals (e.g., USDC = 6, WBTC = 8).

var convert = UnitConversion.Convert;

// USDC (6 decimals): raw value to human-readable
var usdcValue = convert.FromWei(BigInteger.Parse("1000000"), 6);
// Result: 1m

// Human-readable to raw value
var usdcRaw = convert.ToWei(1m, 6);
// Result: 1000000

BigDecimal Precision

For very large values where decimal would lose precision, use FromWeiToBigDecimal.

var convert = UnitConversion.Convert;
var largeWei = BigInteger.Parse("123456789012345678901234567890");

var bigDecimal = convert.FromWeiToBigDecimal(largeWei, UnitConversion.EthUnit.Ether);

// Round-trip back to Wei without precision loss
var backToWei = convert.ToWei(bigDecimal, UnitConversion.EthUnit.Ether);
// backToWei == largeWei

Denomination Reference Table

Unit	EthUnit Enum	Wei
Wei	`EthUnit.Wei`	1
Gwei	`EthUnit.Gwei`	1,000,000,000
Szabo	`EthUnit.Szabo`	1,000,000,000,000
Finney	`EthUnit.Finney`	1,000,000,000,000,000
Ether	`EthUnit.Ether`	1,000,000,000,000,000,000
Kether	`EthUnit.Kether`	1,000,000,000,000,000,000,000

For custom token decimals, pass an int instead of EthUnit:

USDC/USDT: 6
WBTC: 8
DAI/ETH: 18